Physics College

## Answers

**Answer 1**

The **acceleration **of the **system **is 4.9m/s² in the given **pulley**.

In a pulley, is acceleration equal?

The most massive object will **accelerate downhill **and the least massive object will accelerate upward in a circ*mstance like this where two objects are strung above a **pulley**. Each object will experience the same amount of **acceleration**.

Acceleration has nothing to do with modifying the speed of an object. An object is not accelerating if its **velocity **remains unchanged. The data to the right show that an object moving towards the north does accelerate. The object's velocity is **fluctuating **over time.

In reality, the velocity changes by 10 m/s, or a **constant amount**, every second. An object is said to be moving faster or to have an acceleration whenever its velocity is changing.

ma = mg × sin30

a = g × sin30

a = 9.8 × sin30

a = 4.9m/s²

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## Related Questions

Calculate the frequency in hertz of electromagnetic radiation that has a wavelength of 536.0 nm. (c = 3.00 X 10⁸ m/s)

### Answers

The frequency of **electromagnetic radiation** with a wavelength of 536.0 nm is 5.6 x 10¹¹ Hz.

What is **electromagnetic radiation**?

Electromagnetic radiation is a form of energy that consists of waves of electric and **magnetic fields**, travelling through the air or other substances at the speed of light. These waves are created when an electric charge is accelerated and can be generated from a variety of sources, such as a light bulb, the sun, a microwave oven, or a radio transmitter.

The frequency (f) of electromagnetic radiation is calculated using the equation:

f = c/λ

where c is the speed of light (3.00 x 10⁸ m/s) and λ is the wavelength of the radiation (536.0 nm).

Therefore, we can calculate the frequency (f) as follows:

f = (3.00 x 10⁸ m/s) / (536.0 nm)

First, we need to convert the **wavelength from nanometers** (nm) to meters (m). We can do this by dividing 536.0 nm by 1,000,000 to get 0.000536 m.

Therefore, we can calculate the frequency (f) as follows:

f = (3.00 x 10⁸ m/s) / (0.000536 m)

f = 5.6 x 10¹¹ Hz

The frequency of electromagnetic radiation with a wavelength of 536.0 nm is 5.6 x 10¹¹ Hz.

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calculate the theoretical density of ge assume ge has the diamond cubic structure the atomic radius is 1.225 a and the atomic mass is 72.59 use avo

### Answers

According to the problem This gives us a theoretical **density** of 6.1 g/cm^3.

What is theoretical density?

Theoretical density is a calculation of the **maximum** amount of matter that a substance is able to contain in a specific amount of space, usually expressed in terms of grams per cubic centimeter.

The density of a material can be determined using Avogadro's number, which is[tex]6.02 x 10^23[/tex]mol^-1. The atomic mass of Ge is 72.59 g/mol, and the atomic radius of Ge is 1.225 Å.

To calculate the density, we must first calculate the volume of a single Ge atom. This can be done using the atomic radius, which gives us a volume of[tex]7.23 x 10^-23 cm^3.[/tex]

Next, we can calculate the number of atoms per unit volume by dividing Avogadro's number by the volume of a single atom. This gives us[tex]8.38 x[/tex][tex]1[/tex][tex]0^22 atoms/cm^3.[/tex]

Finally, we can calculate the density by **multiplying** the number of atoms per unit volume by the atomic mass. This gives us a theoretical density of 6.1 g/cm^3.

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rectangular plate is supported by three cables as shown. knowing that the tension in cable ac is 60 n, determine the weight of the plate.

### Answers

The weight of the **plate** is equal to -(60 × LAC)/LAB - 60.

What is **plate**?

Plate is a flat dish used for serving food. It is usually made of ceramic, glass, metal, or plastic, and is sometimes **decorated **with patterns or designs. Plates are usually round, but can also be rectangular, square, or oval. They are used for a variety of meals, from casual to formal.

Using the principle of **static equilibrium**, we can set up a system of equations to solve for the weight of the plate.

Equilibrium in the vertical direction:

Weight of the plate + Tension in cable AB + Tension in cable AC = 0

W + TAB + TAC = 0

Equilibrium in the **horizontal direction**:

Moment created by the tension in cable AB + Moment created by the tension in cable AC = 0

TAB × LAB + TAC × LAC = 0

Where W is the weight of the plate, TAB is the tension in cable AB, TAC is the tension in cable AC, LAB is the length of cable AB, and LAC is the length of cable AC.

