_____ says that energy must flow from hot regions to cooler regions either by conduction, convection, or radiation
A) The law of energy transport
B) The law of conservation of energy
C) The theory of energy equilibrium
D) The theory of special relativity
A
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A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up. b. the velocity points up and the acceleration down. c. the velocity points down and the acceleration up. d. the velocity and acceleration both point down. e. the acceleration is zero.
An E galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. roughly equal numbers of upper and lower main sequence stars. e. mostly white dwarfs and supergiants.
According to the equation E = mc2, an object turns into energy when it reaches the speed of light
A) True B) False
Which of the following choices is not a way by which we can study the inside of the Sun?
A) We can send a space probe into the Sun's photosphere. B) We can probe the interior of the Sun by studying the vibrations in its photosphere. C) We can make a computer model of the Sun's interior that allow us to predict the observable properties of the Sun. D) We can study solar neutrinos.