Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is
A) 100 N.
B) 1000 N.
C) 10,000 N.
D) more than 10,000 N
Answer: B
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What happens to the light that is emitted from the accretion disk around a black hole?
A) It is redshifted. B) It is blueshifted. C) It is pulled in multiple directions by tides. D) It cannot be seen from anywhere in our solar system. E) It is absorbed by the black hole.
If the spectrum of star jessica peaks at optical wavelengths, and star Jacob's surface is twice as hot as jessica's surface, then jacob's spectrum peaks in the infrared.
Indicate whether the statement is true or false.
This diagram summarizes modern particle classification. Where do protons, neutrons, and electrons, the particles that make atoms, fit in?
A) Protons and neutrons are made of quarks, while electrons are leptons. B) Protons and neutrons are quarks, while electrons are leptons. C) Protons and neutrons are fermions, while electrons are bosons. D) Protons, neutrons, and electrons have a separate classification scheme; they are made neither of fermions nor bosons.
Which of the following expands more when the temperature is increased? Equal volumes of
A) iron. B) wood. C) ice water. D) helium. E) all expand the same.