A skater is using very low-friction rollerblades. A friend throws a Frisbee at her, on the straight line along which she is coasting. Describe the following event as an elastic, an inelastic, or a perfectly inelastic collision between the skater and the Frisbee. She tries to catch the Frisbee, but it bounces off her hands and falls to the ground in front of her
1.elastic
2.inelastic
3.perfectly inelastic
2
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Compton Scattering: A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.05 × 1016 J B. 2.10 × 1016 J C. 5.71 × 1016 J D. 3.34 × 1016 J E. 4.21 × 1016 J
Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.
A neutron star detectable by its rapid rotation and strong magnetic field is a(n) ________
Fill in the blank(s) with correct word
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The distance below the rooftop is __________
Fill in the blank(s) with correct word