A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32
b. 0.45
c. 0.58
d. 0.19
e. 0.26
B
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A. the same. B. twice as much. C. half as much. D. four times as much. E. one-fourth as much.
Quarks come in how many flavors?
A. 2 B. 3 C. 4 D. 5 E. 6
The momentum of light
A. Is not in this chapter B. Is only a mathematical trick C. Cannot be measured D. Is not conserved
At what angle is the Sun above the horizon if its light is found to be completely polarized when it is reflected from the top surface of a slab of glass (n = 1.48)?
a. 34.0° b. 56.0° c. 0.594° d. 42.5° e. 47.5°