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A person sees clearly wearing eyeglasses that have a power of -5.00 diopters when the lenses are 1.65 cm in front of the eyes.
(a) What is the focal length of the lens?
cm
(c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed?
diopters
A 4.0 kg block is released from rest at the top of a 30 degree frictionless incline. The block makes a head on elastic collision with another 3.0 kg block initially at rest on a horizontal surface at the bottom of the incline.
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In fact, the increased normal force at these large angles makes force of friction too large to move the lawnmower at all.
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A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0 m/s, and the distance from the limb to the level of the saddle is 3.00 m.
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
The coefficient of kinetic friction between the rock and the surface is 0.300. Illustrate what average thermal power is produced as the rock stops?
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