An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N
b. 10 N
c. 89 N
d. 68 N
e. 78 N
d
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Pressure: A 100-kg person sits on a 5-kg bicycle. The total weight is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa. What length of each tire is in contact with the ground?
A. 1.6 cm B. 1.8 cm C. 3.2 cm D. 2.4 cm E. 6.4 cm
A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The rotational inertia of the rod about this axis is ML2/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?
A. 9.8 rad/s2 B. 7.4 rad/s2 C. 8.4 rad/s2 D. 5.9 rad/s2 E. 6.5 rad/s2
In the fusion of low-mass nuclei to make heavier nuclei
A) thermal energy is produced. B) nuclear energy is converted to other forms. C) the final nucleus has a smaller rest-mass than the total rest-mass of the original nuclei. D) All of the above.
A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction was exerted on the stone as it fell?
A) 4.1 N B) 2.9 N C) 0.13 kN D) 7.2 N E) 1.2 N