The atmosphere of Venus is
A. cold and moist.
B. dense and moist.
C. hot and dense.
D. dry and thin.
Answer: C
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Two objects of equal mass hit a wall with the same velocity. They both rebound with the same velocity. Both objects experience the same momentum change but one experiences twice the force as the other. Which of the following statements is true?
A. the contact time between the object and the wall of one is twice the contact time of the other B. the contact time between the object and the wall of one is equal to the contact time of the other C. the contact time between the object and the wall of one is one-half the contact time of the other D. the change in the kinetic energy is the same for the two objects E. the contact time between the object and the wall of one is 1/3 the contact time of the other
What particle is emitted when 20Na decays to 20Ne? (The atomic numbers of Na and Ne are, respectively, 11 and 10.)
a. beta (positron) c. alpha b. gamma quantum d. beta (electron)
Air near the equator averages higher temperatures than air near the poles because
A) polar air is cooled by ice and snow on the ground. B) solar energy is readily absorbed due to increased levels of CO2 and water vapor in the air. C) sunlight falls in a more vertical position at the equator than near the poles. D) the oceans near the equator are warmer than those near the poles.
Of all visible objects in the celestial sphere, which appears to move the least? Why?
What will be an ideal response?