An engine does 18500 J of work and rejects 7810 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir

Answer:

8.87

Explanation:

Answer:

Explanation:

You can use \(Q = mc\Delta T=(550)(4.184)(28.8-12.7)=37049.32\) joule.

Speed of the rock at the bottom of the cliff is 44.3 m/s.

Kinetic energy of the rock at the bottom of the cliff is 4915 J.

Work done by air resistance is -2250 J

Average force exerted by the air on the rock is 11.25 N.

a) The speed of the rock at the bottom of the cliff can be calculated using the equation:

v = √(2gh)

where v = final velocity, g = acceleration due to gravity (9.81 m/s²), and h = height of the cliff (200 m).

Plugging in the values:

v = √(2 x 9.81 x 200) = 44.3 m/s

Therefore, the speed of the rock at the bottom of the cliff is 44.3 m/s.

b) The kinetic energy of the rock at the bottom of the cliff can be calculated using the equation:

KE = (1/2)mv²

where KE = kinetic energy, m = mass of the rock (5 kg), and v = velocity (44.3 m/s).

Plugging in the values:

KE = (1/2) x 5 x (44.3)² = 4915 J

Therefore, the kinetic energy of the rock at the bottom of the cliff is 4915 J.

c) The work done by air resistance can be calculated using the work-energy principle:

Work done by air resistance = KE_initial - KE_final

where KE_initial = initial kinetic energy of the rock, and KE_final = final kinetic energy of the rock (at terminal velocity).

Since the rock was initially at rest, its initial kinetic energy is zero. At terminal velocity, the kinetic energy of the rock is:

KE_final = (1/2)mv_terminal²

where m = mass of the rock (5 kg), and v_terminal = terminal velocity (30 m/s).

Plugging in the values:

KE_final = (1/2) x 5 x (30)² = 2250 J

Therefore, the work done by air resistance is:

Work done by air resistance = 0 - 2250 = -2250 J

The negative sign indicates that the work done by air resistance is in the opposite direction to the motion of the rock.

d) The average force exerted by the air on the rock can be calculated using the equation:

Work done by air resistance = Force x Distance

where Force = average force exerted by air on the rock, and Distance = distance travelled by the rock.

Rearrange the equation to solve for Force:

Force = Work done by air resistance / Distance

Plugging in the values:

Force = -2250 / 200 = -11.25 N

Therefore, the average force exerted by the air on the rock is 11.25 N. The negative sign indicates that the force is in the opposite direction to the motion of the rock.

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Answer:

Component

Explanation:

All circuits have some basic parts, called components. One component is the power source, also called a voltage source. The power source is what pushes the electricity through the circuit.

Answer:

the answer is 100sin45°

Explanation:

F=100N

0=45°

component to the horizontal so we say 90°-45°=45°

magnitude of component =100sin45°

Answer:

A prism is a clear crystal that refracts light

Explanation:

Answer:

Pressure = 320 N/m²

Explanation:

Given the following data;

Force = 8000 Newton

Area = 25 m²

To find the pressure, we would use the following formula;

Pressure = force/area

Substituting into the formula, we have;

Pressure = 8000/25

Pressure = 320 N/m²

when Force (N) is 10.0 Length (m) is 0.60

when Force (N) is 8.0 Length (m) is 0.40

when Force (N) is 4.0 Length (m) is 0.20

when Force (N) is 4.0 Length (m) is 0.20

when Force (N) is 2.0 Length (m) is 0.10

chatgpt

49. To find the length of a pendulum that has a period of 2.3 seconds on the Moon, where the gravitational acceleration (g) is 1.6 N/kg, we can use the formula:

Period (T) = 2π√(Length (L) / g)

Substituting the given values:

2.3 = 2π√(L / 1.6)

To solve for L, we can rearrange the formula:

L = (2.3 / (2π))^2 * 1.6

L ≈ 0.781 meters (or 78.1 centimeters)

So, the pendulum must be approximately 0.781 meters (or 78.1 centimeters) long to have a period of 2.3 seconds on the Moon.

50. Ranking Task:

To rank the pendulums according to their periods, we need to consider both the length and mass of each pendulum.

