The energy per unit charge supplied by a battery is its
a. voltage
b. current
c. resistance
d. electric field
e. critical temperature
A
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A lamp uses a 150. W bulb. If it is used at 120. V, what current does it draw and what is its resistance?
What will be an ideal response?
A spaceship moves at a speed of 0.95c away from the Earth. It shoots a star wars torpedo toward the Earth at a speed of 0.90c relative to the ship. What is the velocity of the torpedo relative to the Earth? (The direction in which the spaceship moves is the positive direction.)
a. ?0.34c b. 0.34c c. 0.060c d. ?0.060c e. 0
In a model airplane, the propeller is a significant part of the total mass. A model airplane is flying on a level path, with its propeller rotating clockwise as seen facing the airplane
At a preset time, a signal causes the plane to lower its tail flaps and it goes into a nose-down attitude. When this happens, the nose of the plane also swings towards the right. Explain why this happens.
A camera has a converging lens with a focal length of 56 mm. If the f-number is 2.8, what is the diameter of the lens (in mm)?
a. 10 b. 31 c. 0.50 d. 20 e. 50