How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g?°C.)
A. 190
B. 200
C. 240
D. 210
E. 50
Answer: D
Physics & Space Science
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A) lamp filament itself. B) wires leading to the lamp. C) voltage source. D) none of the above
Physics & Space Science
A force can be exerted on an object and yet do no work
Indicate whether the statement is true or false
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The radius of the Earth is r. A satellite of mass 100 kg is at a point 3r above the Earth's surface. What is the satellites' weight?
A. 6.3 N B. 110 N C. 61 N D. 38 N
Physics & Space Science
If ?o is less than one, then:
A) the universe is closed, and must recycle. B) the universe will expand forever. C) no matter could have existed. D) only dark energy exists in the universe. E) there is more matter than energy in the universe.
Physics & Space Science