3. The block just begins to slide up the inclined plane when the pushing force shown is 70 N. a. Find the normal force acting on the block. b. What is the static friction force on it? c. What is the value of the coefficient of static friction? 70 N 60 N 40 40
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- (a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is the total force on the cat ? (b) What is the total force on the cat if it is moving to the left?A 10 kg box is on the horizontal surface with an exerting force of 95.3 N to start a box in the horizontal surface. a. Calculate the coefficient static friction. b. If the box continues to move with an acceleration of 1.71 m/s. What is the kinetic friction.An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 6000 N. When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N drag force.a. What was the tension in the cable when the craft was being lowered to the seafloor?b. What was the tension in the cable when the craft was being raised from the seafloor?
- An orthodontist places 35 pounds of tension on the wire across your teeth.The insicor is just forward so that the wire is bent at 15 degrees on either side. a. What net force does the wire apply to the tooth? b. The tooth shifts and the ledt angle becomes 10 degrees while the right angle becomes 20 degrees. Assuming that the tension stays the same, what force is now applied to the tooth?A block is placed on a 10° incline plane. The block has a mass of 150kg. The coefficient of static friction on all surfaces of contact is equal to 0.23. 92. What is the value of the normal force present in the block? a. 1449.14 N b. 1255.52 N c. 921.84 N d. 1382.76 N 93. What is the value of the frictional force present in the block? a. 195.4 N b. 273.9 N c. 283.9 N d. 276.55 N 94. Determine the minimum force along the plane that needs to be exerted on the block to keep it from moving. a. 58.97 N b. 612.07 N d. 173.9 N c. ON 95. What horizontal force should be exerted on the block to impend motion up the plane? a. 699.17 N b. 713.11 N c. 516.13 N d. 678.57 N21. A child pushes a 315 g toy truck across a horizontal rough surface. (coefficient of kinetic friction, ux = 0.73). a. Draw a formal free-body diagram of the toy truck if it is being pushed horizontally to the right. b. What total force must the child apply to push the truck at a constant speed? 22. A 1600 g tool is thrown at 15.0 m/s, 40° above the horizontal from the top of an 80.0 m building under construction. How long does it take to hit the ground? Draw a vector diagram
- A box of mass ?= 5.00 kg is at rest on a horizontal rough surface. The coefficients of static friction and kinetic friction between the surface and the box are μ?= 0.450 and μ?= 0.400, respectively. Then, a horizontal force ?⃗ is exerted on the box. a. If the magnitude of the force ?⃗ is 12.0 N, what is the magnitude of the friction force on the block? b. If the magnitude of the force ?⃗ is 25.0 N, what is the magnitude of the acceleration of the block?A 60 kg block rests on a rough plane inclined at 30 deg with the horizontal. The coefficient of sliding friction between block and plane is 0.15. What force P parallel to the plane is required to keep the block moving up the plane at constant speed? a. 88 N b. 218 N c. 294 N d. 370 NYou need to push a couch 4 m to the other side of the room. After the initial push to get it going you push on the 90kg couch with a steady horizontal force of 600 N. The coefficient of kinetic friction between the couch and the floor is 0.6. 1. What is the magnitude and direction of the frictional force on the couch? 2. What is the magnitude and direction of the net force on the couch? 3. What is the magnitude and direction of the acceleration of the couch?
- A box with a mass of 56.5 kg is placed on a ramp that is inclined at 27.3° from the horizontal. The coefficient of static friction is 0.565 and the coefficient of kinetic friction is 0.325. a. Determine the acceleration of the box the moment it is placed on the ramp. b. In order for the box to just start moving up the ramp, what force must be applied and in what direction? c. In order for the box to move up the ramp with a constant velocity, what force must be applied and in what direction? d. In order for the box to move down the ramp with a constant velocity, what force must be applied and in what direction?2. A 1,480-N crate is being pushed across a level floor at a constant speed by a force F of 370 N at an angle of 20.0° below the horizontal, as shown in the figure a below. The floor has some amount of friction. 20.0° a a. Draw a free body diagram of all the forces on the crate. b. Write out one equation for the y component of the resultant force. Hint: The crate does not move in the y direction. Write out one equation for the x component of the resultant force. Hint: the crate moves in the x direction. C. d. Determine the Normal force. e. What is the coefficient of kinetic friction between the crate and the floor? (Enter vour answer to at least three decimal places.)A stationary 15 kg object is located on a table near the surface of the earth. The coefficient of static friction between the surfaces is 0.40 and the coefficient of kinetic friction is 0.25. 11. A horizontal force of 40 N is applied to the object. a. Draw a free body diagram with the forces to scale. b. Determine the force of friction. c. Determine the acceleration of the object. 12. A horizontal force of 60 N is applied to the object. a. Draw a free body diagram with the forces to scale. b. Determine the force of friction. C. Determine the acceleration of the object.