A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10-19 C)
A) 0 N
B) 1.6 × 10-16 N upwards
C) 1.6 × 10-16 N downwards
D) 1.1 × 10-16 N eastwards
E) 4.4 × 10-16 N westwards
B
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A system of a proton and an electron has a net charge of
a. +1.6 × 10^-19 C. b. –1.6 × 10^-19 C. c. 3.2 × 10^-19 C. d. zero.
If new moon fell on March 2nd, what is the Moon's phase on March 14th?
A) waning crescent B) first quarter C) full D) waxing gibbous E) waxing crescent
Johnny throws a shotput at an angle of 45.° and it travels a horizontal distance of 30. meters. If he releases the shotput at the same speed but changes the angle to 55.°, what will be the new range (distance)?
A) 25. m B) 28. m C) 41. m D) 32. m E) 37. m
A 300 turn coil of area 25 cm2 is placed in an 80 mT magnetic field. If the coil carries a current of 3.3 A and if the normal to the area of the coil makes an angle of 20 
with the direction of the magnetic field, what is the magnitude of the torque on the coil?
A. 0.20 N·m B. 0.19 N·m C. 0.072 N·m D. 0.068 N·m E. 0.039 N·m