A steel ball sinks in water but floats in a pool of mercury, which is much denser than water. Where is the buoyant force on the ball greater?
A) It is the same in both cases.
B) submerged in the water
C) floating on the mercury
D) It cannot be determined from the information given.
C
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The reason the wavelike nature of a moving baseball is not noticed in everyday life is that
A) it doesn't have a wavelike nature. B) its wavelength is too small. C) its frequency is too small. D) its energy is too small. E) its speed is too small.
Addition by Components: A car travels 20 km west and then 20 km south. Use components to find the magnitude of its displacement vector?
A. 0 km B. 20 km C. 28 km D. 40 km
Thermodynamic Devices: Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?
A. 10% B. 20% C. 25% D. 45% E. 80%
A right triangle has sides 5.0 m, 12 m, and 13 m. The largest angle not 90° of this triangle is nearest:
a. 21°. b. 23°. c. 67°. d. Not attainable since this is not a right triangle.