According to Einstein's theory of relativity, how much energy is contained in the material of a one kilogram rock that is at rest on the ground?
A) None at all.
B) 3 × 1016 joules
C) 9 × 1016 joules
D) 9 × 1010 joules
E) 10-16 joules
C
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Mitch throws a 130-g lump of clay at a 590-g target, which is at rest on a horizontal surface. After impact, the target, including the attached clay, slides 2.8 m before stopping. If the coefficient of friction is ? = 0.50, find the speed of the clay before impact
a. 6.4 m/s b. 33 m/s c. 29 m/s d. 0.62 m/s e. 34 m/s
One mole of helium gas expands adiabatically from 2 atm pressure to 1 atm pressure. If the original temperature of the gas is 20°C, what is the final temperature of the gas? (g = 1.67)
In the context of this chapter, what is an orphan planet?
A) a planet-size object that does not orbit a star B) a planet orbiting a star that is not a member of a galaxy C) a planet that has microbial life but no larger organisms D) a planet with no moons, such as Mercury or Venus
A pair of protons in an atomic nucleus repel each other, but they are also attracted to each other. Why?
A) The pair repel each other by nuclear force but attract one another by an electrical force. B) The pair repel each other since they are both positively charges but they are held together by much stronger forces known as quarks. C) The pair attract each other by nuclear force but also repel one another by a weaker electrical force. D) Although it is known that protons repel each other at short distances because of like charge, it is not known what actually holds protons together in the nucleus because we have never seen the nucleus of an atom.