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Q. A sports car moving at constant speed travels 90 m in 4.9s. If it then brakes and comes to a stop in 4s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be direction of travel.)
A string with linear density 2g/m is stretched along the positive x-axis with tension 20 N. One end of the string, at x = 0, is tied to a hook that oscillates up and down at a frequency of 100 Hz with a maximum displacement of 1.0 mm. At t = 0s, t..
Runner A is at first 6.60 km west of a flagpole and is running with a constant velocity of 6.4 km/h due east. Runner B is firstly 7.20 km east of the flagpole and is running with a constant velocity of 8.80 km/h due west.
A car is traveling 72.0 km/h when the driver applies the brakes. If if car slows down uniformly with an acceleration of -4.5 m/s2, how far does the car travel before coming to rest.
Blocks with masses of 2 , 4 , and 6 are lined up in a row on the frictionless table. All three are pushed forward by a 56 force applied to the 2 block. How much force does the 4 block exert on the 6 block.
Mary is driving her car at 48 km/h. She approaches an intersection just as the traffic light turns yellow. The yellow light lasts only 3.0 s before turning to red, and she is 30 m away from the near side of the intersection.
A cart loaded with bricks has a total mass of 21.2 kg and is pulled at constant speed by a rope. The rope is inclined at 27.2 ? above the horizontal and the cart moves 27.1 m on a horizontal floor. The coefficient of kinetic friction between groun..
An ore car of mass 4 000kg rolls downhill on tracks from a mine. At the end of the tracks, 10 m lower in elevation, is a spring with k = 400 000 N/m. How much is spring compressed in stopping the ore car? Ignore friction.
A 47 g golf ball is driven from the tee with an initial speed of 50.0 m/s and rises to a height of 24.8 m.
A 47 kg person, standing 0.980 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 3.10 m/s relative to the ground. Find resulting angular speed (in rad/s) of the disk.
A small, 300 g cart is moving at 1.60 m/s on an air track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s.
What are the velocities of the two people after the snowball is exchanged? Disregard friction between skate and the ice.
Two small non conducting spheres have a total charge of 85.2. When placed 1.09 apart, the force each exerts on the other is 10.4 and is repulsive. What is the charge on each.
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