The force of static friction exerted on an automobile's tires by the ground
a. provides the accelerating force that makes the car move forward.
b. does positive work on the car while it is accelerating.
c. does negative work on the car while it is decelerating.
d. does everything listed in (a), (b) and (c).
e. only does positive or negative work as in (b) or (c).
a
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A pool player is attempting a fancy shot. He hits the cue ball giving it a speed of 5.57 m/s and directs its center on a path tangent to the surface of the target ball having the same mass as the cue ball
After the collision (on a frictionless table) the initially-stationary ball moves with a speed of 4.82 m/s. After the collision, the new speed of the cue ball and the relative direction of the balls are closest to A) 2.79 m/s, at 90° to each other. B) 2.79 m/s, at 60° to each other. C) 8.34 m/s, at 90° to each other. D) 8.34 m/s, at 60° to each other.
When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to
A) 1.0 N. B) 4.0 N. C) 16 N. D) 0.25 N. E) 0.063 N.
What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is 2.28 eV?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 580 nm B) 499 nm C) 633 nm D) 668 nm E) 545 nm
The upper right corner of the Hertzsprung-Russell diagram has:
A. all the white dwarfs B. the coolest and least luminous stars C. the hottest and most luminous stars D. the coolest and most luminous stars E. the hottest and least luminous stars