When a rock is held above the ground, we say it has some gravitational potential energy. When we let it go, it falls and we say the gravitational potential energy is converted to kinetic energy. Finally, the rock hits the ground (and stays there). What has happened to the energy?
A) The rock keeps the energy inside it in the form of mass-energy.
B) The energy goes into the ground and, as a result, the orbit of Earth about the Sun is slightly changed.
C) It is transformed back into gravitational potential energy.
D) The energy goes to producing sound and to heating the ground, rock, and surrounding air.
D) The energy goes to producing sound and to heating the ground, rock, and surrounding air.
You might also like to view...
A dime is 1.8 cm in diameter. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full moon
a. 2 m b. 2 cm c. 2 km d. 2 inches e. 2 ft
A spaceship, moving away from the Earth at a speed of 0.9c, shines a green laser backwards at Earth. An observer on Earth would see the light arriving at a speed of
A. c but at a smaller frequency. B. more than c but less than 1.9c. C. 1.9c and with a shorter wavelength. D. c but at a shorter wavelength. E. 0.1c and with an inverted frequency.
A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. A 2.0-kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring. What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 m)?
a. 5.3 J b. 6.8 J c. 6.3 J d. 5.8 J e. 6.5 J
The Galilean moons are _______________ satellites because they are large and orbit close to their parent planet
Fill in the blank(s) with correct word