Your friend applies a horizontal force to your 2.0-kg physics textbook, which rests stationary against a vertical wall. The static and kinetic friction coefficients between the book and the wall are 0.20 and 0.15, respectively. With what force must your friend push on the book in order that it doesn’t slip down the wall?
A. 39 N
B. 20 N
C. 19.6 N
D. 25 N
E. 98 N
E. 98 N
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Wave Characteristics: Which one of the following lists gives the correct order of the electromagnetic waves from longer wavelength to shorter wavelength?
A. radio waves, infrared, microwaves, ultraviolet, visible, x-rays, gamma rays B. radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays C. radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays D. radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays E. radio waves, infrared, x-rays, microwaves, ultraviolet, visible, gamma rays
Which of the following can actually escape a black hole?
A. visible light B. electrons C. very low energy radio waves D. very high energy gamma rays E. None of these choices is correct.
The density of a planet can be determined by combining Doppler and astrometric measurements
Indicate whether the statement is true or false
A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The net force on the car is
A) 200 N forward. B) zero. C) 300 N backward. D) 5000 N downward. E) 500 N forward.