An object is attached to a vertical ideal massless spring and bobs up and down between the two extreme points A and B. When the kinetic energy of the object is a minimum, the object is located
A) 1/4 of the distance from A to B.
B) midway between A and B.
C) 1/ times the distance from A to B.
D) 1/3 of the distance from A to B.
E) at either A or B.
E
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At a certain instant in time, the field of an electromagnetic wave in a vacuum points in the -z direction, and the field points in the +y direction. In what direction is this wave traveling?
A) +x direction B) -x direction C) +y direction D) -z direction E) +z direction
The accelerating force of the wind on a small 300-kg sailboat is 780 N northeast. If the drag of the keel is 552 N acting west, what is the acceleration of the boat?
a. 4.4 m/s2 due east b. 1.8 m/s2 due north c. 2.6 m/s2 northeast d. 3.2 m/s2 north by northwest e. 0.23 m/s2 due east
Entropy: What is the change in entropy when 15.0 g of water at 100°C are turned into steam at 100°C? The latent heat of vaporization of water is 22.6 × 105 J/kg.
A. 90.8 J/K B. -90.8 J/K C. 339 J/K D. -339 J/K E. 0 J/K
How long does it take light to travel 1.0 m? (c = 3.0 × 108 m/s)
A) 3.3 ns B) 3.3 ?s C) 3.3 ms D) 3.3 s