If you have to push a 16 kg crate with a force of 32 N to get it to start sliding across the ground, what is the static coefficient of friction? 0.20 0.43 4.9 0.52
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- A 40-N crate rests on a rough horizontal floor. A 12-N horizontal force is then applied to it. If the coefficients of friction are ls = 0.5 and uk = 0.4, the magnitude of the frictional force on the crate is: O 40 N 8 N O 12 N O 20 N O 16 N Submit AnswerA push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle 0 below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to: O W + P cos 0. O W + P sin 0. OW-P sin 0. O W + P. O W. W 0 PA 2.00-kg block is at rest on a horizontal plank that is 1.50 m long. When one end of the plane is raised to 0.50 m, the block starts sliding down. What is the coefficient of static/starting friction between the block and the plank? O 0.43 O 0.35 0.33 O 0.53
- A 235 N crate rests on a ramp; the maximum angle just before it slips is 27.8° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces? Answer:Two objects, A and B, are placed on an inclined plane that can be rotated to different angles of elevation. A starts to slide at twice the angle of elevation that B starts sliding. The respective coefficients for static friction for A and B are us and up. Choose the last answer that is correct. Select one: O a. HA = 2µB O b. HB > HA O c. HB = 2µA O d. HA > HBb) A girl exerts a 36-N horizontal force as she pulls a 52-N sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance. Hint: Fk whe 9 M
- You want to move a 150kg crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal ford What is the coefficient of static friction? O None of the choices 0.46 0.156 0.652A 98N force is needed to push a 45kg box across the wooden floor. What is the value of the coefficient of static friction across the floor and the box? O 0.212 O 0.222 O No answer O 0.122 O 0.012A 100kg box is at rest on a 10◦ ramp and is being held up by the force of static friction. What is the minimum coefficient of static friction between the box and the ramp to make sure that the box doesn't slip?
- Consider the figure shown in the following figure. You are loweringtwo boxes, one on top of the other, down a ramp by pulling on a ropeparallel to the surface of the ramp. Both blocks move with constantvelocity of 10.0 [m/s]. The coefficient of kinetic friction between theramp and the lower box is 0.555 and the coefficient of static frictionbetween the two boxes is 0.750. A. Draw the Free-Body diagram of both blocks. Set the ?-axis parallel to the ramp. B. Write Newton’s 2nd law along the ? and ? directions for both blocks considering their state of motion (accelerations). C. What are the magnitude and direction of the frictional force on the upper box? D. What is the magnitude of the applied force? E. Determine the angle at which the top block will start to slide down the bottom block.Consider the figure shown in the following figure. You are loweringtwo boxes, one on top of the other, down a ramp by pulling on a ropeparallel to the surface of the ramp. Both blocks move with constantvelocity of 10.0 [m/s]. The coefficient of kinetic friction between theramp and the lower box is 0.555 and the coefficient of static frictionbetween the two boxes is 0.750. A. Draw the Free-Body diagram of both blocks. Set the ?-axis parallel to the ramp. B. Write Newton’s 2nd law along the ? and ? directions for both blocks considering their state ofmotion (accelerations). C. What are the magnitude and direction of the frictional force on the upper box? D. What is the magnitude of the applied force? E. Determine the angle at which the top block will start to slide down the bottom block.You are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85kg, and you need to exert a force of 3.3*10^2 N to make it just begin to move. a)Determine the coefficient of static friction between the floor and the trunk.b)After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0m/s after 5.0s. Calculate the acceleration of the trunk if the coefficient of kinetic friction between the trunk and the floor is 0.32.