A hydraulic jack has a mechanical advantage allowing a puny human to lift a car. Which of the following statements is true?
A. the input force is equal to the output force
B. the area of the input piston is equal to the area of the output piston
C. the distances the input and output pistons move are equal
D. the work done by the output piston is equal to the work done on the input piston
D. the work done by the output piston is equal to the work done on the input piston
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The front of a spacecraft forms a point at an angle of
As the spacecraft increases speed, what happens to this angle as observed in the rest frame?
A. It stays the same. B. It decreases. C. It increases. D. It decreases only if the spacecraft is going to the left. E. It decreases only if the spacecraft is going to the right.
The helium flash is the cause of some supernovae
a. True b. False Indicate whether the statement is true or false
Astronomers have begun to build instruments to detect "cosmic messengers" that are not forms of light, such as neutrinos, cosmic rays, and gravitational waves, because they
A) provide information about distant objects that we cannot obtain from light. B) provide higher angular resolution than we can obtain with light. C) are unaffected by the turbulence of Earth's atmosphere. D) can allow us to see beyond the horizon of the observable universe.
Which of the following lists the planets of our solar system in the correct order from closest to farthest from the Sun?
A) Earth, Mars, Mercury, Venus, Jupiter, Saturn, Uranus, Neptune B) Mercury, Earth, Venus, Mars, Jupiter, Saturn, Neptune, Uranus C) Mercury, Venus, Mars, Earth, Saturn, Jupiter, Neptune, Uranus D) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune