What volume of water is displaced by a submerged 2.0-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 10^3 kg/m3 and water density = 1.0 × 10^3 kg/m3)
a. 5.4E+3 m3
b. 7.4E–4 m3
c. 7.4E+2 m3
d. 5.4E–3 m3
e. 6.4E–4 m3
b
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A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1800 kg car after the collision is
A. 3.0 m/s WEST. B. 1.0 m/s EAST. C. 4.0 m/s EAST. D. 4.0 m/s WEST. E. 1.0 m/s WEST.
Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A) Its acceleration is decreasing in magnitude as the car slows down. B) Its acceleration is positive. C) Its acceleration is negative. D) Its acceleration is zero.
The specific heat of an object is:
a. its heat capacity divided by its mass. b. its mass divided by its heat capacity. c. the same as its heat capacity. d. its heat capacity multiplied by its mass. e. its temperature multiplied by the atmospheric pressure.
The temperature of outer space is
A) zero. B) about 2.7 kelvin. C) meaningless. D) none of the above