Continental crust is
A) thinner than oceanic crust.
B) less dense than oceanic crust.
C) more dense than oceanic crust.
D) thinner and more dense than oceanic crust.
Answer: B
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If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.
You drop a freely falling body at the equator and at the north pole. The acceleration of the freely falling body at the equator is _______________ the acceleration of the freely falling body at the north pole
Fill in the blank(s) with correct word
In Newton's first law, the ________ of a body causes it to resist changes in its motion
Fill in the blank(s) with correct word
A 7.5 × 1014 Hz laser emits a 7.7-?s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3
What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 120 kV/m B) 340 kV/m C) 480 kV/m D) 240 kV/m E) 150 kV/m