Free Fall: A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s?
A. 7.0 m/s
B. 14 m/s
C. 21 m/s
D. 64 m/s
Answer: B
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The number of degrees of arc that your location is North or South of the Earth's equator is called your
A. longitude. B. declination. C. meridian. D. latitude
An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free body force diagram for the airplane?
A. Figure 1
B. Figure 2
C. Figure 3
D. Figure 4
E. Figure 5
The most massive planet in our solar system is
A) Saturn. B) Uranus. C) Mars. D) Jupiter. E) Neptune.
How does the hypothesis of inflation explain the near-uniformity of the cosmic microwave background?
A) The expanding universe would have cooled. B) Matter expanded into regions of space that had no matter, and thus ended up at the same temperature. C) Matter was near the critical-density for a universal collapse, which smoothed out the differences in temperatures. D) Prior to rapid inflation, all regions of space were close enough to bounce radiation back and forth and reach the same temperature.