A person standing at the edge of a cliff throws one rock straight up and another rock straight down at the same initial speed. The rock that was thrown ________ has less speed at impact.
A. downward
B. upward
C. Each rock has the same speed just before impact
Answer: C
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A steel wire hangs from a high-altitude balloon. The steel has unit weight of 77 kN/m3 and yield stress of 280 MPa. The required factor of safety against yield is 2.0. The maximum permissible length of the wire is approximately:
(A) 1800 m (B) 2200 m (C) 2600 m (D) 3000 m
A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply, all operating on direct current. When we compare the two, we find that
a. Icrockpot < Ikettle and Rcrockpot < Rkettle. b. Icrockpot < Ikettle and Rcrockpot > Rkettle. c. Icrockpot = Ikettle and Rcrockpot = Rkettle. d. Icrockpot > Ikettle and Rcrockpot < Rkettle. e. Icrockpot > Ikettle and Rcrockpot > Rkettle.
A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. This is governed by the second law of thermodynamics
a. True b. False Indicate whether the statement is true or false
A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20-kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.250 cm2 . If the time for the sculpture to stop was 1.00 ms, the pressure on his temple, in
N/m2, was a. 8.89 × 10^4. b. 1.65 × 10^5. c. 1.65 × 10^6. d. 8.89 × 10^8. e. 1.65 × 10^9.