We know that the tension in cable AC is 60 N, so we can substitute that into the equations above:

W + TAB + 60 = 0

TAB × LAB + 60 × LAC = 0

We can now solve for the weight of the plate by solving the **system **of equations.

Substituting the second equation into the first equation:

W + TAB + 60 = 0

W + (60 × LAC)/LAB + 60 = 0

W = -(60 × LAC)/LAB - 60

Therefore, the weight of the plate is equal to -(60 × LAC)/LAB - 60.

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Economics affects nearly everything we do in some way. Someone else has produced most items we consume, or use, in our daily lives, from food to clothes to music to gas for our cars. Chances are, when we purchase these daily items, we don't question the price with the producer. But in the United States, the interactions between the consumers and producers determine quite a lot in terms of business and economics.

Think about the items and services that you and your family buy or consume. What causes you to pay the prices that you do for these goods and services? What determines the price that's on the price tag? What goes into determining, or setting, that price? Consider all the possible elements that could influence the prices you pay.

### Answers

We **consume** a variety of goods and services, including groceries, toothpaste,** internet access**, cars and **gas, fruits, **and many more. They are likely to purchase an item if the** price is low **and it appears to be what they need or want.

**Describe the relationship between a consumer and a producer.**

People are **producers **when they create products and services—**goods **and services, goods and services, goods and services. They are **consumers** when they use the products that have been produced, the products that have been produced, the products that have been produced.

We pay costs for these **products **since we use them constantly and we need them in our daily life. We purchase **groceries** and fruits because we must eat food. Usually, the price of a thing is determined by the demand for it. Then, you can consider **market competition**, inflation rates, the standard of the goods, where they are available, how much it costs to produce them, as well as numerous government regulations and taxes.

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Determine the number of cubic feet of air per minute required to cook a room having a sensible heat gain of 4500 btu per hour to a temperature of 78 F dry bulb, if the air enters the room at a temperature of 63 F and the outside temperature is 93F

### Answers

It is given that, the** heat **gained is 4500 btu per hour. The** temperature** difference here is 30 F and the **specific heat **of air is 0.24 btu/lb°F. Then the cubic feet of air per minute is 138.8 CFM.

What is sensible heat transfer ?

The **sensible heat transfer** in a system can be calculated using the equation below:

q = CFM × 1.08 ×ΔT

q = CFM x 0.075 lb/ft3 x 60 min/hour x 0.24 btu/lb°F x ∆T

where, 0.24 btu/lb°F is the **specific heat** of the dry air.

Given that q = 4500 btu/hour.

**temperature difference **= 93 F - 63 F.

Then 4500 btu/hr = CFM × 1.08 × 30 F

**CFM** of** air** = 4500 btu/hr /(1.08 × 30 F ) = 138.8 CFM.

There for the number of **cubic feat** of air per minute is 138.8.

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I’m not sure what the answers to these questions are for this sheet can u help?

### Answers

**Answer:**

**Explanation:**

b. helmet is aerodynamic; and he is leaning down, which reduces his surface area

c. open parachute exposes more surface area to the air, which increases the drag

9. A and D will float because density is less than 1.0

When he pushes the object down, then lets it go, it bobs back up because of the upward force (upthrust) of the water acting on the object.

Which type of spectrum can we use to determine the chemical composition of

interstellar gas clouds?

### Answers

In the electromagnetic **spectrum**, EM **radiation **includes radio waves, visible light, and gamma rays.

**What is a spectrum?**

The characteristic wavelengths of electromagnetic **radiation **(or a subset thereof) emitted or absorbed by a material, atom, or molecule are called spectra. A **spectrum **is a state that can vary continuously along a continuum and is not limited to a set of values. After passing through a prism, visible light takes on a rainbow of colors, as the term was originally used scientifically in optics.

We study the electromagnetic **radiation**, or EM radiation, that interstellar clouds emit and receive from them. The range of this EM **radiation **includes radio waves, visible light and gamma rays in the electromagnetic **spectrum**.

