The alpha radiation first classified by Rutherford was in fact which of the following?
a. helium nuclei
b. high energy quanta
c. electrons
d. positrons
a
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Fundamental Forces: The main reason that there is a limit to the size of a stable nucleus is
A. the limited range of the gravitational force. B. the short range nature of the strong nuclear force. C. the weakness of the gravitational force. D. the weakness of the electrostatic force.
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J
A light year is a unit of
A) time. B) energy. C) distance. D) mass.
Water runs out of a horizontal drainpipe at the rate of 120. liters per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?
A) 12.0 N B) 19.6 N C) 15.8 N D) 8.88 N E) 6.20 N