A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at –20 degrees Celsius. How much heat does the ice absorb as it is warmed to –10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)
80,000 J
Physics & Space Science
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The density of the Universe is
a. equal to the critical density if the Universe is closed. b. equal to the critical density if the Universe is flat. c. greater than the critical density if the Universe is flat. d. greater than the critical density if the Universe is open. e. None of the other choices are correct.
Physics & Space Science
Change in internal energy is
A) 1 – Qcold/ Qhot. B) Q/m. C) Qout/ Win. D) Q - W. E) 1 - Tcold/ Thot.
Physics & Space Science
The SI unit of centripetal acceleration is ______________
Fill in the blank(s) with correct word
Physics & Space Science
A cyclist does work at the rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 m/s?
A) 31 N B) 63 N C) 80 N D) 160 N E) 4000 N
Physics & Space Science