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A student sees a mirror image of a tree in a pond on a very still day. The student is able to see a mirror image of the tree in the pond because light

striking the surface of the water -

bends downward.

bounces off.

becomes brighter.

is absorbed.

### Answers

**Answer:**

**B.**

**Explanation:**

What causes a reflection in still water?

Reflection in water is caused when light hits the surface of still water and travels to our eye so we can see the complete image and light it's reflecting.

All materials reflect light in some way.

Hope it helped!

A worker pushes horizontally on a large crate with a force of 235 N, and the crate is moved 3.3 m. How much work was done?

### Answers

**Answer:**

**Explanation:**

The work done by a force on an object is equal to the product of the magnitude of the force, the distance moved by the object in the direction of the force, and the cosine of the angle between the force and the direction of motion.

In this case, the worker pushes the crate horizontally, so the force and the direction of motion are in the same direction. Therefore, the angle between them is 0 degrees, and the cosine of the angle is 1.

The work done by the worker on the crate is then:

work = force x distance x cos(angle)

= 235 N x 3.3 m x cos(0)

= 773.5 J

So the work done by the worker is 773.5 Joules (J).

Hello,

**Answer:**

The work done by a force on an object is given by:

Work = Force x Distance x cos(theta)

where Force is the magnitude of the force applied, Distance is the displacement of the object, and theta is the angle between the force and displacement vectors. Since the worker is pushing horizontally on the crate, the angle between the force and displacement vectors is zero degrees, and cos(0) = 1.

So, the work done by the worker is:

Work = Force x Distance x cos(theta)

Work = 235 N x 3.3 m x cos(0)

Work = 773.5 J

Therefore, the work done by the worker on the crate is 773.5 J.

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Oil molecules are non polar. How will a stream of oil react near a positively charged comb?

Lo

### Answers

the stream will bend toward the comb.

An object is 20 cm in front of a diverging lens with a focal length of 10 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted? Is it real or virtual?

### Answers

The **location** of the image (object is 20 cm in front of a diverging lens with a focal length of 10 cm = 6.66 cm. The image created by a **diverging** lens:

Image reduction

Image is vertical

The image is virtual.

Additionally known as a **dispersive** lens, negative lens, divergent lens, or concave lens. A lens that creates parallel light beams that spread out and veer away from the optical axis after leaving the lens.

The equation:

1/f = 1/v - 1/u

Where,

f = focal length

v = image distance

u = the object distance

Hence,

1/v = - ⅒ - 1/20

= -2/20 - 1/20

v = 6.66 cm

The **image** created by a diverging lens

Image reduction

Image is vertical

The image is **virtual**.

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A person stands on a scale in an elevator. The maximum and minimum scale readings are 908.9 N and 494.7 N, respectively. The acceleration of gravity is 9.8 m/s 2 . Assume the magnitude of the acceleration is the same during starting and stopping, and determine the acceleration of the elevator. Answer in units of m/s 2 .

### Answers

The **acceleration** of the elevator is 9.8 m/s^2, which is equal to the acceleration due to gravity.

The change in the person's weight can be used to calculate the elevator's acceleration.

The change in** weight **is: 908.9 N - 494.7 N = 414.2 N

Since weight is equal to mass times acceleration (W = m * a), we can rearrange the equation to solve for acceleration:

a = W / m

Where m is the mass of the person, which can be calculated using the acceleration due to gravity:

m = W / g = 414.2 N / 9.8 m/s^2 = 42.3 kg

Substituting the** mass **into the equation for acceleration:

a = 414.2 N / 42.3 kg = 9.8 m/s^2

So the acceleration of the elevator is 9.8 m/s^2, which is equal to the acceleration due to gravity.

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80m E 20m S FIND THE AIR SPEED OF THE PLANE RELATIVE TO THE GROUND.

### Answers

The **air speed **of an **airplane** traveling 80 meters east and 20 meters south in a second **relative** to the **ground** is about 82.46 m/s

What is the airspeed of a plane relative to the ground?

