A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake
as shown below. The coefficient of friction of ice is 0.1. (a) Calculate the minimum force
F he must exert to get the block moving. (b) What is its acceleration once it starts to
move, if that force is maintained?
Answers: 2
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For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.
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Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.
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For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat
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A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake
as shown...
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