In general, which type of planet would you expect to cause the largest Doppler shift in the spectrum of its star?
A) a massive planet that is close to its star
B) a massive planet that is far from its star
C) a low-mass planet that is close to its star
D) a low-mass planet that is far from its star
A
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A ball is released moving straight up at 15. m/s. At some time later it is falling downward at 15. m/s. What was the magnitude of its average velocity over this time period?
A) 0. m/s B) 30. m/s C) 15. m/s D) 7.5 m/s E) 22. m/s
Which of the following is not a component of a stream's load?
a. Mother load b. Dissolved load c. Suspended load d. Bed load
The radiation from cell phones
A. does not cause cancer B. causes cancer, but not enough to worry C. causes over 1 % of the cancer in those who use them D. protects users from cosmic rays
The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?
A) 0.32 kg B) 3.1 kg C) 31 kg D) 1.9 kg E) 19 kg