A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. Assume that any other unbalanced forces are negligible
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?
(a) 12.2 m/s (b) 48.0° N of E
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Simple Harmonic Motion: If we double the frequency of a system undergoing simple harmonic motion, which of the following statements about that system are true? (There could be more than one correct choice.)
A. The period is doubled. B. The angular frequency is doubled. C. The amplitude is doubled. D. The period is reduced to one-half of what it was. E. The angular frequency is reduced to one-half of what it was.
The rotational inertia of a pencil is greatest about an axis
A) along its length, where the lead is. B) about its midpoint, like a propeller. C) about its end, like a pendulum.
If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)
a. 2.20 m/s2 b. 3.73 m/s2 c. 4.20 m/s2 d. 5.50 m/s2
A child is riding a tricycle. The pedals are attached directly to the front wheel, which has a radius of 13 cm. The rear wheels are smaller, and have a radius of 8.0 cm
If the child is pedaling at 16 rpm, what is the angular speed of the rear wheels? A) 15 rpm B) 26 rpm C) 24 rpm D) 20 rpm E) 50 rpm