A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?
A) Both its velocity and its acceleration point upward.
B) Its velocity points upward and its acceleration points downward.
C) Its velocity points downward and its acceleration points upward.
D) Both its velocity and its acceleration points downward.
B
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If atomic hydrogen can destroy ozone, and most of the matter in the universe is hydrogen, why is hydrogen not a major cause of ozone depletion?
What will be an ideal response?
A pure sample of 226Ra contains 2.3 × 10^13 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the activity of this sample?
a. 1.4E+10 decays/yr b. 1.0E+10 decays/yr c. 3.2E+2 decays/yr d. 3.7E+16 decays/yr e. 6.2E+6 decays/yr
A car originally traveling at 30 m/s manages to brake for 5.0 seconds while traveling 125 m downhill. At that point the brakes fail. After an additional 5.0 seconds it travels an additional 150 m down the hill. What was the acceleration of the car after the brakes failed?
What will be an ideal response?
Compared with special relativity, general relativity is more concerned with
A) acceleration. B) gravitation. C) spacetime geometry. D) all of the above E) none of the above