Give an example in which kinetic energy can be converted to thermal energy
What will be an ideal response?
The brakes on a car: applying the brakes on a car slows it down through friction of the brake pads with the brake drums. The car slows down, losing kinetic energy, and the pads warm up, gaining thermal energy (try touching your wheels-but be careful because they can become very hot-after using your brakes for a long time, e.g.,going down a steep mountain road).
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On the earth, when an astronaut throws a 0.250-kg stone vertically upward, it returns to his hand a time T later. On planet X he finds that, under the same circumstances, the stone returns to his hand in 2T
In both cases, he throws the stone with the same initial velocity and it feels negligible air resistance. The acceleration due to gravity on planet X (in terms of g) is A) g/4. B) g/2. C) g/ . D) g . E) 2g.
Living cells have already been recreated in our laboratories
Indicate whether the statement is true or false
_____ is the resistance of matter to the passage of radiation
A) Opacity B) Convection C) Luminosity D) Accretion
During the summer months in the Southern Hemisphere, ________.
A. Earth is closer to the Sun B. the Northern Hemisphere experiences winter weather C. the Sun is more directly overhead during this time D. the Sun is in the sky for a longer period of time E. All of these choices are correct.