Using a screwdriver, you try to remove a screw from a piece of furniture, but can’t get it to turn. To increase the chances of success, you should use a screwdriver that
1.is longer.
2.is shorter.
3.has a narrower handle.
4.has a wider handle.
4
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The supernova event for a massive star that has lost a large amount of mass to a close binary companion ____
a. does not show hydrogen emission lines in the spectrum of the remnant b. does not produce iron in the core before the explosion c. is less luminous because the companion star absorbs most of the remnant material d. is more likely to produce a neutron star than an isolated supernova e. triggers a supernova in the binary companion
The number of sunspots and their activity peak about every:
A) 36 days. B) six months. C) year. D) eleven years. E) 76 years.
Inside the same room, buoyant force is greater on
A) a helium-filled party balloon. B) an elephant. C) both the same
Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet’s south pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets?
a. The end magnets will move away from the center magnet.
b. The magnets will not move since they are equally spaced.
c. The magnets will snap together.
d. None of the above would happen.