When the three blocks in the figure below are released from rest, they accelerate with a magnitude of 0.290 m/s². Block 1 has mass M, block 2 has 8M, and block 3 has 8M. What is the coefficient of kinetic friction between block 2 and the table?
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- Three blocks, light connecting ropes, and a light frictionless pulley comprise a system, as shown in the figure. An external force of magnitude P is applied downward on block A, causing block A to accelerate downward at a constant 2.5 m/s2. The tension in the rope connecting block B and block C is equal to 60 N. What is the magnitude of the force P? What is the mass of block C? Please include detailed answers with net force equations.Three stacked blocks are placed in an elevator as shown: Assume the stack of blocks is in contact with the floor of the elevator. If m = 11.9 kg and the elevator is accelerating upward at 1.9 m/s2, what is the normal force exerted on the 5m block by the 8m block? Express your answer in N, to at least one digit after the decimal point.The 2.0 kg wood box in the figure (Figure 1) slides down a vertical wood wall while you push on it at a 45 ∘ angle. The coefficient of kinetic friction of wood on wood is μk = 0.200. What magnitude of force should you apply to cause the box to slide down at a constant speed?
- A 1,040-N crate is being pushed across a level floor at a constant speed by a force F of 400 N at an angle of 20.0° below the horizontal. (a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.) (b) If the 400-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).Consider the system shown in the figure (Figure 1). Block A weighs 45.1 NN and block B weighs 24.6 NN . Once block B is set into downward motion, it descends at a constant speed. 1. Calculate the coefficient of kinetic friction between block A and the tabletop. 2. A cat, also of weight 45.1 NN , falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration magnitude?A window washer pushes his scrub brush up a vertical window at constant speed by applying a force F⃗ as shown in (Figure 1). The brush weighs 13.9 N and the coefficient of kinetic friction is μk = 0.140. Calculate the magnitude of the force F⃗ . F = ? Calculate the normal force exerted by the window on the brush. n = ?
- You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 16.0 cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.444, and the coefficient of static friction between the two boxes is 0.809. What force do you need to exert to accomplish this?The block shown in figure #1 above has a mass of 4.30 kg. The applied force (? ⃑ ) has a magnitude of 31.2 N and is 32.0° above the horizontal, frictionless surface the block in on. a. What is the normal force (magnitude and direction) that acts on the block? b. What is the acceleration (magnitude and direction) that is experienced by the block?Three forces of magnitudes F1=4.0N, F2=6.0N, and F3=8.0N are applied to a block of mass m=2.0kg, initially at rest, at angles shown on the diagram. (Figure 1)In this problem, you will determine the resultant (net) force by combining the three individual force vectors. All angles should be measured counterclockwise from the positive x axis (i.e., all angles are positive). A.) What is the magnitude of the block's acceleration vector, a⃗ ? B.) What is the direction of a⃗ ? In other words, what angle does this vector make with respect to the positive x axis? C.) How far (in meters) will the block move in 5.0 s? Recall that it starts from rest.
- Consider the system shown in the figure. Block A weighs 40.7 N and block B weighs 31.0 N. Once block B is set into downward motion, it descends at a constant speed. a. Calculate the coefficient of kinetic friction between block A and the tabletop. b. A cat, also of weight 40.7 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration magnitude? c. A cat, also of weight 40.7 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration direction?Box A (mass 50 kg) and box B (mass 200 kg) shown in Figure 8 are released from rest. Here the mass of pulleys is ignored. Ignore the friction between box A and box B, and the coefficient of copper friction between box B and slope is 0.2 degrees and the angle of slope is 20 degrees. Answer each of the following questions:1) Calculate the acceleration (m/s^2) of box A.2) Find the tension size (kgf).3) When Box B moves 1.5m, calculate the speed (m/s) of Box B using Newton's 2nd law.4) When box B moved 2m, calculate the speed (m/s) of box A using the modified energy supply law.Three blocks A, B, and C stand next to each other as shown in the figure. A force F is applied to push block C directly and sends the blocks accelerating to the right with acceleration of 10 m/s2. Let's assume there is no friction between the blocks and the ground. The mass of A, B, and C are 12.300, 89.200, and 154.100 kg, respectively. What is the force applied on block C by block B (in unit of N)?