Compared with the buoyant force of the atmosphere on a 1-kg helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-kg solid wood block is
A) considerably less.
B) considerably more.
C) the same.
Answer: A
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Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm3. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to
A) 1:3. B) 4:3. C) 3:4. D) 1:4. E) 4:1.
An automobile traveling along a straight road increases its speed from 30.0 m/s to 50.0 m/s in a distance of 180 m. If the acceleration is constant, how much time elapses while the auto moves this distance?
a. 6.00 s b. 4.50 s c. 3.60 s d. 4.00 s e. 9.00 s
The core of the Sun is
A) at the same temperature and density as the surface. B) at the same temperature but denser than the surface. C) hotter and denser than the surface. D) constantly rising to the surface through convection. E) composed of iron.
Free Fall: When a ball is thrown straight up with no air resistance, the acceleration at its highest point
A. is upward. B. is downward. C. is zero. D. reverses from upward to downward. E. reverses from downward to upward.