How fast would you have to travel in order to reach a star that is 50 light-years away from Earth when you are 40 years older than you were when you left Earth? One light-year is the distance light travels in one year
A) 0.58c
B) 0.68c
C) 0.78c
D) 0.88c
E) 0.96c
C
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The order in which solar energy is converted to the kinetic energy of an automobile is
A) photocells, electrolysis, motor, fuel cells, kinetic energy. B) photocells, electrolysis, fuels cells, motor, kinetic energy. C) electrolysis, fuel cells, photocells, motor, kinetic energy.
Why did Tycho conclude that the Sun revolves around the Earth?
A) He did not conclude that the Sun revolves around the Earth. B) He could not detect the parallax of stars expected if the Earth revolves around the Sun. C) He incorrectly measured the distance to the Sun and concluded it was in a low orbit around the Earth. D) Long-held tradition prevented him from even considering the idea.
Two equal positive charges are separated by d. Then one of the charges is replaced by a negative charge of the same magnitude. Take the potential at infinity to be zero. In which situation is the potential higher midway between the charges; is this value of potential zero?
a. the first situation; no c. the second situation; no b. the first situation; yes d. the second situation; yes
Sound in a vacuum is impossible
Indicate whether the statement is true or false