Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming negligible air resistance?
A) at least 3.0 cm
B) at least 4.9 cm
C) at least 6.8 cm
D) at least 9.8 cm
B
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A. True B. False
What is the theoretical efficiency of a Carnot engine that operates between 600 K and 300 K?
A) 100% B) 75% C) 25% D) 50% E) 0%
Which was one early problem with pendulum clocks?
a. Making sure the amplitude of the pendulum swing was accurate. b. The tendency of the pendulum string to stretch. c. Being able to know when it was the same time somewhere else in the world. d. Devising a workable mechanism to supply the energy to keep the pendulum swinging. e. Measuring how fast the sand or water moved through the clock.
A compound resulting from a major fuel impurity is
a. CO2. b. CO. c. SO2. d. HC.