Ranking from least to greatest period:

1. A: 10 cm long, mass = 0.25 kg

2. C: 20 cm long, mass = 0.25 kg

3. B: 10 cm long, mass = 0.35 kg

There is a tie between pendulums A and C, as they have the same length but different masses.

The rock comes to a complete stop at maximum height, so velocity is zero. Gravity is responsible for the acceleration. As a result, at the top of its path, its velocity is zero and its acceleration is 9.81 m/s2, which is approximately 10 m/s2.

When an object thrown straight upwards gets to the top of its path, Its velocity is zero because it moves opposite to gravity and acceleration is 10 m/s2 , due to the rate of change of velocity of an object with respect to time.

Projectile motion is the movement of an object in which the vertical acceleration is g and the horizontal acceleration is zero. A projectile motion is used to throw a stone into the air. It rises against a deceleration of size g, which slows it down until it reaches the maximum height.

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Answer:

Choice E.

Amplitude: \(20\; {\rm cm}\).

Frequency: \(2\; {\rm Hz}\).

Explanation:

The amplitude of a simple harmonic motion (SHM) is the maximum displacement from equilibrium.

In this question, the equilibrium is in the center of the two extremes. With one extreme at \(x = 10\; {\rm cm}\) and the other at \(x = 50\; {\rm cm}\), the center will be at \((1/2)\, (10 + 50)\; {\rm cm} = 30\; {\rm cm}\).

The maximum displacement will be \((50\; {\rm cm} - 30\; {\rm cm}) = 20\; {\rm cm}\) (or equivalently, \((30\; {\rm cm} - 10\; {\rm cm}) = 20\; {\rm cm}\).

Frequency measures the number of cycles completed in unit time (e.g., one second.) In one full cycle of an SHM, the oscillator will travel from one extreme to another and then back to the original extreme. In this question:

In other words, one full cycle of this SHM will take \(0.25\; {\rm s} + 0.25\; {\rm s} = 0.50\; {\rm s}\). The period of this SHM will be \(0.50\; {\rm s}\). Hence, the frequency of this SHM will be:

\(\begin{aligned} (\text{frequency}) &= \frac{1}{(\text{period})} \\ &= \frac{1}{0.50\; {\rm s}} \\ &= 2\; {\rm Hz}\end{aligned}\).

Answer:

The rescue workers can get energy to the batteries in their equipment during rescue missions by using a generator to convert the kinetic energy to potential energy. Potential energy is then stored in the battery.

Explanation:

Answer:

92.16J

Explanation:

E = ½ke²

E = ½(800)(0.48)²

E = 400 x 0.48²

E = 92.16

We have the next information

T=2.00 x 10^-1 s=0.2s

r=3.5 inch

For the angular speed

where omega is the angular speed, T is the period

We substitute

For the linear speed on the rim of the disc, we will use the next formula

in this case r= 3.5/2=1.75 inch

Then for the linear speed on the point at 0.750 inches from the center of the disk.

ANSWER

ω=31.41 rad/sec

v on the rim= 54.97 inches/sec

v on the point=23.56 inches/sec

A hiker approaches a region with many enormous, mature trees and just a variety of other mature bushes and plants. The ecosystem is best describe by the "climax community."

In ecology, the term "climax" refers to the last stage that biotic succession that a plant community can reach in a region depending on the environmental factors in place at the time.

A hiker approaches a region with many enormous, mature trees and just a variety of other mature bushes and plants.

Thus, this ecosystem is best describe by the "climax community."

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The correct question is-

A hiker enters an area where there are large mature trees and a diverse population of other mature plants and shrubs.

Which statement best describes this ecosystem?

It is a climax community.

It is populated with pioneer plants.,

It features many opportunists.,

Answer: c

Explanation:

Answer:

Increase the amplitude

Explanation:

The energy conveyed by a wave is directly proportional to the square of its amplitude. Thus; E ∝ A²

This means that increasing the amplitude will lead to an increase in the energy.

Now, the amplitude of a wave is the height of a wave from it's highest point known as the peak, to the lowest point on the wave known as the trough whereas wavelength refers to the length of a wave from one peak to the next.

This means that increasing the amplitude has no effect on the wavelength.

