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2 years ago

10

Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By

how much did the internal energy of the system increase?

1 answer:

r-ruslan [8.4K]2 years ago

4 0

Answer:

8 J

Explanation:

Heat = work + change in internal energy

Q = W + ΔU

15 J = 7 J + ΔU

ΔU = 8 J

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Answer:

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Explanation:

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A plank of length L=2.200 m and mass M=4.00 kg is suspended horizontally by a thin cable at one end and to a pivot on a wall at

baherus [9]

Hello!

Let's begin by doing a summation of torques, placing the pivot point at the attachment point of the rod to the wall.

$\Sigma \tau = 0$

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- VERTICAL component of the tension at a distance of 'L' (L = 2.200 m)

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Doing the summation using their respective lever arms:

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Our unknown is 'theta' - the angle the string forms with the rod. Let's use right triangle trig to solve:

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$T = \frac{dMg}{Lsin\theta}$

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