The 300-N block in the figure is at rest on the rough horizontal plane before the force P is applied at t=0. The magnitude of P is 80t N, where t is the time in seconds, and its direction is constant. The coefficients of static and kinetic friction are Ms = 0.40 and Mk 0.20, respectively. Which of the following most nearly gives the time when the block starts to slide? Which of the following most nearly gives the value of × if the power developed by the force at a given instant is 0.20 hp?

The 300-N block in the figure is at rest on the rough horizontal plane before the force P is applied at t=0. The magnitude of P is 80t N, where t is the time in seconds, and its direction is constant. The coefficients of static and kinetic friction are Ms = 0.40 and Mk 0.20, respectively. Which of the following most nearly gives the time when the block starts to slide? Which of the following most nearly gives the value of × if the power developed by the force at a given instant is 0.20 hp?

Name: The 300-N block in the figure is at rest on the roughhorizontal plane
Uploaded: 2024-03-20T06:57:57.000Z
Channel: Bartleby
Description: The 300-N block in the figure is at rest on the roughhorizontal plane before the force P is applied at t=0.The magnitude of P is 80t N, where t is the time inseconds, and its direction is constant. The coefficientsof static and kinetic friction are M

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 63PQ: A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a...

See similar textbooks

Similar questions

a block of mass m 5.00 kg ispulled along a horizontal frictionless floor by a cordthat exerts a force of magnitude F = 12.0 N at anangle u = 25.0. (a) What is the magnitude of theblock’s acceleration? (b) The force magnitude F isslowly increased. What is its value just before theblock is lifted (completely) off the floor? (c) What isthe magnitude of the block’s acceleration just before it is lifted(completely) off the floor?
In the figure, a 5.50 kg block is sent sliding up a plane inclined at θ = 37.0° while a horizontal force of magnitude F = 55.0 N acts on it. The coefficient of kinetic friction between block and plane is 0.31. What is the magnitude and direction (up or down the plane) of the block's acceleration?
Two blocks A and B have a weight of 10 lb and 6 lb , respectively. They are resting on the incline for which the coefficients of static friction are uA = 0.15 and uB= 0.25. Determine the incline angle ?theta for which both blocks begin to slide. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k = 2lb lb/ft and is originally unstreched.
A dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of to the horizontal as a function of time t, the component vx of the box’s velocity along an x axis that extends directly up the ramp.What is the magnitude of the normal force on the box from the ramp?
the coefficient of static friction between block A and a horizontal floor is 0.320, and the coefficient of static friction between block B and the floor is 0.300. The mass of each block is 2.00kg,and they are connected together by a cord. If a horizontal force F pulling on block B is slowly increased ,in a direction parallel to the connectin cord,until the block start sliding ,what is the magnitude of F at the instant that they start to slide?
A student, crazed by final exams, uses a force of magnitude 80 N and angle u =70 to push a 5.0 kg block across the ceiling of his room ). If the coefficient of kinetic friction between the block and the ceiling is 0.40, what is the magnitude of the block’s acceleration?
s shown, the mass of block 1 is m1 = 4.0 kg and the mass ofblock 2 is m2 = 8.0 kg. Block 1 sits on an incline with an angle of37º. The coefficient of kinetic friction between m1 and the inclinedsurface is μk = 0.40. (a) What is the minimum coefficient of staticfriction if the system is to remain at rest? b) Assuming that μs isless than this value, what is the acceleration of the system?
The coefficient of static friction between block A and a horizontal floor is 0.470, and the coefficient of static friction between block B and the floor is 0.300. The mass of each block is 2.00 kg, and they are connected together by a cord. If the horizonta force F pulling on block B slowly increased, in a direction parallel to the connecting cord, until the blocks start sliding, what is the magnitude of F at the instant that they start to slide?
A block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The normal reaction force exerted by the plane on the block is? CHOICES: MgMg sin Mg cos "zero, since the plane is frictionless.?
A mass is given an initial velocity ?0 = 3.4 ?/? up a 15° incline. (a) If the coefficient ofkinetic friction between the mass and the incline is ?? = 0.26, how long before the masscomes to rest? (b) If the coefficient of static friction is ?? = 0.29, will the mass slideback down the incline?
A block is pushed across a horizontal surface by the force F with constant velocity. F=20 N, O=30°, M=10kg. What is the magnitude of the normal force on the block?
Two blocks connected by a string are pulled across a horizontal surface by a force applied to one of the blocks, as shown. The coefficient of kinetic friction between the blocks and the surface is 0.25. If each block has an acceleration of 2.0 m/s2to the right, what is the magnitude F of the applied force?