1. A 500 – N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.40. (a) Find the work done in pushing the box 20 m. (b) How much work went into overcoming friction and how much into accelerating the box?
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- 1. A box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate of 1.7 m/s for 6.5 s. (a) How much work does the force do on the box? (b) How much power is produced by the force in moving the box?35. A person pulls an object of mass 40 kg as far as 20 m above a flat floor at a constant speed. The force used is directed 370 upwards horizontally. The coefficient of kinetic friction of the object with the floor is 0.20. Determine the work by the person, the work by the frictional force, and the total work on the object.
- 3. A 60 kg boy does 60 push-ups in 40 s. With each push-up he must lift an average of 70 % of his mass a height of 40 cm off the floor. Calculate the following: a) the work the boy does for each push-up, assuming he does work only when he pushes up b) the total work done in 40 s c) the power for this period1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?A 50 N force is applied at an angle to the side of a box causing it to slide across a floor. The total work done to move the box 10m is 150 J (joules). A) what is the angle at which the force was applied? B) if the box has a weight of 735 N, what is the mass of the box?