If a stone is dropped with an initial gravitational potential energy of 100 J but reaches the ground with a kinetic energy of only 75 J, this is a violation of the principle of conservation of energy
A) True B) False
B
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Suppose that Earth rotated once every 48 hours (instead of 24 hours), but Earth's orbit and the Moon's distance were still the same (and their masses were still the same). Which of the following statements would be true?
A) Along coastlines, the time between one high tide and the next would be longer. B) The length of the year would be longer. C) Along coastlines, the time between one high tide and the next would be shorter. D) The Moon's orbital period would be longer. E) There would be more days in each year.
Process of Science: The Fermi paradox shows that there can be no successful theory that predicts how common life is in the Universe
Indicate whether the statement is true or false
As with stars, binary galaxy pairs are useful in finding their total mass
Indicate whether the statement is true or false
For safety in climbing, a mountaineer uses a 50-m long nylon rope that is 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find the Young's modulus for the rope material