A golf ball moving forward with 1 unit of momentum strikes a heavy bowling ball that is initially at rest. After the golf ball bounces backward, the bowling ball is in motion with a momentum that must be
1) 1 unit.
2) more than 1 unit.
3) less than 1 unit.
The magnitude of the golf ball's momentum after collision must be somewhat less than 1 unit, for otherwise a violation would occur in the conservation of
4) energy.
5) momentum.
6) both.
7) neither.
Answer: 2, 4
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A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2 . What is the rotational inertia (of the wheel) about the
given axle? a. 0.023 kg/m2 b. 0.013 kg/m2 c. 0.020 kg/m2 d. 0.016 kg/m2 e. 0.035 kg/m2
What basic type of reaction is illustrated by the general equation A + BC ? B + AC?
a. Combination b. Decomposition c. Double-replacement d. Single-replacement
Any element heavier than helium is collectively referred to as a _______________
Fill in the blank(s) with correct word
A steel plate has a hole drilled through it. The plate is put into a furnace and heated. What happens to the size of the inside diameter of a hole as its temperature increases?
a. increases b. decreases c. remains constant d. becomes elliptical