A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, what happens to the water level in the tub?
A)
It goes up.
B)
It goes down.
C)
It does not change.
D)
cannot be determined from the information given
B
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At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
An object of mass m sits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?
A) The table pushing up on the object with force mg. B) The object pushing down on the table with force mg. C) The table pushing down on the floor with force mg. D) The object pulling upward on the Earth with force mg. E) The table pulling upward on the Earth with force mg.
The internal energy of a material does not depend upon which of the following?
(a) Energy of defects in the material (b) Kinetic energy of the vibrating atoms (c) Bond energy between atoms (d) Net energy resulting from a history of heating and cooling
The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission. b. nuclear fusion. c. neutron activation. d. nuclear emission. e. beta decay.