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A person is pulling a box across a horizontal floor at a constant speed of 1.8 m/s.The string the person is using to pull the box makes an angle of 28.0° relative to horizontal. The box has a mass of 4.60 kg and the tension in the string is 13.6N.The box moves 4.30m to the right.
a) How much work is done on the box by gravity?
b) How much work is done on the box by the normal force?
c) How much work is done on the box by tension
d) How much total work is done on the box?
e) How much work is done on the box by the kinetic frictional force?
A 0.70 Kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained lenght triples. What is the mass of the second block?
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