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3 years ago

What is equilibrium?

Physics

2 answers:

VARVARA [1.3K]3 years ago

8 0

Answer:

when all forces acting on an object remain the same

meriva3 years ago

6 0

None of the choices is correct.

Equilibrium is the condition when all forces acting on an object are balanced. Then, the object doesn't accelerate. It continues in constant, uniform motion. It moves at a constant speed (which may be zero), and in a straight line.

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An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temper

bixtya [17]

Answer:

a. $P=18.61\ W$

b. $\eta_c=0.6976=69.76\%$

c. $\eta=0.4718=47.18\%$

Explanation:

Given:

temperature of the hotter reservoir, $T_H=1250\ K$

temperature of the colder reservoir, $T_C=378\ K$

heat absorbed by the engine, $Q_H=1.42\times 10^{5}\ J$

heat rejected to the cold reservoir, $Q_L=7.5\times 10^4\ J$

time duration of the energy transfer, $t=1\ hr=3600\ s$

<u>Now the work done by the engine:</u>

Using energy conservation,

$W=Q_H-Q_L$

$W=14.2\times 10^4-7.5\times 10^4$

$W=6.7\times 10^4\ J$

<u>Hence the power output:</u>

$P=\frac{W}{t}$

$P=\frac{6.7\times 10^4}{3600}$

$P=18.61\ W$

$\eta_c=1-\frac{T_L}{T_H}$

$\eta_c=1-\frac{378}{1250}$

$\eta_c=0.6976=69.76\%$

now actual efficiency:

$\eta=\frac{W}{Q_H}$

$\eta=\frac{6.7\times 10^4}{1.42\times 10^{5}}$

$\eta=0.4718=47.18\%$

6 0

4 years ago

If a 3-kg object has a momentum of 33 kg·m/s, what's its velocity?

kramer

Its velocity is 11 m/s.

5 0

4 years ago

Hey guys please help ✋✋

Lemur [1.5K]

Answer:

by using mearsung scale

6 0

3 years ago

Removing the radiator cap is advisable as it will help release steam and cool an overheated engine quicker.

stepan [7]

Answer:

False.

Explanation:

Removing the radiator cap will harm you. If the engine is hot and you open the radiator cap then it will cause the liquid boil, pushing the coolant out of the radiator and spraying around the liquid which can harm the person who is opening that cap. So you should aware of the risk and be prepared to avoid danger.

5 0

4 years ago

1. Explain what it means when we say a substance is magnetic. (HINT: Be sure to mention the role of the Electrons)

timurjin [86]

The electrons are in the electron cloud the different field will either wanna connect or not

8 0

3 years ago