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A girl pulls a box of mass m = 6 kg across a floor with a constant horizontal force F = 22 N. Initially the block is at rest. For the first d1 = 7 m, there is no friction between the box and the floor. For the next d2 = 7 m the coefficient of friction between the box and the floor is µ = 0.2.
a) What is the work done on the box by the girl in moving the box over the distance d1 + d2?
b) What is work done on the box by friction in moving the box over the distance d1 + d2?
c) What is the final speed of the box (after being pushed to d1 + d2)?
The girl lets go of the box at this point and it slides up a frictionless incline of angle q = 28°.
d) How high up will it go? (measured vertically from the floor)
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Charges of 4.0 uC and -6.0uC are placed at two corners of an equilateral triangle with sides of 0.10m. At the third corner, what is the electric field created by these two charges
A slide projector needs to create a 96 cm-high image of a 2.20 cm-tall slide. How far should you place the lens from the slide.
A force of 75N is applied horizontally to a box of mass 10kg, moving with an initial speed of 4m/s on a level surface with coefficient of kinetic friction= 0.3
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