How much would a teaspoon of white dwarf material weigh on Earth?
A) the same as a teaspoonful of Earthlike material
B) about the same as Mt. Everest
C) about the same as Earth
D) a few tons
E) a few million tons
D) a few tons
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What is the acceleration of a scooter that maintains a constant velocity of 15 m/s for 10 s?
A) 0 m/s2 B) 0.15 m/s2 C) 1.5 m/s2 D) 15 m/s2
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. Assuming there is no air resistance, when they hit the ground
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
A baseball leaves the bat with a speed of 47 m/s and an angle of 45° above the horizontal. A 5.0-m-high fence is located at a horizontal distance of 137 m from the point where the ball is struck. Assuming the ball leaves the bat 1.0 m above ground level, by how much does the ball clear the fence?
a. 59.7 m b. 47.7 m c. 49.7 m d. 121 m
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