If a box with mass of 50 kg is moving on a rough surface with kinetic friction coefficient of 0.7, how much force is needed to keep the box moving? Group of answer choices   343 N   35 N   490 N   6.7 N

You are out on a hike and come across an unfortunate scene: a fellow hiker has fallen off a ledge. You happen to be carrying a long rope, and bravely decide to help. You tie the rope to a rock of mass mR=500 kgmR=500 kg and make your way over the ledge (see figure). If the coefficient of static friction between the rock and the ground is μS=0.355μS=0.355, and your mass is mH=70.5 kgmH=70.5 kg, what is the maximum mass of the fallen hiker (mFmF) that the rock can hold so that you two can make it back up from the ledge? Assume that where the rope passes the ledge is frictionless and that the rope is parallel to the ground.

Two blocks are connected by a string as in the figure and the system is released from rest. The coefficient of kinetic friction between Block A and the table is 0.3. Ignore the air resistance and friction between the pulley and the string. Find the tension in the rope. 12 kg Pulley m, = 12 kg 0. 82.3 N O 117.6 N 76.44 N 58.8 N

An acrobat standing on the lateral surface of a cylinder moves his legs and moves the cylinder with constant speed. The cylinder is on a rough (frictional) horizontal surface. If the coefficient of friction between the shoes and the cylinder is mu = 0.21 Determine the friction force between the cylinder and the stuntman. The mass of the stuntman is m=65 Kg.

A man is trying to pull a table with mass of 21 kg across the floor with a constant speed. What is the magnitude of frictional force when the coefficient of kinetic friction is 0.62. O 125.3 N O 13.02 N O 205.8 N O 132.7 N O 127.6 N

A shopper pushes a 7.7 kg cart at constant of 1.20 m/s speed along a rough horizontal surface by applying a force of 21.7 N at an angle of 36.5° below the horizontal. What is the coefficient of kinetic friction between the cart and the surface? v Fa 0.288 0.279 0.231 0.197

In the figure, two blocks are connected over a pulley. The mass of block A is 14.0 kg and the coefficient of kinetic friction between A and the incline is 0.140. Angle 0 of the incline is 42.0°. Block A slides down the incline at constant speed. What is the mass of block B? Frictionless, massless pulley A B Number i Units

Below are six crates at rest on level surfaces. The crates have different masses and the frictional coefficients between the crates and the surfaces differ. The same external force is applied to each crate, but none of the crates move. Rank the crates on the basis of the frictional force acting on them. Largest to smallest

In the figure, two blocks are connected over a pulley. The mass of block A is 8.50 kg and the coefficient of kinetic friction between A and the incline is 0.260. Angle e of the incline is 40.0°. Block A slides down the incline at constant speed. What is the mass of block B? Frictionless, massless pulley Number i Units

In the back of the truck is a 200kg box that has a coefficient of static friction of 0.8 and a coefficient of kinetic friction of 0.4 between the truck and the box. You are driving on the freeway at 25m/s. There is a car ahead of you that is driving at 30m/s. Your front bumper is 30m behind the back of the first car. You would like to pass the other car and pull back into the same lane when your back bumper is 10m ahead of the front bumper of the first car in 5 seconds. The length of the car ahead of you is 3m and the length of your car is 4m.a) What minimum acceleration do you need to do this?b) What distance does your car travel in that time?c) Does the box in your truck start to slide off the truck?