During batting practice, two baseballs have the same speed when leaving the bat of Babe Ruth. One ball goes over the outfield fence for a home run, and the other can be caught by an infielder. The difference between the two swings is that the home run ball starts out at an angle ________ 45°.
Fill in the blank(s) with the appropriate word(s).
closer
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A simple machine cannot multiply
A) force. B) distance. C) energy. D) none of the above
A sample of ideal monatomic gas is cooled by 50.0 C° at constant volume by removing 831 J of energy from it. How many moles of gas are in the sample? (R = 8.31 J/mol ? K)
A) 2.50 mol B) 1.50 mol C) 1.33 mol D) 1.00 mol
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. What is true about the wavelengths of the characteristic X-rays that are produced in such a situation?
A. There is a continuous range of wavelengths produced, up to a maximum that depends on the energy of the electron beam used. B. There is a single wavelength of X-ray produced that depends on the energy of the electron beam used. C. There are a few specific wavelengths that are produced for a given metal and their wavelength is independent of the energy of the electron beam used. D. There is a continuous range of wavelengths produced, down to a minimum that depends on the energy of the electron beam used.
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has a coma and tail during most of each orbit. B) It came from the Kuiper belt. C) It has been on its current orbit for only a very short time compared to the age of our solar system. D) It came from the Oort cloud.