What is the net power needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.00 seconds?
A) 100 kW
B) 10.0 kW
C) 140 kW
D) 14.0 kW
E) 275 kW
E
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If electrons were positive and protons were negative, Coulomb's law would be written
A) the same. B) somewhat differently. C) very differently.
Vision Problems: A nearsighted person has a far point that is 4.2 m from his eyes. What power contact lenses must he wear to allow him to focus on distant mountains?
A. 0.48 diopters B. -0.48 diopters C. -0.36 diopters D. -0.24 diopters E. 0.24 diopters
You observe a full Moon rising at sunset. What will you see at midnight?
A) a full Moon high in the sky B) a first quarter Moon C) a waning gibbous Moon D) a third quarter Moon
Water pressurized to 3.5 × 10^5 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
a. 2.5 × 10^5 Pa, 15 m/s b. 3.0 × 10^5 Pa, 10 m/s c. 3.0 × 10^5 Pa, 15 m/s d. 4.5 × 10^5 Pa, 1.5 m/s e. 5.5 × 10^5 Pa, 1.5 m/s