Exam 5: Applying Newtons Laws

Jason takes off from rest across level water on his jet-powered skis.The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible).The skis have a thrust of and a coefficient of kinetic friction on water of 0.10.Unfortunately,the skis run out of fuel after only 67 s.How far has Jason traveled when he finally coasts to a stop?

When a parachutist jumps from an airplane,he eventually reaches a constant speed,called the terminal speed.Once he has reached terminal speed

Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure.The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N.What is the mass M?

A new roller coaster contains a loop-the-loop in which the car and rider are completely upside down.If the radius of the loop is with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.

A 50.0-kg box rests on a horizontal surface.The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200.What is the friction force on the box if (a)a horizontal 140-N push is applied to it? (b)a horizontal 175-N push is applied to it?

Three boxes in contact rest side-by-side on a smooth,horizontal floor.Their masses are 5.0-kg,3.0-kg,and 2.0-kg,with the 3.0-kg box in the center.A force of 50 N pushes on the 5.0-kg box,which pushes against the other two boxes. (a)Draw the free-body diagrams for each of the boxes. (b)What magnitude force does the 3.0-kg box exert on the 5.0-kg box? (c)What magnitude force does the 3.0-kg box exert on the 2.0-kg box?

A 600-kg car is going around a banked curve with a radius of 110 m at a speed of .What is the appropriate banking angle so that the car stays on its path without the assistance of friction?

A system of blocks and a frictionless pulley is shown in the figure.Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μ_s = 0.40 between the surface and block A.The rope pulls horizontally on block A.Block C has a mass of 1.0 kg.An external force ,applied vertically to block A,maintains the system at rest as shown in the figure.What is the friction force on block A?

A 23 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long.There is no appreciable friction between the nail and the string.If the tension in the string is while the mass moves in a uniform circle on the table,how long does it take for the mass to make one complete revolution?

A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400.He exerts a force F sufficient to accelerate the crate forward.At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration?

A wooden block A of mass 4.0 kg slides on a frictionless table when pulled using a massless string and pulley array by a hanging box B of mass 5.0 kg,as shown in the figure.What is the acceleration of block A as it slides on the frictionless table? Hint: Think carefully about the acceleration constraint.

A 600-kg car traveling at is going around a curve having a radius of 120 m that is banked at an angle of 25.0°.The coefficient of static friction between the car's tires and the road is 0.300.What is the magnitude of the force exerted by friction on the car?

Which one of the following free-body diagrams best represents the free-body diagram,with correct relative force magnitudes,of a person in an elevator that is traveling upward with an unchanging velocity? _f is the force of the floor on the person and _g is the force of gravity on the person.

The magnitude of the drag force of air resistance on a certain 20.0-kg object is proportional to its speed.If the object has a terminal speed of ,what is the magnitude of the drag force on the object when it is falling with a speed of ?

Block A of mass 8.0 kg and block X are attached to a rope that passes over a pulley.A 50-N force P is applied horizontally to block A,keeping it in contact with a rough vertical face.The coefficients of static and kinetic friction between the wall and block A are and .The pulley is light and frictionless.In the figure,the mass of block X is adjusted until block A descends at constant velocity of 4.75 cm/s when it is set into motion.What is the mass of block X?

A car enters a 300-m radius horizontal curve on a rainy day when the coefficient of static friction between its tires and the road is 0.600.What is the maximum speed at which the car can travel around this curve without sliding?

In the figure,two wooden blocks each of 0.30 kg mass are connected by a string that passes over a very light frictionless pulley.One block slides on a horizontal table,while the other hangs suspended by the string,as shown in the figure.At time t = 0,the suspended block is 0.80 m over the floor,and the blocks are released from rest.After 2.5 s,the suspended block reaches the floor.What is the coefficient of kinetic friction between the table and the sliding block?

If you swing a bucket of water fast enough in a vertical circle,at the highest point the water does not spill out because an outward force balances the pull of gravity on the water.

Two objects have masses m and 5m,respectively.They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest.

A system comprised blocks,a light frictionless pulley,and connecting ropes is shown in the figure.The 9.0-kg block is on a perfectly smooth horizontal table.The surfaces of the 12-kg block are rough,with between the block and the table.If the 5.0-kg block accelerates downward when it is released,find its acceleration.