Like other solid bodies in the solar system, Earth's surface was kept molten by
A) radioactivity.
B) differentiation.
C) convection.
D) bombardment by small bodies.
E) the solar nebula.
D
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A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts down a ramp that makes an angle of 25.0° with the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.00 m down the ramp? A) 34.2 J B) 22.4 J C) 44.9 J D) 62.0 J E) This question cannot be answered without knowing the radius of the hoop.
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s acceleration is zero only in region II.
a.
True
b.
False
The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
D
e.
C and D
Suppose that we have two containers, one holding N molecules of helium gas, and one holding N/2 molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?
A. The helium B. The oxygen C. Both have about the same temperature. D. One cannot say without measuring.