Two stars of masses M and 6M are separated by a distance D. Determine the distance (measured from M) to a point at which the net gravitational force on a third mass would be zero
a. 0.41 D
b. 0.33 D
c. 0.37 D
d. 0.29 D
e. 0.14 D
d
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The notation s?1 means the same thing as
a. 1/s. b. Hz. c. per second. d. none of the above
A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt. At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?
a. midway on the way up b. at the top of its trajectory c. the instant it leaves the catcher's hand d. the instant before it arrives in the catcher's mitt
Consider a beam of free particles with a certain speed . If we double this speed, what happens to the beam’s de Broglie wavelength?
A. It increases by a factor of 2. B. It increases by a factor of 21/2. C. It remains the same. D. It decreases by a factor of 21/2. E. It decreases by a factor of 2.
At present, what is the primary way that astronomers carry out SETI programs (that is, search for extraterrestrial intelligence)?
A) by using radio telescopes to search for signals from extraterrestrial civilizations B) by analyzing the spectra of extra-solar planets in an attempt to detect oxygen C) by searching for planets around distant stars D) by using X-ray telescopes to search for signals from extraterrestrial civilizations E) by analyzing high-resolution images of nearby stars in search artificial structures