Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A. 200 N
B. 390 N
C. 790 N
D. 490 N
E. 590 N
Answer: C
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Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the front of both vanes. What is the net torque on the vane assembly, about the vertical axis? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 0.0 N ? m B. 6.0 × 10-12 N ? m C. 1.2 × 10-11 N ? m D. 1.8 × 10-11 N ? m E. 2.4 × 10-11 N ? m
Which one of the following equations is correct for the maximum kinetic energy of photoelectrons ejected from a metal?
A) Kmax = hc - Wo B) Kmax = h? - Wo C) Kmax = hf - Wo D) Kmax = h?/c - Wo E) None of the other choices is correct.
Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.
A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1 500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?