A machine that uses 200 watts of power moves an object a distance of 15 meters in 25 seconds. What is the force needed and the work done by this machine?

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Answer 1 · 2015-12-08T14:23:05

(a)

#333.3"N"#

(b)

#5"kJ"#

(a)

Power is the rate of doing work.

#P=W/t#

#:.W=Pxxt#

Work done is force x distance moved in direction of force.

#W=Fxxd#

#:.Fxxd=Pxxt#

#:.F=(Pxxt)/d=(200xx25)/15=333.3"N"#

(b)

Since #W=Fxxd#

#W= 333.3xx15=5000"J"=5"kJ"#