The equivalence principle can be best illustrated by ____
a. a person riding in an elevator
b. a rocket coasting through space at a constant velocity
c. the change in mass of a moving body
d. the formation of energy by nuclear fusion
e. a car ride on a highway with the windows open
a
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A tornado ______________ is issued when a tornado has been sighted or indicated on radar
Fill in the blank(s) with correct word
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
a. 41 mT b. 33 mT c. 55 mT d. 87 mT e. 57 mT
A car with tires whose radius is 35 cm is traveling along a highway at 29.8 m/s. What is the angular speed of the tires?
A) 90 rad/s B) 85 rad/s C) 80 rad/s D) 75 rad/s E) 70 rad/s
A quantum of radiation has an energy of 1.5 keV. What is its frequency? (h = 6.63 × 10^?34 J?s and 1 eV = 1.60 × 10^?19 J)
a. 3.6E+14 Hz b. 3.6E+17 Hz c. 2.3E+17 Hz d. 2.4E+18 Hz e. 1.4E+17 Hz