High temperatures are required to get H nuclei to fuse because they ________ one another because of their ________ electric charges
a. attract; negative
b. attract; positive
c. repel; negative
d. repel; positive
d
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Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the tension in any one of the strings is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.75 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
a. 43 m/s b. 47 m/s c. 39 m/s d. 36 m/s e. 14 m/s
An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
The vernal equinox is the point on the sky where the Sun crosses the ____________ going north and east
a. north celestial pole b. south celestial pole c. celestial equator d. horizon