The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped from rest. Its speed on striking the ground is exactly 132 ft/s. From what height was the ball dropped?
A. 132 ft
B. 421 ft
C. 165 ft
D. 272 ft
Answer: D
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Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.
When there is a 14.0-A current through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A) $0.24 B) $1.04 C) $2.16 D) $3.39
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 ?·m and the resistivity of aluminum is 2.82 × 10^–5 ?·m
a. L1 = 1.7 L2 b. L1 = 0.60 L2 c. L1 = 2.8 L2 d. L1 = 0.36 L2
A 7.50-kg bowling ball strikes a 5.20-kg pin. The pin flies forward with a velocity of 4.00 m/s; the ball continues forward at 5.50 m/s. What was the original velocity of the ball?
a. 11.3 m/s b. 8.27 m/s c. 0.128 m/s d. 1.34 m/s e. 4.61 m/s