As I use sandpaper on some rusty metal, the sandpaper gets hot because:
a. heat is flowing from the sandpaper into the metal.
b. heat is flowing from the metal into the sandpaper.
c. frictional processes increase the internal energy of the sandpaper.
d. heat is flowing from my hand into the sandpaper.
c
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Built in 1963, the _______________ telescope in Puerto Rico is the largest single radio dish in the world
Fill in the blank(s) with correct word
A block of wood has density 0.500 g/cm3 and mass 2 000 g. It floats in a container of oil (the oil's density is 0.750 g/cm3). What volume of oil does the wood displace?
a. 4 000 cm3 b. 2 670 cm3 c. 1 500 cm3 d. 1 000 cm3 e. 500 cm3
The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then
A) twice. B) three times greater. C) four times greater. D) none of the above
Stars that formed in the very early stages of our galaxy's formation have high amounts of "metals."
a. True b. False Indicate whether the statement is true or false