What form or forms of energy does a falling elastic ball have just before it is dropped from some height above the floor [see figure above]?
A) Elastic only
B) Gravitational only
C) Kinetic and gravitational
D) Kinetic only
E) Kinetic and gravitational and elastic
B
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A reasonable estimate for the mass of an ordinary passenger car is
A) 100 kg B) 1000 kg C) 5000 kg D) 10,000 kg
The total number of stars in the observable universe is about
A) 100 billion. B) the same as the number of grains of sand in a school sandbox. C) the same as the number of grains of sand on all the beaches on Earth. D) the same as the number of atoms that make up the Earth.
Who conceived the idea of using a crystal for observing diffraction of x-rays?
a. Roentgen b. von Laue c. W. L. Bragg d. W. H. Bragg
You carry a 7.0 kg bag of groceries 1.2 m above the level floor at a constant velocity of 75 cm/s across a room that is 2.3 m room. How much work do you do on the bag in the process?
A) 0.0 J B) 82 J C) 158 J D) 134 J