Exam 6: Momentum and Collisions: Part A

A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s²)

An amount of work equal to 3.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 15 g marble?

The net force acting on a 6.0-kg object is given by F_x = (12 - x)N,where F_x is in newtons and x is in meters.How much work is done on the object as it moves from x = 0 to x = 12 m?

I drop a 60-g golf ball from 2.0 m high.It rebounds to 1.3 m.How much energy is lost?

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 3.0 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

I use a rope 1.00-m-long to swing a 1.00-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?

A girl and her bicycle have a total mass of 40 kg.At the top of the hill her speed is 5.0 m/s.The hill is 10 m high and 100 m long.If the force of friction as she rides down the hill is 24 N,what is her speed at the bottom?

A rock is thrown straight up with an initial velocity of 20.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp,inclined at 20.0° with the horizontal and leaves it.Tamara accidentally bumps the wheelbarrow.It slides back down the ramp,during which a 60.0-N frictional force acts on it over the 50.0 m.What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s²)

A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s².How far does the car travel before it stops?

Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface,what is the net change in potential energy of the crate?

A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker,what total work is done on the wheelbarrow?

A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface,what is the force applied by the worker?

A simple pendulum,2.00 m in length,is released from rest when the support string is at an angle of 35.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s² and ignore air resistance)

An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km.What is its total energy (kinetic + potential)if the total was 0 when the airliner was at rest on the ground?

A bobsled makes a run down an ice track starting at 66 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

Water flows over a section of Niagara Falls at a rate of 6.00 × 10⁵ kg/s and falls 50.0 m.What is the power dissipated by the waterfall?

Rupel pushes a box 4.00 m by applying a 25.0-N horizontal force.What work does she do?

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.