A solid sphere, a solid cylinder, and a hoop each have the same mass and radius. If they are spinning at the same angular velocity, which one has the greatest rotational kinetic energy?
a. the sphere
b. the cylinder
c. the hoop
d. They all have the same rotational kinetic energy.
c
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The critical temperature the core must reach for a star to shine by fusion is
A) 5,800 K. B) 11,000 K. C) 127,000 K. D) 10 million K. E) 100 million K.
Length Contraction: A spacecraft is measured by a scientist on the ground to have a length of 81 m as it flies overhead with a speed 2.4 × 108 m/s. The spacecraft then lands and its length is again measured by the scientist at rest on the ground. What result does he now get for the length of the spacecraft? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
A deuterium nucleus and a tritium nucleus react to yield one alpha particle, a neutron, and energy. For this reaction, the sum of the masses of reaction products after the reaction is ________ the sum of the masses of particles before the reaction.
A. greater than B. equal to C. less than
One mole of an ideal gas at 1.00 atm and 0.00°C occupies 22.4 L. How many molecules of an ideal gas are in one cm3 under these conditions?
a. 28.9 c. 2.69 × 10^19 b. 22,400 d. 6.02 × 10^23