On each given day and location, tides rise and fall at
A) about the same time.
B) exactly the same time.
C) different times.
D) ever increasing rates daily.
Answer: C
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If y = 0.02 sin (30x ? 400t) (SI units), the frequency of the wave is
a. 30 Hz b. 15/? Hz c. 200/? Hz d. 400 Hz e. 800? Hz
The drive chain in a bicycle is exerting a torque of 0.850 N ? m to the wheel of the bicycle. The wheel has a moment of inertia of 0.100 kg ? m2. What is the angular acceleration of the wheel?
What will be an ideal response?
A 3.50-kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?
A. 2.4 kg B. 2.2 kg C. 2.7 kg D. 3.1 kg E. 1.5 kg