How do we learn about Earth’s core, mantle, and crust?
a. magnetic field studies
b. seismic waves
c. x-ray imaging
d. all of the above
e. a and b
Ans: e. a and b
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Spectral lines shifted toward higher frequencies are called ________.
A. red shifted B. blue shifted C. Lines cannot be shifted toward higher frequencies.
A 0.140-kg baseball is thrown with a velocity of It is struck by the bat exerting an average force of 5000 N, which results in a velocity of 37.0 m/s in the opposite direction from the original velocity. How long were the bat and ball in contact?
A) 1.79 × 10-3 s B) 1.28 × 10-2 s C) 3.07 × 10-2 s D) 4.30 × 10-3 s
A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32 b. 0.45 c. 0.58 d. 0.19 e. 0.26
Which of these is impossible, by the second law of thermodynamics?
A. An engine that generates electricity by extracting heat from cold water and dumping waste heat to warmer air B. A single match carelessly discarded causes 1500 acres of woodland to burn C. Using heat exhausted by a refrigerator to cook a meal D. Water evaporating from a lake and then condensing to form clouds