What is the equivalent resistance between points a and b when R = 13 ??
a.
29 ?
b.
23 ?
c.
26 ?
d.
20 ?
e.
4.6 ?
d
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When you sit on a chair, the reaction to your weight is
A) zero if in equilibrium. B) the chair pushing on you. C) the Earth being pulled up. D) your push down on the chair. E) the floor pushing up on the chair.
Which of the following colors undergoes the greatest REFRACTION when passing from air into glass?
A) yellow B) red C) blue D) orange E) green
What is the physical difference between light and a radio wave?
A) Light waves have a higher frequency than radio waves. B) Light is an electromagnetic wave while radio is a pressure wave in air. C) Light waves have a longer wavelength than radio waves. D) Light waves have a larger amplitude than radio waves. E) None of the above.
A pair of identical balls is connected by a massless rod, and thrown straight up into the air, such that the center of mass of the pair reaches a maximum height of 13.2 m above the point of release. On the way up, when the center of mass is at 6.6 m above to point of release, the velocity of one ball is measured to be 7.7 m/s downward. What is the velocity of the other ball at this time? Ignore air resistance.
A. 19.1 m/s up B. 3.7 m/s up C. 8.0 m/s up D. 0.3 m/s up E. 0.3 m/s down F. 3.7 m/s down