A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s
What is the height of the cliff if air resistance is negligibly small? A) 22 m
B) 43 m
C) 77 m
D) 91 m
D
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Find the average density of a red giant star with a mass of 20 × 10^30 kg (approximately 10 solar masses) and a radius of 150 × 10^9 m (equal to the Earth's distance from the sun)
a. 1.41 × 10^?4 kg/m3 b. 0.007 kg/m3 c. 1.41 kg/m3 d. 710 kg/m3 e. 1.41 × 10^?3 kg/m3
It is an advantage for an automobile engine to run at a high temperature because
A. it allows the use of lighter engine components made from aluminum. B. a high operating temperature cools off the fuel before ignition. C. its efficiency is higher, since the temperature difference is what dictates efficiency. D. gasoline only ignites under high temperature conditions.
The kinetic energy of an object increases linearly as the velocity of the object increases
Indicate whether the statement is true or false
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 1000 m from the source is (in dB)
A. 62.8. B. 66.0. C. 68.5. D. 70.5. E. 72.0.