The electric field in the wires of an ac circuit
A) changes via the inverse square law.
B) changes direction with time.
C) remains relatively constant.
D) is nonexistent.
E) none of the above
Answer: B
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The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. An astronaut's life support backpack weighs 240 lb on Earth. What does it weigh on the Moon?
a. 40 lb c. 80 lb b. 120 lb d. 240 lb
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
A. the body is moving at constant velocity but is not rotating. B. the body is rotating at constant angular velocity but has no linear velocity. C. the body has neither linear nor angular velocity. D. the body may have constant linear or angular velocity, but not both simultaneously. E. the body may have constant linear or constant angular velocity, or both simultaneously.
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
A. nR ln (V2/V1) B. nRT ln (V2/V1) C. nk ln (V2/V1) D. 0 E. nR V2/V1
A projector lens is needed to form an image on a screen 6 times the size of its corresponding object. The screen is located 8.65 m from the lens. What is the required focal length of the lens?
a. 1.44 m b. 7.41 m c. 1.24 m d. 0.721 m e. 1.73 m