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kow [346]
3 years ago
11

A system experiences a change in internal energy of 36 kJ in a process that involves a transfer of 14 kJ of heat into the surrou

ndings. Simultaneously, which of the following is true?
a. Q= 14 u=36
b. U=Q-W
c. 14-36=22
d. 22 kJ of work is done on the system.
Physics
1 answer:
Andre45 [30]3 years ago
7 0

Answer:

b. U = Q - W

Explanation:

Given;

change in internal energy, ΔU = 36 kJ

heat transferred to the surroundings Q  = 14 kJ

Apply first law of thermodynamic; the change in internal energy is equal to heat added to the system minus work done by the system.

ΔU = Q - W

Since heat was lost to surroundings, Q = - Q

ΔU = (-Q) - W

36 kJ = -14 kJ - W

36 kJ + 14 kJ = - W

50 kJ = - W

W = - 50 kJ (the negative sign shows that work has been done on the system)

Thus, 50 kJ of work is done on the system.

The only correct answer in the given options is "b" U = Q-W

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2) A ray of light in air is approaching the boundary with water at an
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Answer:

Explanation:

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          n₁sinθ₁ = n₂sinθ₂

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5 0
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A field measuring 12 meters by 16 meters is to have a brick paver walkway installed all around it, increasing the total area to
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Answer:

1.5 m

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Let the width of pavement be d.

The new length, L' = 12 + 2d

the new width, W' = 16 + 2d  

New Area, A' = L' x W' = (12 + 2d)(16 + 2d) = 192 + 56 d + 4d^2

Difference in area = A' - A

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93 =  56 d + 4d^2

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