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27 Nov 2019

1)A 17.0 kg box is released on a35.0° incline and acceleratesdown theincline at 0.270 m/s2. Find thefriction forceimpeding its motion.
1 N
What is the coefficient of kinetic friction?
2


2)A car can decelerate at -5.00 m/s2 without skiddingwhen coming torest on a level road. What would be the magnitude ofitsdeceleration if the road were inclined at 12° uphill? Assume thesame static frictioncoefficient.
1 m/s2
3)Suppose that you are standing on a train acceleratingat0.22g.What minimum coefficient of static friction mustexist between yourfeet and the floor if you are not to slide?
1
4)If the coefficient of kinetic friction between a35.0 kgcrate and the floor is0.28, what horizontal force is requiredtomove the crate at a steady speed across the floor?
1 N
What horizontal force is required if µk iszero?
2 N

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Elin Hessel
Elin HesselLv2
20 Jun 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1) A car can decelerate at -5.00 m/s2 without skidding when coming torest on a level road. What would be the magnitude of its deceleration if the road were inclined at 12° uphill? Assume the same static friction coefficient.


2) A 6480 kg helicopter accelerates upward at 0.57m/s2 while lifting a 1190 kg car.

(a) What is the lift force exerted by the air on the rotors?

(b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter?

1. An object of mass 19 kg is placed on incline with friction.The incline is originally horizontal and then raised slowly and at21 degrees, the mass begins to slide down the incline. It is foundthat the coefficient of kinetic friction is 0.79 times thecoefficient of static friction. If the same object (same mass) isplaced on the same incline with an inclination angle of 42.2degrees (the mass will slide down the incline at this angle), whatis the magnitude of the acceleration on the mass in m/s2?
2. A mass enters the bottom of a 50 degree incline with acoefficient of kinetic friction of 0.6. At the bottom of theincline the mass is moving at 33 m/s and is moving up the incline.After the mass has traveled, 25 meters up the incline, what is themagnitude of its velocity in m/s?
3. A car is traveling around a circular, banked track withoutfriction. It is initially traveling around the bottom of the ramp(on the ground) where the inner radius of track is 351 meters. Thecar then increases its velocity by a factor of 1.7. If theinclination angle is 10 degrees, what is the height (verticaldistance above the ground) the car is traveling at this newvelocity. Answer in meters.
4. An yo-yo with a mass of 2.4 kg is swung in a vertical circle. Itis found that the string breaks at 228 Newtons. If its the yo-yo'sspeed is a constant and is the maximum speed the yo-yo can movebefore the string breaks, what is the the tension in the string atthe top of the circle in Newtons?
5. A roller coaster cart of mass 15.8 kg travels on the inside of aroller coaster track in a loop of radius 23.1 meters. The circle isa vertical circle similar to the yo-yo example done in class. Ifthe cart travels at a constant speed around the track and the valueof this speed is the minimum speed such that cart does not fall offthe track at the top of the track, was is the magnitude of thenormal force on the cart at the bottom of the track in Newtons?

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