Air temperature can increase by the process of

A) moisture condensation.
B) contact with cold surfaces.
C) moisture evaporation.
D) all of the above


Answer: A

Physics & Space Science

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Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is

A) 24 watts. B) 6 joules. C) 6 watts. D) 24 joules. E) zero.

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A fixed focus camera has a focal length of 35.0 mm. How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?

A. 0.34 mm B. 0.41 mm C. 0.35 mm D. 0.47 mm

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Consider a square which is 1.0 m on a side. Charges are placed at the corners of the square as follows: +4.0 ?C at (0, 0); +4.0 ?C at (1, 1); +3.0 ?C at (1, 0); -3.0 ?C at (0, 1)

What is the magnitude of the electric field at the square's center? A) 1.1 × 105 N/C B) 1.3 × 105 N/C C) 1.5 × 105 N/C D) 1.7 × 105 N/C E) 1.9 × 105 N/C

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To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat

A) down. B) up. C) to room temperature.

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