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

A:

Q: A 800 kg car is traveling down a highway at 13.0 m/s when the driver notices a turtle in the middle…

A: Given Data: The mass is, m = 800 kg. The velocity is, v =13 m/s. The displacement is, d = 18 m.…

Q: Problem 5. A 6.0-kg block initially at rest is pulled to the right along a horizontal surface by a…

A:

Q: Consider the system of two crates shown below, which are tethered to each other by a massless…

A: Solution: given that m1 = 35 kg m2 = 60 kg L = 22 m angle = 31.7 degrees coeff of kinetic friction =…

Q: A 2.8 kg ball strikes a wall with a velocity of 6.7 m/s to the left. The ball bounces off with a…

A:

Q: An athlete pulls box E using an inextensible rope P while being resisted by another inextensible…

A: Solution:-Given thatmass of box E (m)=63 kgcoefficient of static friction (μs)=0.32coefficient of…

Q: . Find the coefficient of kinetic friction between the runners of the sled and the s

A: Given that Horizontal Force, F = 23 N Mass of the body/sled , m= 20kg Initial speed of the body/sled…

Q: A box of mass 11.6 kg is slid along the floor. The initial speed of the box is 1.8 m/s and it comes…

A: According to question--- Given value--- mass m = 11.6 kg. initial speed = 1.8 m/sec . final speed =…

Q: A 10 kg-block moves on a smooth horizontal surface with a speed of 10 m/s and slides into another…

A: Given data: Mass = 10 kg Initial speed = 10 m/s Coefficient of friction = 0.25 Need to determine the…

Q: The 0.8-kg particle slides across a frictionless horizontal plane. The force P applied to the…

A: given,  mass, m=0.8kg velocity of particle at t=0 is 3mps from the graph show above,  from 0 to 2s…

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: Two penguins, Wheezy and Mumble, are racing down an icy slope into the water below.  Wheezy has a…

A: The coefficient of friction μ=0.12 The angle of inclination θ=80 The free body diagram of the…

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

A: mass = 126 kg drive force = 195 N constant velocity = 5.60 m/s

Q: An object with a mass of 1.93 kg is initially at rest upon a horizontal, frictionless surface. An…

A: Given data: Mass of an object is, m= 1.93 kg The object is initially at rest, vi = 0 The applied…

Q: Two blocks, each of mass m = 2.1kg are pushed along the horizontal surface of a table by a…

A:

Q: A child slides down a snow‑covered slope on a sled. At the top of the slope, her mother gives her a…

A:

Q: A 7.0 kg toy car can move along an x axis. The figure gives Fx of the force acting on the car, which…

A: Here is the Question As the force acting on the car varies with time, we need to calculate the force…

Q: A 0.18- kg block on a wooden table is given a sharp blow with a hammer. The block then slides across…

A: Let m denotes the mass, Fmax denotes the maximum force, t denotes the base of the isosceles…

Q: A 80.0 kg skater with the Birmingham Bulls hockey team with an initial speed of 7.8 m/s stops…

A:

Q: During an Olympic 100-m sprint race, Usain Bolt, the world record holder in that race, quickly…

A: Given: Mass,m=94kgAcceleration due to gravity,g=9.8m/s2Contact Force,FC=2.8×103N a) The expression…

Q: lock of mass 2.00 kg starts from rest at the edge of the ramp as shown. It is pushed up ramp by a…

A: Motion of projectile can be divided into x component and y component. After leaving point A motion…

Q: A student pushes a physics textbook of mass 1.19 kg across a table with a horizontal force of 5.66…

A: The objective of this question is to find the speed of the textbook after a certain period of time.…

Q: coefficient of friction between the tires of Shirley's 1985 Ford Coupe and the dry pavement is 0.71.…

A:

Q: Starting from rest, a 28.4 kg child rides a 9.75 kg sled down a frictionless ski slope. At the…

A:

Q: A particle with a mass of 10 kg is moving at a velocity of (3t^2 + 4t)j m/s. What would be the…

A:

Q: A desperate hiker has to think fast to help his friend who has fallen below him. Quickly, he ties a…

A:

Q: A block of mass 13 kg is given an initial speed of 12 m/s, after which it slides across a horizontal…

A: initial speed = 12 m/s d = 18 m mass = 13 kg

Q: A packing crate with mass 80.0 kg is at rest on a horizontal, frictionless surface. At t = 0 a net…

A:

Q: A dockworker applies a constant horizontal force of 71.0N to a block of ice on a smooth horizontal…

A: According to the given data F=70 N S=10.5m t=4.80 sec. We need to find What is the mass of the…

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

A:

Q: Elena dimabato of Anolia, the princess who always cried, has an ugly block with a mass M = 8 kg that…

A: Mass of box =8kg Intial speed of box =4m/s Coficient of friction =0.312 Tension in string =8N

Q: A dated box of dates, of mass 4.2 kg, is sent sliding up a frictionless ramp at an angle of 0 to the…

A: Mass of box (m)= 4.2 kg  Angle of ramp with horizontal = θ  Ramp is frictionless Box is sent sliding…

Q: An applied force of 42.3 N directed at an angle of -17.7 degrees with respect to the +x direction…

A: Given: The force applied F = 42.3 N. The inclination of the incline θ = -17.7o. The mass of the…

Q: m resting on a 20° slope. The block has coefficients of friction μs = 0.64 and μk = 0.54 with the…

A: Givenθ=20°μs=0.64μk=0.54Mass of hanging, m=2 kg

Q: An object of mass 3 kg moves towards the negative x axis with a constant speed of 8 m/s and the…

A: Answer              11.466N

Q: A force in the +x-direction with magnitude F(x)= 18.0 N - (0.530 N/m) is applied to a 8.30 kg box…

A:

Q: A hockey puck with mass 0.166 kg is pushed across the ice with a constant force of 0.89 N. The…

A:

Q: 10. I wish to tow a 53 kg load (3 children plus a toboggan) up a snowy hill for a toboggan run,…

A: This is a question regarding the motion of a body under a combination of forces. The motion of the…

Q: long a wire in the positive direction of an x axis. Beginning at time t = 0, when the bead passes…

A: Given parameters,                        mass of the bead , m = 1.8 x 10-2 kg…

Q: A 20-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 28 N.…

A:

Q: The figure shows the configuration of two identical bricks. In case 1 the bricks are placed end to…

A: In our daily lives, we observe frictional forces at work in moving bodies that are in contact.…

Q: A clever coyote uses rocket powered skates to try to catch a roadrunner. The mass of the coyote is…

A:

Q: A student pushes a physics textbook of mass 1.15 kg across a table with a horizontal force of 5.48…

A: The objective of this question is to find the speed of the textbook after 2.3 seconds. We can use…

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.