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3 years ago

What A moving object always has energy in its

Physics

1 answer:

elena-14-01-66 [18.8K]3 years ago

8 0

The answer is a cell I think hope it helps sorry if wrong

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If enough heat was REMOVED from B, it would change into ____________.

Sindrei [870]

It would change into a gas.

5 0

3 years ago

A power cycle operates between hot and cold reservoirs at 1200 K and 300 K, respectively. At steady state the cycle develops a p

GenaCL600 [577]

Answer:

Explanation:

a ) Thermal efficiency = work output / heat input

= .38 MW / 1 MW = .38

OR 38%

Heat rejected at cold reservoir = heat input - work output

1 MW - .38 MW

= 0.62 MW.

b ) For reversible power output

efficiency = T₂ - T₁ / T₂ ; T₂ is temperature of hot reservoir and T₁ is temperature of cold reservoir.

= 1200 - 300 / 1200 = 900 / 1200

= .75

or 75%

rate at which heat is rejected

= 1 - .75 x 1

= .25 MW .

7 0

3 years ago

This is the last question that I need help with, and I'll try and do the rest on my own. Thank you to all of the tutors that hel

ivann1987 [24]

Question 7.

Given:

Mass, m = 2200 kg

Time, t = 8 s

Velocity = 12 m/s

Let's find the average net force required to stop the car.

To find the average net force required to stop the car, let's first find the acceleration of the car.

$v=v_o+at$

Where:

Initial velocity, vo = 12 m/s

Final velocity, v = 0 m/s (velocity of car when it stops)

t is the time = 8 seconds

a is the acceleration.

Rewrite the formula for a:

$a=\frac{v-v_o}{t}$

Hence, we have:

$\begin{gathered} a=\frac{0-12}{8} \\ \\ a=\frac{-12}{8} \\ \\ a=-1.5m/s^2 \end{gathered}$

The acceleration is -1.5 m/s² (negative because the car is deccelerating).

Now, to find the net force, we have:

$\sum ^{}_{}F=ma$

Where:

m is the mass = 2200 kg

a is the acceleration = -1.5 m/s²

Hence, we have:

$\sum ^{}_{}F=2200\times(-1.5)=-3300\text{ N}$

The negative sign indicates that the force acts in the opposite direction the car is travelling.

Therefore, average net force required to stop the car is 3300 Newtons in the opposite direction.

ANSWER:

3300 N in the opposite direction

8 0

1 year ago

Which of the following is a characteristic of elements

Marizza181 [45]

Answer:

Explanation:

They are the BASE elements. Cannot make them any simpler.

3 0

3 years ago

A Ferris wheel with 60 spokes has a diameter of 100 m. It makes one rotation every 60 seconds. Find the speed of the passengers

Evgesh-ka [11]

Answer:

v = 5.24 m/s

Explanation:

Given that,

No of spokes of a Ferris wheel = 60

The diameter of a wheel, d = 100 m

Radius, r = 50 m

It makes one rotation every 60 seconds.

We need to find the speed of the passengers when the Ferris wheel is rotating at this rate. Let it is v. It can be calculated as follows :

$v=r\omega\\\\=\dfrac{2\pi r }{T}\\\\=\dfrac{2\pi \times 50 }{60}\\\\v=5.235\ m/s$

v = 5.24 m/s

So, the speed of the passengers is 5.24 m/s. Hence, the correct option is (A).

8 0

3 years ago