When a 125-kg piece of equipment is hung from a steel wire of length 75 cm, it stretches the wire by 4.00 mm. If instead the wire had a length of 150 cm, but all else were the same, by what distance would the same equipment stretch the wire?
A) 4.00 mm B) 8.00 mm C) 2.00 mm D) 16.0 mm E) 1.00 mm
B
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A jet plane flying 600. m/s experiences an acceleration of 4.0 g when pulling out of the dive. What is the radius of curvature of the loop in which the plane is flying?
A) 1.2 km B) 5.8 km C) 0.64 km D) 9.2 km E) 7.0 km
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three are released simultaneously at the top of an inclined plane, and roll without slipping which will reach the bottom first?
A) sphere B) pipe C) cylinder D) they all reach bottom in the same time E) It depends on the angle of inclination.
In the leftmost photo below, an instructor demonstrates that a standard two-by-four on a curved dish can be rotated by the attractive force of a charged rod. The two-by-four is affected by the charged rod of the same way as:
a. the metal ball in the figure 20-3. b. the insulating object in the figure at above right. c. neither of the two; a different mechanism is involved since the two-by-four is so massive.
A diver, below the surface of a lake, notices that no light appears to be coming toward her greater than the angle 
measured from the vertical. If the index of refraction of water is 1.33, what is the angle 
A. 
B. 
C. 
D. 
E. 