A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The distance the ball is below the rooftop in meters is
a. 0.
b. 4.9.
c. 9.8.
d. 19.6.
e. none of these.
d
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This photo shows a radio telescope that is being used in the search for life beyond Earth. How is it being used in this search?
A) It is used to listen for signals deliberately broadcast by another civilization. B) It is used to obtain spectra of planets around other stars so that we can look for chemicals, like oxygen, that might indicate the presence of life. C) It is used to make detailed radar maps of Mars, from which we may be able to determine whether cities ever existed on our planetary neighbor. D) It is used to communicate with spacecraft that we have launched toward distance stars in search of life on planets that my orbit them.
The index of refraction, n, of a material is a measure of how the speed of light changes. What can be said about the speed of light in a material with n=1.5 compared to a material with n=1.7?
A. It is the same for both. B. It is slower in the n=1.7 material. C. It is slower in the n=1.5 material. D. It depends on the wavelength of the light.
When a charged cloud passes overhead, the ground below is charged by
a. induction. b. polarization. c. deduction. d. electrification.
A box is to be moved across a level surface. A force of magnitude 200 N may be applied at an angle of 30° below the horizontal to push the box or at an angle of 30° above the horizontal to pull the box, either application sufficient to overcome friction and move the box. Which application will cause the box to have the greater acceleration?
a. the one below the horizontal b. the one above the horizontal c. both give equal acceleration d. more information is needed