A 160 lb person has a mass of 160/32 = 5 slugs. A 160 lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. The elevator cable breaks
a. 150 lb c. 170 lb
b. 160 lb d. none of the above
D
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Three galaxies, each of mass m = 4.0 × 1041 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 1022 m length. The magnitude of the force the other two galaxies exert on each galaxy is
A. 4.3 × 1027 N. B. 6.4 × 1027 N. C. 7.4 × 1027 N. D. 8.6 × 1027 N. E. 4.3 × 1028 N.
You carry a 20-N box 5 m horizontally across a room. The work you do is 100 N-m
a. True b. False Indicate whether the statement is true or false
When Percival Lowell insisted on the existence of Martian canals, even though his observations were discredited by other scientists, he exhibited
A) objectivity B) stupidity C) insanity D) personal bias
Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?
A) 1.022 MeV B) 223. MeV C) 1.88 GeV D) 940. MeV E) 0.47 GeV