A 5kg trolley is pushed along a horizontal surface with a orce 45° to the horizontal. The trolley experiences a constant frictional force of 60 N. 150 N 45° abst 03
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- A block of mass 1.96kg is accelerated across a rough surface by a rope passing over a pulley, as shown in the figure below. The tension in the rope is 14.0N, and the pulley is 10.8cm above the top of the block. The coefficient of kinetic friction is 0.350. Calculate the value of x at which the acceleration becomes zero.I'm trying to find out number 17A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal. If the coefficient of kinetic friction between the box and the plane is 0.4, what is the magnitude of the force that must be applied parallel to the incline to keep the box moving down the incline at a constant speed?
- Many birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?A feather falls at constant velocity a vertical distance of 123.8 m. If the mass of the feather is 39.04 g then(a) how much is done by gravity, and (b) air resistance?A 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?
- 3. A base year student with a mass of 85 kg slides on a surfboard down the stairs in NI:0E11 with a constant speed of 3.0 m/s. The stairs have an angle of 15.0 degrees to the ground. (a) Free the surfer (ie the surfer and the teacher as a unit). (b) Calculate the frictional force.A 22-kg crate is on an incline that makes an angle of 30° with the horizontal. If the coefficient of static friction is 0.50, the minimum force that can be applied parallel to the plane to hold the crate at rest is:A 9.61kg box on a ramp with an incline of 26.36° slips, giving it an acceleration of 0.31m/s2. What is the coefficient of kinetic friction between the box and the ramp?