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A worker pushed a 65.0-kg block 10.0 m along a level floor at a constant speed with a force directed 39.0° below the horizontal. If the coefficient of kinetic friction is 0.20, how much work did the worker do on the block?
You have three identical charged spheres, each with a charge of 4.05 µC. You have arranged them so they are each at the corners of a square that gauges 3.9m on a side. Discove
As shown in the figure below, a light string that does not stretch changes from horizontal to vertical as it passes over the edge of a table. The string connects m1, a 3.60
A car moving at 10 m/s crashes into a barrier and stops in 0.50s. There is a 20kg child in the car. Suppose that the child's velocity is changed by the same amount as the ca
Consider a string of length 1.0 meter, fixed at both ends, with mass 100 grams and tension 100 Newtons. Give the number of nodes and antinodes set up on the string if it is dr
A ship leaves the island of Guam and sails a distance 265km at an angle 37.0? north of west. In which direction must it now head so that its resultant displacement will be 120
A 5.0 kg mud ball drops from rest at a height of 20 m. If the impact between the ball and the ground lasts 0.90 s, what is the average net force exerted by the ball on the
A spaceship is approaching a space station at a speed of 1.8E5m/s. The space station has a beacon that emits green light with afrequency of 6.0E14 Hz. What is the change in
A 7.80 gram bullet moving at 540 m/s penetrates a tree trunk to a depth of 6.4 centimeter. Use work and energy considerations to calculate the average frictional force that st
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