How would the passengers on the spaceship view our clocks?
A) Time is the same for everyone.
B) Our clocks are going fast.
C) Our clocks are going slow.
D) Our clocks are going at the same rate as theirs.
E) They can't see our clocks, but we can see theirs.
C
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An object of mass m is attached to a spring of spring constant k and it is pulled so that it starts to oscillate at its natural frequency f. Now the spring is cut in half and the experiment is repeated. What will be the new frequency of vibration?
1. f 2. f/?2 3. f?2 4. 2f
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
Pulsars' rotations are believed to slow down because
a. they are losing angular momentum into space via outward streaming particles b. they are dragging companions stars around in their magnetic field. c. they are getting tired d. of conservation of angular momentum. e. their mass is increasing.
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
A. 43 lb B. 34 lb C. 38 lb D. 47 lb E. 24 lb