A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1400 N and the angle between the two ropes is 50 ●. Assume both players pull with the same force. How hard must each player pull to drag the coach at a steady 2.0 m/s?

An 80 kg log is sliding along a flat section of ground at constant velocity with a coefficient of kinetic friction of 0.33. A truck is dragging the log by using a cable that runs from a winch on the truck to the end of the log. The cable pulls at an angle of 30 degrees above the horizontal. What is the tension of the cable?

while looking for a set of new tires for your car, you find an advertisement that offers two brands of tires, brand x and brand y, at the same price. Brand x has a coefficient of friction on dry pavement of .90 and on wet pavement of .15. Brand y has a coefficient of friction on dry pavement of .88 and on wet pavement of .45. If you live in an area with high levels of precipitation, which tires would give you better service? Explain.

A 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.

there is an object with mass of 70 kg, you are pulling it with a rope angled at 28 degrees up with respect to the horizontal floor.  the coefficient of static friction is 0.50  how hard should you pull to make the object move?

A tow-truck pulls a 1500 kg car using a steel cable that makes a 25° angle with the horizontal,as shown in the figure below. The maximum allowable tension in the cable is 11, 000 N. Thecoefficient of kinetic friction between the wheels of the car and the road is 0.65. The truck and car are traveling along the flat, straight road. What is the maximum allowable acceleration of the tow-truck as it pulls the car?

You are pulling on a box (that has a 5.9 kg mass) by using a rope, pulling upward with a force of 7.2 N at an angle of 28.1°. If the box is moving across the ground at a constant speed of 11.6 m/s, what is the coefficient of kinetic friction? Your Answer: Answer

A single-celled animal called a paramecium propels itself quite rapidly through water using its hair-like cilia. A certain paramecium experiences a drag force of Fdrag -bu? in water, where the drag coefficient b is approximately 0.330 kg/m. If the paramecium's speed v is 0.000157 m/s, what is the magnitude of the propulsion force that the creature must generate to move at this constant speed? -9 magnitude: 2.684 x10° N

Two blocks A and B with mA = 1.1 kg and mB = 0.88 kg are connected by a string of negligible mass. They rest on a frictionless horizontal surface. You pull on block A with a horizontal force of 6.7 N. How will the tension in the string be affected if mA is decreased?

Two children are pulled on a sled over snow-covered ground. The sled is pulled by a rope that makes an angle of 35° with the horizontal. The children have a combined mass of 45 kg and the sled has a mass of 5.0 kg. The coefficients of static and kinetic friction are u, = 0.20 and µ, = 0.15. Calculate the maximum possible force of static friction between the sled and snow. If the tension in the rope is 95 N, will the sled move? Justify your answer.