What do we mean when we say that the Sun is in energy balance?
A) The amount of energy released by fusion in the Sun's core equals the amount of energy radiated from the Sun's surface into space.
B) The Sun maintains a steady rate of energy output into space.
C) The inward force of gravity balances the outward push of pressure.
D) The amount of energy contained in the Sun's magnetic field is in balance with the amount of energy going into solar activity such as sunspots and solar flares.
A) The amount of energy released by fusion in the Sun's core equals the amount of energy radiated from the Sun's surface into space.
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It takes Neptune a longer time to orbit the Sun than Earth does because Neptune
A) has much further to go. B) goes much slower. C) both of these D) none of these
Which of the following is a moon of Neptune?
A) Titan B) Triton C) Europa D) Ganymede
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c. b. 0.21c. c. ?0.21c. d. 0.93c. e. ?0.93c.
Electroweak theory results in models for combining the electromagnetic, weak and strong nuclear interactions into a single basic force
Indicate whether the statement is true or false