A 4.0 kg mass is moving in a circular path of radius 2.5 m with a constant tangential velocity of 5.0 m/sec. The centripetal force on the mass is
A. 20 N.
B. 25 N.
C. 35 N.
D. 40 N.
E. 45 N.
D. 40 N.
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A farmer is using a tank of 20°C nitrogen pressurized to 540 kPa absolute. It exits the tank out a hose. The hose snaps and the farmer is hit with the expanding nitrogen. Air is primarily nitrogen so assuming it is air flowing with no losses, the temperature of the exiting nitrogen is nearest:
(A) ?120°C (B) ?90°C (C) ?70°C (D) ?50°C
When Nellie Newton hangs at rest in the middle of a clothesline, tensions will be the same in each side of the rope when
A) the lengths of each rope are the same. B) the angles for both sides of the rope are equal. C) she is in equilibrium.
Which of the following particles are made up of quarks? (There may be more than one correct choice.)
A) neutrinos B) muons C) hadrons D) mesons E) nucleons
How does quantum mechanics undermine the idea of determinism in physics?
a. Imperfect physics measurements leading to uncertainty in predictions. b. As described by Einstein's comment, "[God] is not playing at dice." c. Imperfect quantum physics measurements leading to uncertainty in predictions. d. Acceptance of the Heisenberg uncertainty principle. e. The discovery of "hidden variables."