The **air speed** of a flying airplane **relative** to (a specified location on) the **ground** is the difference between the airplane's ground speed and the speed of the wind, found using **vectors** as follows;

Mathematically, we get;

Airspeed = Ground Speed - Wind Speed

Whereby the **velocity** of the wind is 120 m/s and the airplane is traveling with an **airspeed** of 300 m/s due east for example, and the **airplane** travels 80 meters east and 20 meters south relative to the ground in one second, we get;

Resultant valocity = 80 m/s East, 20 m/s South

v = 80·**i** - 20·**j**

The magnitude of the velocity of the plane relative to the ground can be found, using the formula for the magnitude of resultant vector as follows;

|v| = √(80² + (-20)²) = 20·√(17) ≈ 82.46

The air speed of the plane relative to the ground is therefore;

|v| ≈ 82.46 m/s

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two waves having the same amplitude and frequency are traveling in the same medium. maximum destructive interference will occur when the phase difference between the waves is

### Answers

If two **waves** having the same amplitude and frequency are traveling in the same medium. maximum destructive interference will occur when the phase **difference** between the waves is **180**⁰.

The resultant **amplitude** of two waves with the same amplitude and frequency that collide while traveling in the same direction depends on the phase difference.

While there is no phase difference between two nodes, there is a 180⁰ **phase** variation between two antinodes.

The formula for the resulting amplitude caused by the superposition of two waves with a phase difference is:

A² = A1² + A2² + 2A1A2 cos ϕ

ϕ = 2π/3

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Calculate the wavelength and the energy in joules associated with an NMR signal at 250 MHz. The wavelength of the signal is 1.2m and the energy is 1.67 x 10-25J?

### Answers

The wavelength of an **NMR **signal at 250 MHz is 1.2m and its energy is 1.67 x 10⁻²⁵ J.

**Nuclear Magnetic Resonance** (NMR) spectroscopy is a widely used technique in physics and chemistry for determining the chemical and physical **properties **of substances. The frequency of an NMR signal is related to the magnetic field strength and the magnetic properties of the nuclei being studied.

The wavelength of an NMR signal can be calculated using the equation:

λ = c/v

where c is the **speed of light** (3 x 10⁸ m/s) and v is the **frequency** of the signal (250 MHz).

λ = c / v

λ = 3 x 10⁸ m/s / (250 x 10⁶ Hz)

**λ = 1.2 m**

The energy of an NMR signal can be calculated using the equation:

E = hv

where h is **Planck's constant **(6.63 x 10⁻³⁴ J s) and v is the **frequency **of the signal.

E = h × v

E = 6.63 x 10⁻³⁴ J s × (250 x 10⁶ Hz)

**E = 1.67 x 10⁻²⁵ J**

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A 117-lb student races up stairs with a vertical height of 5.7 m in 5.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?

### Answers

Work = (117 lbs) * (1 kg / 2.2046 lbs) * (9.81 m/s^2) * (5.7 m) = 296.8 J where 1 lb = 0.4536 kg. The time it takes for the student to climb the stairs he takes 5.5 seconds, so:

Power = **work done** / time taken = 296.8 J / 5.5 seconds ≈ 54 W So the power consumed by the student climbing the stairs is about 54 watts.

**What is Acceleration?**

**Acceleration**, the rate of change of velocity over time for both velocity and direction. A point or object moving in a straight line accelerates as it accelerates or decelerates. **Circumferential **motion is accelerated because it always changes direction even at constant velocity.

**What is example acceleration?**

If an object **accelerates **and moves in a positive direction, you have positive acceleration. The car **accelerating **in the first example is an example of positive acceleration. The car is moving forward and accelerating in the positive direction, so the acceleration is in the same direction as the car is moving.

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A skier starts down a 10 degree incline at 2 m/s, reaching a speed of 15m/s at the bottom. What is the length of the incline?

How long does it take the skier to reach the bottom.

### Answers

**Answer:**

-11.29 m

**Explanation:**

The length of the incline can be calculated using the following formula:

L = (Vf^2 - Vi^2) / (2 * a)

where:

L = length of incline

Vf = final speed (15 m/s)

Vi = initial speed (2 m/s)

a = acceleration due to gravity (9.8 m/s^2 on the surface of the Earth)

Since the skier is going downhill, the acceleration is negative.

Substituting the given values into the formula:

L = (15^2 - 2^2) / (2 * -9.8)

L = (225 - 4) / -19.6

L = 221 / -19.6

L = -11.29 m

So the length of the incline is approximately -11.29 meters. This negative value indicates that the skier's final position is lower than the starting position.

a mass attached to the end of a spring is set in motion. the mass is observed to oscillate up and down, completing 12 complete cycles every 3.00 s.

### Answers

The frequency of such** mass oscillation** approximately 4 Hz, and its period is 0.5 seconds.

A frequency is defined.

The quantity of pulses that pass a set location in a predetermined period of time is known as frequency. Therefore, if a wave passes through in less than a second, the frequencies is 2 per second. The **periodicity** is 100 times per hour if it consumes 1/100 of an hour.

Describe the frequency formula.

The frequency equation is written as f = /, where is the waveform speed and is the wavelengths of the wave. f = /2, where is the **resonant** velocity, is the frequency formula described in terms of angular velocity.

12 complete cycle = 3 sec.

1 complete cycle = 3/12

= 1/4 sec.

mass oscillation, T = 1/2 sec.

= 0.5 sec.

f = 12/3

= 4 Hz

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The equation of a wave traveling in a horizontal direction is expressed as y = 5sin(60t - x)

What's the phase angle

(a)90° (b)180° (c)270° (d)360° (e)0°

### Answers

**Answer:**

**The equation of a transverse wave traveling along a very long string is y=6.0sin(0.020πx+4.0πt), where x and y are expressed in centimeters and t is in seconds. Determine (a) the amplitude, (b) the wavelength, (c) the frequency, (d) the speed, (e) the direction of propagation of the wave, and (f) the maximum transverse speed of a particle in the string. (g) What is the transverse displacement at x=3.5 cm when t=0.26s?/(a) The amplitude is y **

**m**

****

** =6.0 cm.**

**(b) We find λ from 2π/λ=0.020π⋅λ=1.0×10 **

**2**

** cm.**

**(c) Solving 2πf=ω4.0π, we obtain f=2.0 Hz.**

**(d) The wave speed is v=λf=(100 cm)(2.0 Hz)=2.0×10 **

**2**

** cm/.s**

**(e) The wave propagates in the −x direction, since the argument of the trig function is kx+ωt instead of kx−ωt **

**(f) The maximum transverse speed (found from the time derivative of y) is**

**u **

**max**

****

** =2πfy **

**m**

****

** =(4.0πs **

**−1**

** )(6.0 cm)=75 cm/s**

**(g) y(3.5 cm,0.26 s)=(6.0 cm)sin[0.020π(3.5)+4.0π(0.26)]=2.0 cm.**

Part A

A sports car accelerates from rest to 94 km/h in 5.5 s.

What is its average acceleration in m/s².

Express your answer using two significant figures.

V

ΑΣΦ

?

### Answers

**Answer:**

The average acceleration of the sports car is 16.9 m/s².

Part A: How much pressure is needed to compress the volume of an iron block by 0.20% ? Express your answer in N/m2. Use Biron=9.0×10^10 N/m^2.

Express your answer using two significant figures.

Part B: Compare it to atmospheric pressure (1.0×10^5 N/m^2).

Express your answer using two significant figures.

### Answers

The **bulk modulus** of the iron block is given 9 × 10¹⁰ N/m². The volume change is 0.20 %. Then the **pressure** required for the compression is 1.8 × 10⁸ N/m².

What is bulk modulus?

**Bulk modulus** of an object is the measure of its resistance to compression. It is the ratio of infinitesimal increase in **pressure** to the decrease in** volume**.

B = ΔP/ΔV/V

= ΔPV/ΔV.

Given B = 9 × 10¹⁰ N/m²

ΔV/V = 0.20/100 = 0.002

then ΔP = B ΔV/V

ΔP = 9 × 10¹⁰ N/m² × 0.002 = 1.8 × 10⁸ N/m²

**Atmospheric pressure** = 1 × 10⁵ N/m²

then ΔP/Patm = 1.8 × 10⁸ N/m²/1 × 10⁵ N/m² = 1800

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Oil having a density of 930 kg/m^3 floats on water. A rectangular block of wood 4.17 cm high and with a density of 975 kg/m3 floats partly in the oil and partly in the water. The oil completely covers the block. How far below the interface between the two liquids is the bottom of the block?

