A marble rolls back and forth along the path shown. When it is at position B, its kinetic energy is
1) maximum,
2) minimum,
3) midway between maximum and minimum,
its momentum is
4) maximum,
5) minimum,
6) midway between maximum and minimum,
and its potential energy is
7) maximum.
8) minimum.
9) midway between maximum and minimum.
Answer: 1, 4, 8
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When a 4-cubic-ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is
a. 60 lbs. b. 120 lbs. c. 180 lbs. d. 240 lbs. e. none of the above.
A black hole may be indirectly detected from radiation emitted by the ________ disk that surrounds it as matter is pulled inward
Fill in the blank(s) with correct word
A neutron has a mass of 1.67 × 10^?27 kg. The de Broglie wavelength is 1.4 × 10^?10 m. How fast is the neutron going? (in m/s)
a. 3.4 × 10^3 b. 2.8 × 10^3 c. 3.9 × 10^3 d. 2.6 × 10^3 e. 1.7 × 10^3
An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving up at a constant speed. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator