Express the result of the following calculation, in scientific notation, to the proper number of significant figures: ((395600.1)/(6.72)) + 19
What will be an ideal response?
5.9 × 104
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You observe an x-ray burster. Based on current understanding, you can also conclude that you are observing
A) a close binary system in which one member is a white dwarf. B) a close binary system in which one member is a neutron star. C) a close binary system in which one member is a black hole. D) a close binary system in which one member is a neutron star and the other is a black hole.
Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright B. real and inverted C. virtual and upright D. virtual and inverted E. none of these choices are correct
The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?
A) more than 2 x 106 B) 1400 C) 700 D) 350 E) 35
Human reaction times are worsened by alcohol. How much further (in feet) would a drunk driver's car travel before he hits the brakes than a sober driver's car?
Assume that both are initially traveling at 50.0 mi/h and their cars have the same acceleration while slowing down, and that the sober driver takes 0.33 s to hit the brakes in a crisis, while the drunk driver takes 1.0 s to do so. (5280 ft = 1 mi)