As a kid playing on the playground, you would bend your knees when you landed after jumping off the monkey bars to reduce the "sting" in your feet. This worked because
A. bending your knees gave you upward momentum which partly canceled the downward momentum.
B. bending your knees lowered your center of gravity reducing the force of your fall.
C. bending your knees increased the time of contact for the ground to bring you to rest.
D. you didn't do it on purpose, your knees just buckle
C. bending your knees increased the time of contact for the ground to bring you to rest.
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The event horizon
a. is believed to be a singularity. b. is a crystalline layer. c. has a radius equal to the Schwarzschild radius. d. marks the inner boundary of a planetary nebula. e. is located at the point where synchrotron radiation is created around a pulsar.
The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is
a. 31.3 m. b. 3.13 m. c. 0.313 m. d. 0.0313 m. e. none of the above.
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
a. 3.5 rad/s b. 3.8 rad/s c. 4.1 rad/s d. 2.0 rad/s e. 5.6 rad/s
The lower A on a piano has a frequency of 30.0 Hz. If the tension in the 2.00-m-long string is 316 N and one-half wavelength occupies the string, what is the mass of the string?
a. 61.4 g b. 21.9 g c. 17.6 g d. 43.9 g e. 91.1 g