Jim exerts a force of 500 N against a 100-kg desk that does not move. Virgil exerts a force of 400 N against a 60-kg desk that moves 2 m in the direction of the push. Mik exerts a force of 200 N against a 50-kg desk that moves 5 m in the direction of the push. The most work is done by
A. Jim.
B. Mik.
C. Virgil.
D. Virgil and Mik, who do equal amounts of work.
Answer: B
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Melanie says that when a diver enters an underwater cave of height y, the pressure on her is no greater than ?Wgy. Rosalind says that if the bottom of the cave is a distance Y below the water surface, the pressure on the soles of the diver's feet can reach ?WgY. Which one, if either, is correct? (The density of water is ?W.)
A. Melanie, because the roof of the cave absorbs the water pressure from above. B. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. C. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. D. Rosalind, because the pressure also depends on ?c, density of the material above the cave roof, so that p =?cg(Y-y) +rWgy. E. Melanie, because the pressure equals p = ?WgH??cg(H?h).
The electric field of a point charge has an inverse _____ behavior
a. r3 c. r b. r2 d. r1/2
When the vector sum of three co-planar forces, 
, 
, and 
, is
parallel to , we can conclude that and
A.
B.
C.
.D.
.E.
.An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