Which of the following statements about planetary nebulas is correct?
A. They expand at a typical rate of 20 kilometers per second.
B. They contain flakes of carbon and silicon material.
C. Their shape can be very irregular.
D. They are shells of glowing gas and dust ejected by dying Sun-like stars.
E. All of these choices are correct.
Answer: E
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What of these is the largest contributor to the average annual radiation dose? (See Table 25-5 for relevant data.)
a. Exposure during medical procedures. b. Radioactive isotopes of potassium in our bodies. c. Cosmic rays. d. Radon. e. Nuclear power.
A rectangular coil carrying a current in a magnetic field will experience a net torque that will cause the coil to rotate in that field, if the field is not along the coil axis
Indicate whether the statement is true or false
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum ? of the heat pump
a. 0.2 b. 4.4 c. 0.5 d. 7.6 e. 6.7
Standing Sound Waves: In a resonating pipe that is open at both ends, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at one end and a displacement antinode at the other end. D. None of these choices are correct.