3 years ago

Someone please helppp :|||

Physics

2 answers:

SVEN [57.7K]3 years ago

7 0

Answer:

its c

Explanation:

i have asked my teacher

juin [17]3 years ago

4 0

Answer:

Explanation:

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Which feature of an object affects its weight? Select three options.

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Which example has the least kinetic energy

Stells [14]

Answer:

Explanation:

Let’s calculate the kinetic energy for all of the choices.

a. (1/2)(100)(100)^2 = 50(10000)=500,000

b. (1/2)(100)(1)^2 = 50

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d. (1/2)(1)(1)^2 = 0.5

We can see that (d) has the least kinetic energy.

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3 years ago

A system dissipates 12 J of heat into the surroundings; meanwhile, 28 J of work is done on the system. What is the change of the

Stels [109]

Answer:

+16 J

Explanation:

We can solve the problem by using the 1st law of thermodynamics:

$\Delta U = Q-W$

where

$\Delta U$ is the change of the internal energy of the system

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W is the work done (positive if done by the system, negative if done by the surroundings on the system)

In this case we have:

Q = -12 J is the heat dissipated by the system

W = -28 J is the work done ON the system

Substituting into the equation, we find the change in internal energy of the system:

$\Delta U=-12 J-(-28 J)=+16 J$

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3 years ago