A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's kinetic energy is transferred to the carbon atom?
a. 14.4%
b. 28.4%
c. 41.4%
d. 56.6%
b
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Which of the following statements about comets and asteroids is true?
A) All asteroids lie in the asteroid belt between Mars and Jupiter. B) Only asteroids collide with Earth. C) There are about 1 million known asteroids in the solar system. D) Most of the trillions of comets in our solar system have tails. E) Comets are balls of ice and dust.
A sunspot maximum occurred in the year 2015. If the solar cycle continues, the year of the sunspot maximum that immediately follows the 2015 cycle maximum will be _____
A) 2026 B) 2020 C) 2016 D) 2030
A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0 s?
A) 16 m B) 24 m C) 42 m D) 84 m
At room temperature, a typical person loses energy to the surroundings at the rate of 62 W
If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories) does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J) A) 1300 kcal B) 1100 kcal C) 1600 kcal D) 1000 kcal E) 1500 kcal