Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
A) zero.
B) 250 N.
C) 500 N.
D) 1000 N.
E) none of the above
Answer: C
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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.
Suppose you are sitting at the origin of an inertial reference frame. You see (that is, you receive the light from) an event E occurring near a clock at x = -30 ns at a time t = 80 ns. When do you observe that event to occur?
A. tE = 0 B. tE = 30 ns C. tE = 50 ns D. tE = 80 ns, of course E. tE = 110 ns F. Some other time (specify)
Briefly discuss the rotation curve method, which is used for measuring the mass of a galaxy
What will be an ideal response?
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. How long does it take for the ball to hit the ground?
A) 0.29 s B) 0.57 s C) 1.14 s D) 2.0 s E) 9.8 s