In order to jump off the floor, the floor must exert a force on you
a. in the direction of and equal to your weight.
b. opposite to and equal to your weight.
c. in the direction of and less than your weight.
d. opposite to and less than your weight.
e. opposite to and greater than your weight.
E
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A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.His kinetic energy at the top of the hill is
a. 0 J. b. 500 J. c. some value between 0 and 500 J. d. none of the above.
A candle is 49.0 cm in front of a concave spherical mirror of radius of curvature 70.0 cm. What are the image distance and the magnification, respectively?
a. -20.4 cm, +0.417 c. +20.4 cm, -0.417 b. +122.5 cm, -2.50 d. +122.5 cm, +2.50
By about how much does the greenhouse effect change the temperature of Earth?
A) 30 K B) 5 K C) ?16 K D) 500 K
A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at the horizontal position. What is the angular acceleration of the rod at the instant the rod makes an angle of 70° with the horizontal?
a. 3.7 rad/s2 b. 1.3 rad/s2 c. 2.5 rad/s2 d. 4.9 rad/s2 e. 1.9 rad/s2