Which of the following is not a vector?
a. The force that represents your weight.
b. The diameter of Earth.
c. The velocity of a baseball in flight.
d. Your displacement from walking five blocks to the North.
e. The unbalanced force from two people pushing a cart in opposite directions.
b
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Protoplanets of the Jovian planets could have grown very hot from
a. heat for the sun. b. radioactivity of light elements such as hydrogen and helium. c. the in fall of material at high velocity. d. tidal forces due to the sun. e. collisions with large planetesimals.
An infinite plane of charge with
is tilted at a 45° angle to the vertical direction as shown below. The potential difference, VA ? VB, in volts, between points A and B, a 4.50 m distance apart, is
?
?
a.
?7.06.
b.
?9.98.
c.
?14.11.
d.
+7.06.
e.
+9.98.
Angular momentum __________ conserved
Fill in the blank(s) with correct word
The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a current I. The magnetic field in the region is (
) mT. The loop can turn about the y axis. If ? = 30°, a = 0.40 m, b = 0.30 m, and I = 8.0 A, what is the magnitude of the torque exerted on the loop?
?
?
A. 2.5 N ? m B. 1.5 N ? m C. 3.1 N ? m D. 2.7 N ? m E. 0.34 N ? m