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A light beam reflects off the surface of a still lake. The light ray is orientated at 30 degrees with respect to the surface of the water. What is the angle between the incident ray and the reflected ray?
What is the ideal mechanical advantage, and what are the revolutions per minute for the output pulley?
How much taller, in meters, does the Eiffel Tower become at the end of a day when the temperature has increased by 19.5oC?
Rubbing your hands together warms them by converting work into thermal energy. What is the temperature increase
a horizontal force of 750 n is needed to overcome the force of static friction between a level floor and a 250 kg
After falling from rest from a height of 28 m, a 0.54-kg ball rebounds upward, reaching a height of 18 m. what average force was exerted on the ball
Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.180g and a charge of magnitude q. Find the tension in each of the threads
a 0.800-kg ball is on the end of a rope that is 1.39 m in length. the ball and rope are attached to a pole and the
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.25m/s.
a spacecraft drifts through space at a constant velocity of 5 kms. it then turns on a jet that provides a constant
question an achromatic lens is made of two very thin lenses with focal lengths f1 -28.7 cm and f2 20.4 cm that are
An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +10 mC carefully placed at the center of the sphere through a hole in the latter's surface. what charge is now present on the outside surface of t..
How many kilograms of air do you exhale? Assume that the density of air is 1.3 kg/m3.
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