A box slides down a frictionless incline, and a hoop rolls down another incline. Both inclines have the same height, and both the box and the hoop have the same mass. If both objects start from rest, upon reaching the bottom of the incline which one will have the greater kinetic energy and which one will have the greater speed?
a. The box will have both the greater kinetic energy and the greater speed.
b. The hoop will have both the greater kinetic energy and the greater speed.
c. Both will have the same kinetic energy, but the hoop will have the greater speed.
d. Both will have the same kinetic energy, but the box will have the greater speed.
d
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The name of the NASA mission(s) that landed on Mars in 1976 was
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If sufficient force is applied to a crystal, it can be permanently deformed. Permanent deformation in metal crystals occurs due to atomic displacements on the planes that are most closely packed, and it happens in the most closely packed directions. Assume that a force is applied to a crystal of FCC copper that permanently stretches the crystal in the [001] direction. The (111) plane is one of the close-packed planes in FCC copper on which permanent deformation could occur.
(a) What is the angle between the [001] direction and the normal to the (111) plane? (b) Atom displacements along which close-packed directions within the (111) plane could contribute to the permanent deformation of the crystal in the [001] direction?
A 0.10 ?F capacitor is connected to a 120. volt rms 60. Hz source
(a) What is the capacitive reactance? (b) What is the rms current to the capacitor? (c) If both the capacitance and the frequency doubled, what would be the current?