A rope attached to an engine pulls a 839 N crate up an 18.0° ramp at constant speed. The coefficient of kinetic friction for the surfaces of the crate and ramp is 0.19. What is the magnitude of the force that the rope exerts on the crate parallel to the ramp?
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- A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20.The four forces acting on the block must be identified.Which forces act on the block? Kinetic frictional force Gravitational force Pushing force Static frictional force Normal force Tension2 crates are connected to each other by a rope. One crate(m=17kg) is sitting by the ledge of a cliff, and has a coefficient of friction between itself and the ground of 0.21. The second crate(m=11kg) is hanging off the edge of the cliff. Assuming that the hanging crate is heavy enough to pull the crate by the ledge to the right. Find a) and b) and Draw FBD for each crate a) The acceleration of the system b) The tension force that connects 2 crates together
- A desperate hiker has to think fast to help his friend who has fallen below him. Quickly, he ties a rope to a rock of mass ma and makes his way over the ledge (see the figure). If the coefficient of maximum static friction between the rock and the ground is µ, and the mass of the hiker is mâ, what is the maximum mass of the friend, mc, that the rock can hold so the hikers can then make their way up over the ledge? Assume the rope is parallel to the ground and the point where the rope passes over the ledge is frictionless. mc = JuA flatbed truck is carrying a 30-kg crate up a sloping road at a constant speed. The coefficient of static friction between the crate and the bed is 0.60, and the coefficient of kinetic friction is 0.25. What is the maximum angle of the slope that the truck can climb if the crate is to stay in place? Answer in degrees.Two workers are sliding 390 kg crate across the floor. One worker pushes forward on the crate with a force of 440 N while the other pulls in the same direction with a force of 240 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor?
- A 30 kg object sits on a table. The coefficient of static friction between the object and the table is 0.25. What frictional force must you overcome to make the object move?must be used? Ans: 39 N Question 12. A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 24.2° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 56.7 kg, and the coefficient of kinetic friction between the skis and the snow is 0.140. Find the magnitude of the force that the tow bar exerts on the skier. Ans: 299 N What is theA heavy crate is suspended from two ropes as it is lowered from a high shelf to the floor at a constant speed. One of the ropes makes an angle of 26.5 degrees with respect to the vertical and has a tension of 653 N, while the other makes an angle of 31.5 with respect to the vertical. What is the crate's mass in kg?
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