Beginning at time t = 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to move at 1.2 m/s toward an elevator door located 16 m away, as shown above. The coefficient of kinetic friction uk between the box and the floor is 0.20. At t = 4.0 s, the elevator door opens and remains open for 5.0 s. The student immediately exerts a larger constant force on the box and the front of the box reaches the elevator door just as it starts to close.   (c) Calculate the magnitude of the new force that the student exerts.

Q: A skateboarder with mass m, = 44 kg is standing at the top of a ramp which is h, = 3.9 m above the…

A:

Q: If a 2.4 kg object is initially at rest on a frictionless, horizontal surface and subjected to a…

A: The equation of motion we use to solve this is v2-u2 = 2as, where v = the final velocity u = the…

Q: Under the influence of its drive force, a snowmobile is moving at a constant velocity along a…

A: Given:

Q: A skateboarder with mass m, = 44 kg is standing at the top of a ramp which is h, = 3.9 m above the…

A: (b)   From the Work-energy theorem along the ramp, the expression for the magnitude of the…

Q: A 5 kg block is at rest on a horizontal floor, and then you pull it with a cord that exerts a…

A:

Q: 4.18 Figure P.4.1 depicts a block of mass m = 300 kg at rest on a frictionless ramp that makes an…

A: Resolve the components of F , and mg

Q: Beginning at time t = 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to…

A: Given, mass of block = 30 kg initial speed = 1.2 m/s coefficient of friction = 0.20 time for…

Q: ticle above its point of projec

A:

Q: Under the influence of its drive force, a snowmobile is moving at a constant velocity along a…

A: According to Newton's second law -  F=ma Therefore,  a=Fm Given values,  m = 125 kg  F = 190 N a=190…

Q: The figure shows an overhead view of a 0.0260 kg lemon half and two of the three horizontal forces…

A:

Q: A warehouse worker exerts a constant horizontal force of magnitude 85 N on a 40 kg box that is…

A:

Q: The force acting on a skater of mass 73.4 kg is attenuated with her speed v as F=-1.23*v2, where v…

A: Given that: Mass of skater, m=73.4 kgF=-1.23 v2Initial speed, vi=4.06 m/sInitial speed, vf=2.24…

Q: The engines of a tanker broke down and the wind pushes the ship with a constant speed of 1.5 m / s…

A:

Q: In the figure below, a runaway truck with failed brakes is moving downgrade at 36 m/s just before…

A:

Q: In an amusement park water slide, people slide down an essentially frictionless tube. The top of the…

A: Given: Height difference between top and exit of the slide, H=3 mHeight of the exist above water…

Q: A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 24 N.…

A:

Q: A block of mass M released from height h moves down on an inclined plane with friction coefficient…

A:

Q: Q. A small bolck of mass of 1kg slides along the frictionless loop-the-loop track as in Fig. If it…

A:

Q: Each of the boxes shown below is pulled for 15 m across a level, frictionless floor by the force…

A: In the given scenario, the floor where boxes are kept is frictionless. The mass doesn't matter since…

Q: Chapter 05, Problem 010 GO A 0.180 kg particle moves along an x axis according to x(t) = - 14.0 +…

A:

Q: An object of mass 380 kg is sliding on a track. From A to B, the track is frictionless. From B to C…

A:

Q: A 6.53 kg block initially at rest is pulled to the right along a horizontal surface by a constant…

A: The expression for the net force,

Q: At what initial speed should a box of mass m be thrown parallel to the surface of the inclined plane…

A:

Q: A 10 kg object starts from rest and achieves a speed of 20 m/s in 10 s. How much force (in N) acted…

A: Mass of the object m=10 kg The initial speed of the object u =0 m/s The final speed of the object v=…

Q: A 6.0-kg block initially at rest is pulled to the right along a horizontal surface by a constant…

A: A. The magnitude of frictional force is

Q: A bicyclist of mass 68 kgkg (including the bicycle) can coast down a 6.1 ∘∘ hill at a steady speed…

A: A free body diagram for the given problem is shown below The forces acting on the cyclist are…

Q: 65-kg ice skater coasts with no effort for 75 m until she stops. If the coefficient of kinetic…

A: given  coefficient of kinetic friction = μ = 0.1  mass = 65 kg  distance covered s = 75 m  final…

Q: A fish of mass 1kg is lying still on an inclined plane at 3o degrees above the horizontal. the…

A: Gien, a fish of mass m=1 kg is lying still on an inclined plane at θ=3o degrees above the…

Q: On a horizontal air track, a glider of mass m carries a Γ-shaped post. The post supports a small…

A:

Q: Listen> Read the scenario. A cyclist is riding his bike at a constant speed of 5 m/s, and…

A:

Q: A cyclist is riding his bike at a constant speed of 5 m/s, and experiences a frictional force…

A: The equation for frictional force is given by, F=μkN Here, F is the frictional force, μk is the…

Q: 2. A 2.0-kg block was released from rest at point A. It then moves through point B until it finally…

A: Given in the problem , mass of block , m = 2 kg , h=3m, coefficient of kinetic friction between…

Q: The crate, which has a mass of 100 kg, is subjected to the action of the forces. If it is originally…

A:

Q: 5.00 kg block is thrown up an inclined plane with an initial speed of 8.00 m / s which stops after…

A:

Q: A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough…

A: Given that - mass of the crate velocity length coefficient of the kinetic friction  constant…

Q: In the figure below, a runaway truck with failed brakes is moving downgrade at 36 m/s just before…

A: By law of conservation of energy  KE bottom= PE top

Q: Suppose the roller skating woman has a mass of 41.3 kg. Her roller blades have a coefficient of…

A:

Q: A man ( mass = 100 kg) fall freely from rest and strikes the ground. During the collision with the…

A: mass=100 Kg time=0.2s Force exerted=2000N

Q: The package of mass M = 5 kg is released from rest at A which is h = 3 m above the ground. It slides…

A: Given: The mass of the package is 5 kg. The height is 3 m. The angle of inclination is 30 degrees.…

Q: 200N 100N 3

A:

Q: Two blocks of mass m1 = 0.6 kg and m2 = 2.4 kg are connected by a massless string, as shown in the…

A: The masses are  m1=0.6 kgm2=2.4 kg Since the system is released from rest its initial velocity u=0…

Q: A block with mass m = 6 kg is being pulled on a frictionless horizontal surface by a force F a…

A: Mass = m = 6kg Force = F = 10 N initial velocity = 2 m/ s Final velocity = 5 m/s

Q: Packages having a mass of 4-kg are delivered from a conveyor to a ramp with a velocity of vo = 0.9…

A:

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.