An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is
A) 200 N.
B) 300 N.
C) 400 N.
D) 800 N.
E) none of the above
Answer: B
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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).
As current flows through a uniform wire, the wire gets hotter because the electrons stop moving and therefore transform their lost kinetic energy into thermal energy in the wire
A) True B) False
A frictionless pendulum released from 65 degrees with the vertical will vibrate with the same frequency as if it were released from 5 degrees with the vertical because the period is independent of the amplitude and mass
A) True B) False
Two light sources individually provide intensity Io at a point. If the sources are operated at the same time and are coherent but out of phase 30°, what is the intensity at that point?
A) 3.7 Io B) 2.0 Io C) 3.0 Io D) 2.8 Io E) 1.0 Io