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Q. A brick is released with no initial speed from the roof of a building and strikes the ground in 2.70 {rm s}, encountering no appreciable air drag. How tall is the building? How fast is the brick moving just before it reaches the ground?
Q. An infinitely long line of charge has a linear charge density of 3.50×10^-12 C/m. A proton is at distance 18.0 cm from the line and is moving directly toward the line with speed 3000 m/s. How close does the proton get to the line of charge?
Discover the tensions in the rope
A certain type of laser emits light that has a frequency of 5.4 x10^14 Hz. The light, so, occurs as a series of short pulses, each lasting for a time of 2.7 x10-11 s.
The leg and cast weigh 200 N, with the center of mass as indicated by the blue arrow. The counterbalance w1 weighs 110 N. find out the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
An underwater diver sees the sun 58 above horizontal. How high is the sun above horizon to a fisherman in a boat above the diver.
A 2.00-m tall basketball player is standing on the floor 10.0 m from the basket. If he shoots the ball at a 30 degree angle from the horizontal, at what initial speed must he throw the ball so that it goes through the basket without striking the back..
An object, mass 1.48 kg, moves in a horizontal circle with a radius of 1.52m. The object has an intial velocity of 28.0 m s-1. If the kinetic coefficient of friction between object and surface is 0.382.
A Ferris wheel is a vertical, circular amusement ride with radius 6 m. Riders sit on seats that swivel to remain horizontal. The Ferris wheel rotates at the constant rate, going around once in 6.4 s. Consider a rider whose mass is 70 kg.
A 50-kilogram woman balances on one heel of a pair of high heel shoes. If the heel is circular with radius of .5 cm, what pressure does she exert on the floor.
A 9kg block is connected by a string over a light pulley to a 5kg block that is sliding over a flat table (i.e. the 9kg is pulling the 5kg off the table). If Co-efficient of kinetic friction is 0.200, find the tension in the string.
A projectile is fired horizontally from a gun that is 47.0 m above flat ground; emerging from the gun with a speed of 250 m/s.
Find the magnitude of the acceration of each block. what is the magnitude of the average force exerted on the ball by the wall.
A frictionless block of mass 1.95 is attached to an ideal spring with force constant 340 . At the spring is neither stretched nor compressed and the block is moving in negative direction at a speed of 12.6.
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