A proton moving with a velocity of 4.0 × 104 m/s enters a magnetic field of 0.20 T. If the angle between the velocity of the proton and the direction of the magnetic field is 60°, what is the magnitude of the force on the proton?
A)
1.8 × 10-15 N
B)
0.60 × 10-15 N
C)
1.1 × 10-15 N
D)
2.2 × 10-15 N
E)
3.3 × 10-15 N
C
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A block of ice at 0°C is added to a 150. g aluminum calorimeter cup that holds 200. g of water at 10°C. If all but 2. g of ice melt, what was the original mass of the block of ice?
A) 47.6 g B) 38.8 g C) 62.2 g D) 42.0 g E) 31.1 g
A drawback to mining sulfides is the risk of _______________.
a. underground fires c. “rock bursts” b. tunnel collapse d. acid mine runoff
A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
Two speakers emit coherent sound waves into the open air. One of them produces 75 W of power. If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 
what is the power output of the second speaker?
A. 151 W B. 377 W C. Need more info to solve. D. 38 W