In simple harmonic motion, when is the speed the greatest? (There could be more than one correct choice.)
A) when the magnitude of the acceleration is a maximum
B) when the potential energy is a maximum
C) when the potential energy is a zero
D) when the displacement is a maximum
E) when the magnitude of the acceleration is a minimum
C, E
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What can you infer about the lepton number of the neutrino?
A. This quanton has lepton number = +1. B. This quanton has lepton number = -1. C. This quanton has lepton number = 0. D. One cannot determine this quanton’s lepton number from the processes we have studied.
The two lenses in a compound microscope work by
A. both forming virtual images. B. the lens closest to the object forming a real image, and the other lens forms a virtual image. C. both forming real images. D. the lens closest to the object forming a virtual image, and the other lens forms real image.
A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with incompressible oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? (For purposes of this problem, you can neglect the weight of the pistons.) A) 0.954 kN B) 1.88 kN C) 1.96 kN D) 3.67 kN E) 1.20 kN
How do high mass stars transport newly formed elements into the interstellar medium?
A) supernova explosions B) stellar winds C) formation of planetary nebula D) A and B E) A and C