A soccer ball is released from rest at the top of a grassy incline. After 6.4 seconds the ball has rolled 91 m with constant acceleration, and 1.0 s later it reaches the bottom of the incline
(a) What was the ball's acceleration?
(b) How long was the incline?
*a) 4.4 m/ (b) 120 m
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Why does the number of sunspots change over time?
A. The Sun's magnetic field changes in strength and shape with time. B. The brightness of the Sun increases and decreases with time. C. The temperature of the Sun increases and decreases over time. D. The solar wind changes speed with time, obscuring them. E. The number of sunspots does not change-the spots are simply on the other side.
If you exert a force F on an object, the force which the object exerts on you will
A) depend on whether or not the object is moving. B) depend on whether or not you are moving. C) depend on your mass. D) depend on the object's mass. E) always be -F.
Two forces produce equal torques on a door about the door hinge. The first force is exerted at the midpoint of the door; the second force is applied at the doorknob. Both forces are exerted perpendicular to the door
Which force has a greater magnitude? A) the first force (at the midpoint) B) the second force (at the doorknob) C) The two forces are equal.
Tom has a 4-inch refracting telescope, and Steve has a 3-inch reflecting telescope. Whose telescope has a higher resolving power?
A. Steve's, because mirrors are more efficient in showing the objects separately. B. Tom's, because lenses are more efficient in showing the objects separately. C. Steve's, because the smaller the diameter, the better the resolution. D. Tom's, because the larger the diameter, the better the resolution.