The top of the mantle is the same as the
A) base of the core.
B) base of the lithosphere.
C) top of the asthenosphere.
D) base of the crust.
Answer: D
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The wave front shown at the left for light in air reaches the plane surface (shown by a slanted line) that bounds a medium with n = 1.50.
Which diagram below correctly shows the wave front while entering the medium at the right?
A. A B. B C. C D. D E. E
The gas and dust in the disk of the Milky Way amount to approximately ________ of the mass of the stars.
A. 50% B. 15% C. 90% D. 30%
Two identical gliders slide toward each other on an air track. One moves at 1 m/s and the other at 2 m/s. They collide, stick, and moves at
A) 1/2 m/s. B) 1/3 m/s. C) 1/6 m/s. D) 3/4 m/s. E) 1.5 m/s.
Rotational Kinetic Energy: A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate. What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley?
A. 2.09 m/s B. 2.36 m/s C. 1.18 m/s D. 3.18 m/s E. 4.95 m/s