3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.40 and the directional angle 8 for the force is 36.0°. Determine the magnitude of the force (F) when the block is about to slide down the wall. N ssfox s 50 ssf60 ssf60 ssf60 ssf6 6 sf60 ss sf60 ssf60 ssf60 ssf60 ssf60 s $ 09Jss (Diss 09JSS ssf ssf60 ssf60 ssf6 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60

3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.40 and the directional angle 8 for the force is 36.0°. Determine the magnitude of the force (F) when the block is about to slide down the wall. N ssfox s 50 ssf60 ssf60 ssf60 ssf6 6 sf60 ss sf60 ssf60 ssf60 ssf60 ssf60 s $ 09Jss (Diss 09JSS ssf ssf60 ssf60 ssf6 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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339 8 20 A 20 kg box is resting on horizontal surface initially. Then a F =50 N force pulls on the angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20. 6. What is the horizontal component of the force Fx ? box by a cord at an FN =soNo a 47 N C. 18.2 N b. 17.1 N d. 29 N Fx 7. What is the normal force acting on the box? 777 c. 196 N a. 47 N b. 179 N d. 125 N M9
3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.41 and the directional angle 0 for the force is 46º. Determine the magnitude of the force (F) when the block is about to slide up the wall. N F é
A100-kg sofa needs to be moved across a level floor. The coefficient of static friction between the sofa and the floor is 0.40. Two physics students decide to apply a force F!" on the sofa. One student recommends that the force be applied upward at an angle theta above the horizontal. The other student recommends that the force be applied downward at an angle theta below the horizontal. Explain which student has the better idea and why.
2. A block of mass 3.00 kg is pushed up against a wall by a force P that makes a 50.0° angle with the horizontal as shown in the figure. The coefficient of static friction between the block and the wall is 0.250. Determine the possible values for the magnitude of P that allow the block to remain stationary 50.0° P
a 50kg block of wood is inially at rest on a horizontal surface. The coefficients of static and kinetic friction between surfaces are 0.35 and 0.30 respectively. A.what value of horizontal force is required to start the motion of the block? B.what value of horizontal force is required to keep the block in constant velocity after moving? C.what magnitude of force will be needed to keep the motion constant if the force is applied 30° upward to the right above the horizontal?
Question 6 13. A7.5 kg backpack is sliding across the floor. The coefficient of friction between the backpack and the floor is 0.20. Answer the following: c) What is the force of friction on the backpack? Your answer: O 1.5 N O 7.4 N O 15 N O 74 N
9. A 75 N crate is at rest on an incline that is inclined a 25° above the horizontal. The coefficient of static friction between the crate and the incline is 0.25 and the coefficient of kinetic friction between the crate and the incline is 0.15. (a) What is the minimum magnitude of a force parallel to the incline that will prevent the crate from sliding down the incline? (b) What is the minimum magnitude of the force parallel to the incline that will start the crate to move up the incline? (c) Include a force (or free body) diagram of each situation.
6A. ficA donkey pulls a block across a rough horizontal surface at constant speed v by applying force F, as shown below. The arrows in the diagram correctly indicate the directions, but not necessarily the magnitudes, of the various forces on the block. Which of the following pairs of relations among the force magnitudes W, k, N and F must be true? a. F=k and N= W 1 p0ol boilgge ots (0) 3onol aoiton o (d) not lanoiinitveg o (o) i2e looge oma2 or N 10 ,wole stal ovom xod od 2o0 (b) b. F=k and N> W c. F=k and Nk and N= W F e. F>k and Nk and N>W g. FW i. F
4. A block of mass 3.00-kg is pushed against a wall by a force P that makes an angle of 50.0° with the horizontal as shown in the figure below. The coefficient of static friction between the block and the wall is 0.250. a. Determine the possible values for the magnitude of P that allow the block to remain stationary. P
1O C A cart for hauling ore out of a gold mine has a mass of 439 kg , including its load. The cart runs along a straight stretch of B Track track that climbs a shallow 4.75° incline. A donkey, which is Rope trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 441 N force for a distance of 185 m by means of a rope that is parallel to the slope but makes an angle of 14.5° with the track. A „Track incline Model the rolling resistance of the cart as though it were Horizontal ground sliding on the track with a coefficient of friction of 0.0163. Use g = 9.81 m/s, and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes %3D with the track. Find the work Wa that the donkey performs on the cart during this process. %3D Find the work W, that the force of gravity performs on the cart during this process. = "M Calculate the work W done on the cart by friction during this process. 87