A 2.0-kg ball is moving with a constant speed of 5.0 m/s in a horizontal circle whose diameter is 1.0 m. What is the magnitude of the net force on the ball?
A) 0 N
B) 20 N
C) 40 N
D) 50 N
E) 100 N
E
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Free Fall: An object is thrown upwards with a speed of 13 m/s. How long does it take to reach a height of 4.0 m above the projection point while descending? Neglect air resistance.
A. 0.42 s B. 1.2 s C. 2.3 s D. 3.1 s E. 4.2 s
Force on a Wire: For the horseshoe magnet shown in the figure, the left end is a north magnetic pole and the right end is a south magnetic pole. When the switch is closed in the circuit, which way will the wire between the poles of the horseshoe magnet initially deflect?
A. to the right B. to the left C. upward D. downward
A 92-kg man climbs onto a car with worn out shock absorbers and this causes the car to drop down 4.5 cm. As he drives along, he hits a bump, and this starts the car oscillating at an angular frequency of 4.52 rad/s. What is the mass of the car?
A) 890 kg B) 760 kg C) 920 kg D) 990 kg E) 1900 kg
Two masses m1 and m2, with m1 = 3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
a. 3 v b. v/3 c. 3v/4 d. v