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23 Nov 2019

A 5.0 kg crate is resting on a horizontal plank. The coefficientofstatic friction is 0.50 and the coefficient of kinetic frictionis0.40. After one end of the plank is raised so the plank makesanangle of 25 deg. with the horizontal, the force of frictionis:
a. 0
b. 18 N
c. 21 N
d. 22 N
e. 44 N

explain please
thanks :)

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Tod Thiel
Tod ThielLv2
3 May 2019

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Related textbook solutions

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

Related questions

A block is resting on a wooden plank. There is a hinge on one end of the plank which allows the other end to be lifted to create an angle,  , with respect to the horizontal as shown in the figure. The coefficient of static friction between the block and the plank is  

Part (a) Please select the correct Free Body Diagram, where Fg, is the force due to gravity, N is the normal force, and Fr, is the static friction force. 

Part (b) The angle A is slowly increased. Write an expression for the angle at which the block begins to move in terms of . 

Part (c) If a student measures that the block begins to move at an angle of = 22°, what is the numerical value of the coefficient of static friction, ?

Step 3: Enter your full question details here
Question is as follows:
Two wooden crates rest on topof one another. The smaller top crate has a mass of m1 = 22 kg andthe larger bottom crate has a mass of m2 = 91 kg. There is NOfriction between the crate and the floor, but the coefficient ofstatic friction between the two crates is µs = 0.84 and thecoefficient of kinetic friction between the two crates is µk =0.66. A massless rope is attached to the lower crate to pull ithorizontally to the right (which should be considered the positivedirection for this problem).
1) The rope is pulled with a tensionT = 466 N (which is small enough that the top crate will notslide). What is the acceleration of the small crate? Correct:Answer: 4.12m/s.
2) In the previous situation,what is the frictional force the lower crate exerts on the uppercrate?
Correct Answer: 90m/s
3) What is the maximum tension that thelower crate can be pulled at before the upper crate begins toslide? Correct Answer 930N
4) The tension is increased in the rope to1322 N causing the boxes to accelerate faster and the top box tobegin sliding. What is the acceleration of the uppercrate?
5) As the upper crate slides, what is theacceleration of the lower crate?

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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