### Answers

**Answer: 0.0268 m**

**Explanation:**

Draw a free body diagram of the block. There are three forces: weight force mg pulling down, buoyancy of the oil B₁ pushing up, and buoyancy of the water B₂ pushing up.

Sum of forces in the y direction:

∑F = ma

B₁ + B₂ − mg = 0

ρ₁V₁g + ρ₂V₂g − mg = 0

ρ₁V₁ + ρ₂V₂ = m

ρ₁V₁ + ρ₂V₂ = ρV

ρ₁Ah₁ + ρ₂Ah₂ = ρAh

ρ₁h₁ + ρ₂h₂ = ρh

(930 kg/m³)h₁ + (1000 kg/m³)h₂ = (968 kg/m³) (4.93 cm)

Since the block is fully submerged, h₁ + h₂ = 4.93 cm.

(930 kg/m³) (4.93 cm − h₂) + (1000 kg/m³)h₂ = (968 kg/m³) (4.93 cm)

h₂ = 2.68 cm

h₂ = 0.0268 m

What are the nature and focal length of a lens that will form a real image having one-third the dimensions of an object located 9cm from the lens

### Answers

A lens that forms a real image one-third the dimensions of an object located 9 cm from the lens is a** diverging lens** with a negative** focal length**.

What are the nature and focal length?

The nature and** focal length** of a lens that will form a real image having one-third the dimensions of an object located 9cm from the lens is determined as follows;

The formula for the **magnification** (m) of an image formed by a lens is given by m = -h' / h,

where;

h is the height of the objecth' is the height of the image.

Given that m = 1/3,

we have h' / h = -1/3

Solving for the **focal length** (f) using the lens formula;

1/f = 1/u + 1/v,

where;

u is the object distancev is the image distance,

f = -3u = -27 cm.

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What is the answer to question which statement correctly describes a characteristic that a scientific measuring tool should have ?

### Answers

To be accurate, a **scientific **measuring instrument needs to be able to provide repeatable observations of a quantity.

How can you be scientific?

of, pertaining to, or showing the scientific concepts or procedures. conducted **scientifically **or in accordance with findings of scientific investigation: by practicing or employing comprehensive or orderly procedures. advertising using science.

Who is referred to as scientific?

A scientist is a person who methodically acquires data and uses it to form hypotheses, test those **assumptions **and further knowledge and understanding. Additional characteristics of a scientist include: their methodology, such as their use of statistics.

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A car takes off at a speed of 45 m/s. How far will the car travel in 77 seconds

### Answers

The **car **will travel 3465 **meter **in 77 seconds s with this uniform **speed**.

What is speed?

**Speed **is distance travelled by the object per unit time. Due to having no direction and only having magnitude, **speed **is a scalar quantity With SI unit meter/second.

Uniform **speed **of the car = 45 m/s

**Time **interval of motion of the car = 77 seconds.

Hence, total **distance **travelled by the car = speed of the car × time interval

= 45 m/s × 77 seconds

= 3465 meter.

Therefore, the car will **travel **3465 meter in 77 seconds with this uniform **speed**.

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The following circuit diagram is partially incomplete. A device is added to the electrical circuit to vary the current in Lamp 2 only. Which of the following circuit symbols should be included in the diagram to represent this device?

### Answers

The device used to vary the **current** in a circuit is a variable resistor. The symbol of a** variable resistor **is option** d**. The symbol with a rectangle and an arrow.

What is a variable resistor ?

A **variable resistor** also called a rheostat is a resistor of which the **electric resistance** value can be adjusted. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element.

When a** variable resistor** is used as a potential divider by using 3 terminals it is called a** potentiometer**.

When only two terminals are used, it functions as a variable resistance and is called a **rheostat**. Electronically controlled variable resistors exist, which can be controlled electronically instead of by mechanical action. These resistors are called digital potentiometers.

Here, the resistance thereby the **current** through the lamp 2 can be varied by placing a resistor. Hence, option **d** is correct.

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The **symbol** used in diagram to represent the **device** is **rheostat**'s symbol.

Correct option is D.

What is electric current?

Electric **current** is defined as the **rate** of flow of **electrons** in a **conductor**. The SI **Unit** of electric current is the **Ampere**.

