Matthew pulls his little sister Sarah along the horizontal ground in a wagon. He exerts a force on the wagon of 60.0 N at an angle of 37.0° above the horizontal. If he pulls her a distance of 12.0 m, how much work does Matthew do?
A) 185 J
B) 433 J
C) 575 J
D) 720 J
C
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According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of ________
A) intense radiation emitted by the black hole itself B) light emitted by hot gas in an accretion disk that swirls around the black hole C) the combined light of thousands of young, high-mass stars that orbit the black hole D) radio waves emitted from radio lobes found on either side of the galaxy we see in visible light
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground. Such twice-as-high apples of the same mass, have
A) 1/4 the weight. B) 1/2 the weight. C) practically the same weight.
Two equal mass objects (which are in thermal contact) make up a system that is thermally isolated from its surroundings. One object has an initial temperature of 100°C and the other has an initial temperature of 0°C
What is the equilibrium temperature of the system, assuming that no phase changes take place for either object? (The hot object has a specific heat capacity that is three times that of the cold object.) A) 23°C B) 19°C C) 75°C D) 50°C E) 25°C
Degeneracy pressure stops the crush of gravity in all the following except
A) a very massive main-sequence star. B) a white dwarf. C) a neutron star. D) a brown dwarf. E) the central core of the Sun after hydrogen fusion ceases but before helium fusion begins.