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A car is moving along a straight stretch of road at 60 mph [ 26.7 meters/sec ]. The driver makes slams on his breaks locking them so that the car skids to a stop. Assume a constant braking force due to friction, and a kinetic friction coefficient of 0.70 between the tires and the road:
(a) calculate the braking distance from the instant that the brakes were applied,
(b) how much work did the friction do in stopping the car?
Two charges are brought together until they are 90.0cm apart, causing the electric force between them to increase by a factor of exactly 6. What was their initial separation distance
A uniform electric field has a magnitude 330 N/C and is directed along the +y-axis. what is the change in potential energy for this charge
Object O1 is 15.9 cm to the left of a converging lens with a 10.2-cm focal length. What is the overall magnification of this system
The object is authorized to move on a horizontal frictionless surface. The object is released from rest when the spring is compressed 0.15 m. Find out the force on the object.
A skier is accelerating down a 30.0 degree hill at 1.8 m/s^2. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if elevation change is 325 m.
Two parallel wires 10 cm apart carry currents of 18 A. What is the magnetic force between two wires for both case
An athlete is in an 800 m running sprint race. One lap around the track is 400 m. What is the athlete's average speed during this first lap of the race
A reflecting telescope has a main mirror with fM = 620 mm. If an eyepiece with a magnification of 15 is used, what is the total magnification of the telescope
A woman throws a ball at a vertical wall d = 3.0 m away. The ball is h = 1.5 m above ground when it leaves the woman's hand with an initial velocity of 12 m/s at 45°.
Reply in m/s. Also, why does the car's mass not matter.
a point charge q = +87.1 micro coulombs is held fixed at the origin. A second charge, with mass m = 0.0576 kg and charge q = +3.5 micro coulombs, Find the electric potential energy of the system of charges
The 3.3 kg piece of wood slides on the surface. The curved sides are perfectly smooth, but the rough horizontal bottom is 35 m long and has the kinetic friction coefficient of 0.24 with the wood. The piece of wood starts from rest 6.0 m above the rou..
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