In given circuit,

A **device** is added to the electrical **circuit** to **vary** the **current** in Lamp 2 only,

Electrical **current** is varied by applying **variable **resistance,

The **device** used to apply variable resistance is **rheostat**, which has symbol of **box** with an arrow through it.

Hence, **rheostat**'s symbol will be used in **diagram** to represent the device.

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The water is flowing through a tapping pipe having diameter 400mm and 200mm at section 1 and 2 respectively. The discharge through the pipe is 0.06m³/sec. The section 1 is. 10m above datum line and section 2 is 6m above datum line. Find the intensity of pressure at section 2 to that if that of section 1 is 420 KN/m².

### Answers

The **intensity of pressure **at section 2 is approximately **345.64 kN/m^2.**

**What is pressure?**

**Pressure** is described as the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

To determine the intensity of **pressure** at section 2, we need to use the equation of continuity and the Bernoulli equation:

we will substitute the values from the **continuity equation** into the **Bernoulli equation** which will give us :

P_1 + 1/2 * p * (Q_1 / A_1)^2 + p * g * h_1 = P_2 + 1/2 * p * (Q_2 / A_2)^2 + p * g * h_2

Substitute all the given values into the equation

Solving for P_2 = 420,000 N/m^2 + 47.06 KN/m^2 - 71.42 KN/m^2 = 345.64 KN/m^2

In conclusion, the intensity of **pressure** at section 2 is approximately 345.64 kN/m^2.

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We once thought that the crisis facing the United States was simply a capitalist economic crisis.weakening national governance capacity internally and draining national soft power externally.

### Answers

The thought is a significant issue facing by **united states**. In the capitalist **economy**, all the sectors are changing to private mode and labors facing competing issues.

What is capitalist economic crisis in US ?

In **capitalist democracies**, there are impossibly high hurdles that prevent the government from opposing **capitalism**. Although the concept of "one person, one vote" gives the impression that everyone has an equal voice, the state is actually a system of institutions that we may influence by casting the proper votes.

Instead, it is wanted to demonstrate that capitalists wield excessive **political power** through both the market and the state, and that this power comes mainly from the productive assets they own.

The wealth of the wealthy, however, has been financialized during the past 40 years. Due to this, they now have more access to **money markets** to leave political areas. Even if this gives capitalists more leverage to evade expropriation demands, I'll conclude on a positive note.

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Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of1. 250 N.

2. 500 N.

3. 1000 N.

4. 0 N.

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Joshua is attracted toward **Earth** by a 500-N **gravitational force**. The Earth is **attracted** toward Joshua with a force of 500 N (2)

The **gravitational attraction** that exists between an individual and the earth is directly **proportional **to the mass of the individual and inversely proportional to the square of the radius of the planet (distance from the person to the center of earth). Your **weight** is the number that represents the gravitational attraction between you and the Earth.

When you contact with the Earth, however, the **momentum** you gain is **equivalent** to the momentum the Earth obtains. Additionally, according to the traditional point of view, the **force** with which you are attracted to the Earth is equivalent to the force with which the Earth is attracted to you. Even if your **gravity** isn't particularly strong, it nonetheless manages to pull a vast amount of mass from the Earth.

Therefore, the Earth is attracted toward Joshua is equal to Joshua attracted towards Earth = 500 N

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which of these would increase if a second traffic light were attached to the first? assume the cables do not change their lengths.(select all that apply)

a.the tension T1

b.The angle of the cable with tension T2

c. The angle of the cable with tension T1

d.tension t2

### Answers

Out of the following statement, a.the tension T1 and d.**tension** t2 would increase if a second **traffic light **were attached to the first.

The addition of a second traffic light** **increases the tension in both cables, when two traffic lights are connected, the cable connected to the first light T1 will increase in tension due to the added **weight** of the second light. The additional weight creates a greater force that must be resisted and so the tension in the** cable** will increase, similarly the cable connected to the second light, T2 will also increase in tension due to the added weight of the first light.

The angle of the cable with tension T2 will also increase due to the additional force created by the tension in T1. This increase is due to the additional** force** created by tension inT1, this increase in tension and angle can be seen in the physical world as the cables connected to the two traffic lights stretch and bend to accommodate the additional** **weight, the increase in tension and **angle** helps to ensure that the two lights stay secure and remain in the proper position.

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