A satellite coasting at constant speed in a circular orbit
A) is beyond the pull of Earth's gravity
B) is nevertheless accelerating.
C) undergoes changes in its potential energy.
D) none of the above
Answer: B
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Which statement about the Local Group is false?
A) Most of its members are dwarf elliptical and irregular galaxies. B) It contains about 55 member galaxies. C) Its notable spirals include the Milky Way, M31, and M33. D) It contains the large radio galaxy Centaurus A. E) It is about three million light-years across.
Suppose you heat an oven to 400°F and boil a pot of water. Which of the following explains why you would be burned by sticking your hand briefly in the pot but not by sticking your hand briefly in the oven?
A) The water can transfer heat to your arm more quickly than the air. B) The water has a higher temperature than the oven. C) The molecules in the water are moving faster than the molecules in the oven. D) The oven has a higher temperature than the water.
A pure sample of 226Ra contains 1.5 × 10^13 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the decay rate of this sample? (1 Ci = 3.7 × 10^10 decays/s)
a. 8.0E–9 Ci b. 2.1E+2 Ci c. 5.6E–9 Ci d. 1.8E–1 Ci e. 2.5E–1 Ci
If a quantum of radiation has an energy of 2.10 keV, what is its wavelength? (h = 6.63 × 10^?34 J?s, 1 eV = 1.60 × 10^?19 J, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 0.95 nm b. 197 nm c. 0.59 nm d. 1.24 nm e. 0.14 nm