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3 years ago

If we wanted to increase the internal energy of the system by 10 J, we could...

Physics

1 answer:

bazaltina [42]3 years ago

5 0

Answer:

A. Add 30 J by heating the system and have the system do 20 J of work.

Explanation:

The equation for internal energy is $\Delta U=Q+W$ , where here Q is the heat added to the system (negative if removed from the system) and W is the work done on the system (negative if done by the system). From this is clear that if we add 30J of heat to the system and have it do 20J of work we will have $\Delta U=Q+W=(30J)+(-20J)=10J$ .

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Explain what happens with the light when you see black and white opaque objects

maksim [4K]

Answer:

When white light strikes a colored opaque object, some colors of light are absorbed and some are reflected. ... Some of the colors are absorbed and some are reflected. When white light shines on a white object, all colors are reflected. When white light strikes a black object, all colors are absorbed.

Explanation:

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3 years ago

Read 2 more answers

A car drives to the east in a time of 6 hours. Then, immediately (not realistic, but just assume this is the case for this probl

garri49 [273]

Answer:

Average speed of car in the first trip is 10 km/hr

Explanation:

It is given that first the car drives 6 hours to the east

Then travels 12 km to west in 3 hours

Average speed for the entire trip = 8 km/hr

Total time = 3+6 = 9 hour

So distance traveled in 9 hour = 9×8 = 72 km

As the car travel 12 km in west so distance traveled in east = 72-12 = 60 km

Time by which car traveled in east = 6 hour

So speed $=\frac{distance}{time}=\frac{60}{6}=10km/hr$

So average speed of car in the first trip is 10 km/hr

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3 years ago

In which stage of life will the sun undergo the most change?.

Nat2105 [25]

Between the two asymptotic gigantic branches, the Sun changes the greatest in size, brightness, and temperature.

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2 years ago

Will Upvote!!!

katrin2010 [14]

The answer is A. Since the car is moving at a constant velocity, the car not accelerate no matter how far it travels.

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3 years ago

Oxygen and hydrogen are kept under the same temperature and pressure. Oxygen molecule is 16 times more massive than hydrogen one

olya-2409 [2.1K]

Answer:

The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.

Explanation:

The kinetic energy of gas molecule is given by following equation:

$K.E = \frac{3}{2} KT$

Since the temperature (T) is constant for both molecules. Therefore, there kinetic energies will also be the same. Therefore,

$K.E_{O_2} = K.E_{H_2}\\\frac{1}{2}m_{O_2}v_{O_2}^2 = \frac{1}{2}m_{H_2}v_{H_2}^2 \\\\but,\\\\m_{O_2} = 16m_{H_2}\\\\therefore,\\16 m_{H_2}v_{O_2}^2 = m_{H_2}v_{H_2}^2\\\\\\taking square root on both sides, we get:\\4v_{O_2} = v_{H_2}\\\\v_{O_2} = \frac{v_{H_2}}{4}$

The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.

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3 years ago