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A box is pulled straight across the floor at a constant speed. It is pulled with a horizontal force of 48 N.
a. Find the net force (in N) on the box.
b. Find the force of friction (in N) from the floor on the box.
c. The person pulling on the box stops pulling and the box comes to a rest. Find the force of friction (in N) on the box when at rest.
A 1480-W heater carries a current of 13 A. How much does it cost to operate the heater for 42 min if electrical energy costs 15 cents per kWh
Compare this with the worst-case search time - assuming that the devil chooses the set of strings and the search key.
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