Answer: take less time to go the same distance

Explanation:

Because if it is going faster let’s say mph 60 mph is 60 miles per hour if you are going 40 miles per hour it will take you longer to get to your destination.

b you should know this no need to explain if you dont know well I'm sorry its b

The average velocity of the travelling circus van is 12.64km/h.

As we already know, the directions east[E] and west[W] are opposite to each other, north[N] perpendicular to both of them.

We know, average velocity V,

V = total displacement/total time taken

Let us assume the situation on a coordinate plane, and say that the van started from origin,

The circus van first goes to the east direction and travels 50Km. After that, it travels 40Km back,

So, he travels straight 50Km and then return back 40Km, so now, his current position is 10Km in the east direction,

Now, from the point in 10km east, he travels 30km north,

Now, his current and final position is 10km east and 30km north,

His initial position was 0km in east and 0km in north,

So, his total displacement D is,

D² = (10)²+(30)²

D² = 100+900

D² = 1000

D = 10√10 Km.

Total time T taken by him is,

T = 1+1+.05

T = 2.5 hours,

Putting the values, the average velocity V is,

V = D/T

V = 10√10/2.5

V= 12.64 km/h

So, the average velocity is 12.64km/h.

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Answer:

V = f * λ        Velocity = frequency * wavelength

λ = V / f = 128 m/s / 256 / s= .5 m       is the wavelength

There will be nodes at o, λ/2, λ, 3λ/2      or at intervals of λ/2

The distance between nodes is ".25 m"

Answer:

Fc = m v^2 / R     horizontal force required to keep ball in circle

Fv = m g       vertical force on ball due to weight

tan θ = Fc / Fv = v^2 / (R * g)       angle from verticle

Circumference of circle = 2 π R

v = 4 π R        distance traveled / sec

v^2 = 16 π^2 R^2

tan θ = 16 π^2 R / g

tan θ = 16 *  π^2 * .3 / 9.80 = 4.83

θ = 78.3 deg from vertical

Answer:

The reason is to allow the thermometer to respond relatively quickly, and relatively accurately. The glass contains the liquid being used in the thermometer, but if it is too thick, then it will not pass heat as quickly, and it will absorb some of the heat from whatever is being measured.

Explanation:

˙˚ʚ(´◡`)ɞ˚˙

The Law of Demand states that price and quantity move in opposite directions.

According to the Law of Demand, there is an indirect correlation between a good or service's price and the amount of that good or service that customers are willing and able to purchase. In other words, consumers are less able and willing to purchase an item as its price rises and vice versa.

This connection between a product's price and demand for it in terms of quantity is captured by the Law of Demand. It asserts that the price of a good and the amount desired are negatively) relate

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Answer:

Distance - 1000m

Time - 20min

Speed - ?

Use the formula of distance ÷ time = speed.

s = d/t

s = 1000m/20min

s = 50 m/min

Hope this helps, thank you !!

1,000 homes when it's spinning.

No homes when it's not spinning.

The number of homes that the wind turbine can carry is 1000 homes

Power is the ratio of work done by an object with respect to time. The unit of power is in Watts (W).

Given the average electrical power usage of an American home to be 2 kW

Since 1kW = 100W

Average power per American home = 2000W = 2 * 10³Watts

Average power of a turbine = 2MW = 2 * 10⁶Watts

Number of homes that the wind turbine can carry = \(\dfrac{2 \times 10^6}{2 \times 10^3}\)

Number of homes that the wind turbine can carry = \(\dfrac{10^6}{10^3}\)

This shows that the number of homes that the wind turbine can carry is 1000 homes

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Answer:

This question is incomplete

Explanation:

This question is incomplete. However, what is described in the question is known as upthrust. Upthrust is an upward force on an object (in this case the wooden block) provided by the liquid (water) as a result of it displacing some of the liquid. Thus floating objects will normally displace some part of the liquid; making some part of it to be submerged in water.

The percentage of the submerged wooden block can be calculated as

length (in height) of the wood block submerged in water/total length (in height) of the wood × 100

Answer:

The temperature when the resistance is 9.61 ohms is -17.3°C. The resistance of the wire when the temperature is 45°C is 11.45 ohms.

Explanation:

Answer:

Explanation:

m