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a) A 9.00 kg box slides across a level floor such that its speed changes from 4.50 m/s to 1.20 m/s over a distance of 4.00m. How much work was done by friction?
b) What was the work done by gravity?
a 1.0-cm-tall object is 20cm in front of a converging lens that has a 10cm focal length. use ray tracing to find the
Starting from rest, a car travels 1 350 meters in 1.00 minute. It accelerated at 1.0 m/s2 until it reached its cruising speed. What was its cruising speed
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The electron mass is 9×10?31 kg. What is the magnitude of the momentum of the electron
A hungry 161-kg lion running northward at 75.5 km/hr attacks and holds onto a 35.9-kg Thomson\'s gazelle running eastward at 61.4 km/hr. Find the final speed of the lion-gazelle system
question a railroad car of mass 2.52 x 104 kg is moving with a speed of3.95ms. it collides and couples with three other
A student sits at rest on a piano stool that can rotate without friction. The moment of intertia of the student-stool system is 4.1 kg*m^2. What is the resulting angular speed of the student
A particular engine has a power output of 4.00 kW and an efficiency of 23.0%. Assume the engine expels 7000 J of energy in each cycle. Find the energy absorbed in each cycle
A 5.70 kg object on a horizontal frictionless surface is attached to a spring with spring constant 940 N/m. What is the frequency of the motion
A light spring having a force constant of 139N/m is used to pull a 9.60kg sled on a horizontal ice rink. The coefficient of kinetic friction between the sled and the ice is 0.200. The sled has an acceleration of 2.40m/s^2 . A)Calculate the net upw..
You find an unlabeled box of fine needles, and want to determine how thick they are. What is the diameter of the needle
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