Mkm¡Hkm2Block 1 sits on block 2 on a rough surface, and block 2 is pulled left by a string. Block 1 is moving with Block 2 without slipping.What is the direction of friction f12 on block 1 by block 2?leftrightdoes not existSubmit AnswerTries 0/2What is the direction of friction fis on block 1 by the floor surface?leftrightdoes not existSubmit AnswerTries 0/2What is the direction of friction f21 on block 2 by block 1?leftrightdoes not existSubmit AnswerTries 0/2What is the direction of friction f2s on block 2 by the floor surface?leftrightdoes not exist

“Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Answered: Mk m¡ Hk m2 Block 1 sits on block 2 on…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: Newton's Laws Of Motion

Section: Chapter Questions

Problem 74AP: (a) What is the minimum force of friction required to hold the system of Figure P4.74 in...

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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.
The human head can be considered as a3.3-kg cranium protecting a 1.5-kg brain, with a small amount ofcerebrospinal fluid that allows the brain to move a little bit insidethe cranium. Suppose a cranium at rest is subjected to a force of2800 N for 6.5 ms in the forward direction. (a) What is the finalspeed of the cranium? (b) The back of the cranium then collideswith the back of the brain, which is still at rest, and the two movetogether. What is their final speed? (c) The cranium now hits anexternal object and suddenly comes to rest, but the brain continues to move forward. If the front of the brain interacts with thefront of the cranium over a period of 15 ms before coming to rest,what average force is exerted on the brain by the cranium?
02 / The three blocks have a weight of WA = 20 Ib, WB = 40 lh, and WC = 60 lb, respectively. If the coeflicients of static friction at the surfaces of contact are as shown in the figure, determine the smallest horizontal force P needed to move block A?
Consider the figure below, where M 2 = 4.0 kg is stacked on top of M 1 = 12.0 kg, which is accelerating along ahorizontal, icy, frictionless surface at a = 5.0 m/s 2 . (a) What’s the minimum static coefficient of friction between the blocks that will prevent M 2 from sliding off? Draw a free-body diagram for each block (b) What’s the force acting on the bottom block given the condition in (a)?(c) If the coefficient of kinetic friction is half the amount you solved in (a) find the acceleration of block M 2 , where the acceleration of the bottom block remains the same.(d) What’s the force acting on the bottom block given the condition in (c)?
A block of mass 3.00 kg is pushed up against a wall by a force PS that makes an angle of u5 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude ofPS that allow the block to remain stationary. (b) Describe what happens ifuPSuhas a larger value and what hap-pens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of u5 13.0° with the horizontal. How do you find the mininum vaule of P in a)
What is the magnitude of the net force ∑? on a 1.5 kgbathroom scale when a 78 kg person stands on it? ∑?= N
What is the net force in the y-direction for the free body diagram below? options: Tsinα+WsinθTsinα+Wsinθ Tsinα−WsinθTsinα−Wsinθ Tcosα−WcosθTcosα−Wcosθ Tsinα−Wcosθ
What is the tension in the upper rope at point B ? At the zoo, two monkeys weighing 24.0 N each are playing on a rope-and-pulley system. If the lower rope is attached to a weight of mass m = 18.0 kg. What is the tension in the upper rope at point B?
I don't understand why Fs <= Fk. What does the F in (1) and (2) stand for? If it's force applied, wouldn't F = Fs + Fk for box 2, and (F - Fs - Fk) = Fs for box 1? My thinking is that the Force applied on box 2 minus the force of kinetic friction and the force of static friction applied by Box 1 on 2 would equal to the net force. Then the net force of box 2 would cause the same netforce on box 1, if box 1 isn't moving, then it's Fs should be equal to that net force applied on box 1. Therefore Force applied wouldn't be equal to Static Friction Force, and shouldn't it be bigger than the Kinetic Friction Force since it's moving in the direction of Force applied?
A contestant in a winter sporting event pulls a 43 kg block of ice in the positive horizontal direction with a rope over his shoulders across a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are µs=0.1 and µk=0.03. Calculate the minimum force F he must exert to get the block sliding in newtons? What is its acceleration in m/s2 once it starts to move, if that force is maintained?
** I am confused on this being below the horizontal. Is that making Fy a negative? If so, would that then affect the calculation for normal force? A box (M = 4 kg) is resting on a frictionless horizontal surface. Then there is a 25 Newton force acting onit at an angle 35 degrees below the horizontal.1. Find the horizontal component of the force, Fx - I have Fcostheta so 25cos35 = 20.479 N2. Find the vertical component of the force, Fy - I don't know if this should be 25sin35 or 25sin(-35) 3. Find the normal force acting on the box - Fn = mg - Fy (but I do not understand if this is going to be a positive or negative Fy, obviously negative would make this mg + Fy)4. Find the acceleration of the box5. Find the distance it will travel in 3 seconds.
Two blocks each of mass m = 3.50 kg are fastened to thetop of an elevator as in Figure P4.56. (a) If the elevator has anupward acceleration a = 1.60 m/s2, find the tensions T1 andT2 in the upper and lower strings. (b) If the strings can withstanda maximum tension of 85.0 N, what maximum accelerationcan the elevator have before the upper string breaks?

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