A nuclear reaction is said to be endothermic if the total kinetic energy is
A)
less after the reaction than before.
B)
equal both before and after the reaction.
C)
greater after the reaction than before.
D)
zero after the reaction.
A
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If you lie on a bed of nails your back will encounter pressure due to contact with the nails. Nail pressure on your back will be less if the bed has
A) fewer nails. B) more nails. C) both of the above D) none of the above
The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun
A) when momentum is conserved. B) because velocity is conserved. C) when both velocity and momentum are conserved. D) if the masses of the bullet and gun are equal. E) none of the above
__________ in an x-ray spectrum of an atom occurs because of rapid deceleration of the bombarding electrons
Fill in the blank(s) with correct word
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
A. 3.5 rad/s B. 3.8 rad/s C. 4.1 rad/s D. 2.0 rad/s E. 5.6 rad/s