When you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing
A) toward each other.
B) away from each other.
C) away from the air stream, but not necessarily toward or away from each other.
Answer: A
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Measurements of the magnetic field of Venus reveal that the
a. planet has a large iron core. b. interior of the planet is molten. c. planet has no detectable magnetic field. d. planet rotates backwards. e. magnetic field is responsible for large auroral displays (northern lights) on Venus.
A ball on a string is being whirled around overhead when the string breaks. The ball will move in the direction of the centripetal force the moment the string breaks
a. True b. False Indicate whether the statement is true or false
If a spherical convex mirror has a radius of curvature R, the magnitude of its focal length is
A) R/2. B) R/4. C) R. D) 2R. E) 4R.
An image seen projected on a screen by a single lens
a. is always erect b. is always inverted c. is a real image d. is a virtual image e. none of the above