i) How much energy would a girl expend if she were to slide a 120kgblock up a fr

Question

i) How much energy would a girl expend if she were to slide a 120kgblock up a frictionless slope (long with an angle of 30 degree tothe vertical) to a height of 3.4 m?
ii) How much energy would a weightlifter expend if he were tolift the same block up to the same vertical height? iii)how much energy would an engineer expend if they were toslide the same block up the slope with a coeffecient offriction(u=0.5) to a vertocal haight of 3.4m?
ii) How much energy would a weightlifter expend if he were tolift the same block up to the same vertical height? iii)how much energy would an engineer expend if they were toslide the same block up the slope with a coeffecient offriction(u=0.5) to a vertocal haight of 3.4m? ii) How much energy would a weightlifter expend if he were tolift the same block up to the same vertical height? iii)how much energy would an engineer expend if they were toslide the same block up the slope with a coeffecient offriction(u=0.5) to a vertocal haight of 3.4m?

Explanation / Answer

i) energy is required E=m*g*h=120*g*3.4 =3998 J (ii) it is the same as (i) (iii)total energy=total work done; mg*h + mg*cos60*0.5*3.4/sin60=5153 J

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