A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What is the net work done on the ice-cream cone?
a. 0 J
b. 0.5 J
c. 2 J
d. 20 J
Answer: a. 0 J
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At the lowest point in a vertical dive (radius = 0.58 km), an airplane has a speed of 300 km/h which is not changing. Determine the magnitude of the acceleration of the pilot at this lowest point
a. 26 m/s2 b. 21 m/s2 c. 16 m/s2 d. 12 m/s2 e. 8.8 m/s2
The greatest redshifts yet observed for quasars is about
A) 0.1. B) 0.7. C) 1.4. D) 7.0. E) 14.0.
The surface of the inclined plane shown is frictionless. If F = 30 N, what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?
a.
18 N
b.
27 N
c.
24 N
d.
21 N
e.
15 N
Simple Pendulum: As shown in the figure, a 0.23-kg ball is suspended from a string 6.87 m long and is pulled slightly to the left. As the ball swings through the lowest part of its motion it encounters a spring attached to the wall. The spring pushes against the ball and eventually the ball is returned to its original starting position. Find the time for one complete cycle of this motion if the spring constant (force constant) is 19 N/m. (Assume that once the pendulum ball hits the spring there is no effect due to the vertical movement of the ball.)
Fill in the blank(s) with the appropriate word(s).