mechanics force and momentum

Q. an object sitting on a smooth surface is given an impulse (force) to start from rest and reached a veloctiy of 5m/sec in 2 seconds. 1. what is the mass of the object if the applied force was 20 N 2. what is the change in momentum 3. at the time given above the object is travelling towards the northwest with an angle ...continues

projectile

Q. a boy throws a stone from the edge of a cliff with an initial speed (Vo) at an angle of 30 degrees above the horizontal. when it hits the surface of a lake 22m below the top of the cliff, the stone is moving at a speed of 25 meters per second. what was its initial velocity.

velocity and projectiles

Q. a 4kg object resting on a pole 8m tall is struck by a 20 gram bullet, which is moving horizontally at 200 m/sec. the bullet remains embedded in the object. a. what horizontal velocity does the object acquire? b. how far from the base of the pole does the object strike the ground?

coefficient of friction

Q. a block of mass 60 Kg has an initial momentum of 100kg.m/sec travelling from A to B. on a surface of coefficient of friction of 0.4. A force F is applied to stop the block. it took the force 4 seconds to bring the block to rest at point B. ( see attached diagram). 1. what is the value of force F if the angle of top theta= 30 ...continues

coefficient of friction and tension

Q. a 10 kg block on a table for which the coefficient of friction is 0.4 is connected to a knot K by a horizontal string( as per attached diagram). another block of mass M hangs from point K and the string makes a 30 degree with the horizontal goes upward to a fixed wall. a. what maximum value can M be before block A starts t ...continues

word problem

A 1500kg car drives around a flat curve with a radius of 52m the car has an acceleration of 52m/s^2. What is the maximum force needed so the car will not slip?

word problem

A spring is 8cm long and has 12 joules of work. Using Hooks law, determine the constant of the spring.

word problem short

A 25kg ball is thrown 18m up in the air. What is it's initial velocity?

word problem

a 80kg man jumps out of a plane at a height of 1500m and v=4.5m/s^2 How much energy is lost? (assume no wind resistance)

word problem

A 5g bullet is shot (horizontally) hits a tree at 600m/s^2 and goes into the tree at a depth 4cm. What is the average friction force that will stop the bullet?