A mass of 2.0 kg traveling at 3.0 m/s along a smooth, horizontal plane hits a relaxed spring. The mass is slowed to zero velocity when the spring has been compressed by 0.15 m. What is the spring constant of the spring?
A)
800 N/m
B)
400 N/m
C)
9.0 N/m
D)
18 N/m
E)
20 N/m
A
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Lenz's Law: A long straight wire lies on a horizontal table and carries an ever-increasing current toward the north. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the direction of the induced current in these coils is
A. clockwise in both coils. B. counterclockwise in both coils. C. clockwise in the east coil and counterclockwise in the west coil. D. counterclockwise in the east coil and clockwise in the west coil.
Compared to the diameter of a zirconium atom (A = 40), the diameter of a mercury atom (A = is approximately
A) four times as large. B) twice as large. C) the same size. D) one-half as large. E) one-quarter as large.
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.250 m/s?
a. 5.00 rev/s b. 7.85 rev/s c. 1.59 rev/s d. 0.80 rev/s e. 3.18 rev/s
Any massive object that is moving will
always have a) An unbalanced force acting on it. b) kinetic energy. c) angular momentum. d) potential energy.