For the multiplication of 2.817 m divided by 6.3 m, the result should be reported with how many significant figures?
a. Two
b. One
c. Three
d. Four
e. Seven
a
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The intensity of a sound wave is directly proportional to
A. the frequency. B. the amplitude. C. the square of the amplitude. D. the square of the speed of sound. E. none of these answers are correct
For a falling ball the action force is the pull of Earth on the ball. The reaction force is the
A) air resistance acting against the ball. B) acceleration of the ball. C) pull of the ball on Earth. D) nonexistent. E) none of the above
A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) None of the above things happen.
Determine the minimum area of a flat ice floe 1.0 meter thick if it is to support a 2 000-kg car above seawater. (?ice = 920 kg/m3, ?sea = 1 020 kg/m3.)
a. 20 m2 b. 40 m2 c. 60 m2 d. 80 m2 e. 100 m2