a block of mass m  5.00 kg ispulled along a horizontal frictionless floor by a cordthat exerts a force of magnitude F = 12.0 N at anangle u = 25.0. (a) What is the magnitude of theblock’s acceleration? (b) The force magnitude F isslowly increased. What is its value just before theblock is lifted (completely) off the floor? (c) What isthe magnitude of the block’s acceleration just before it is lifted(completely) off the floor?

A jet airplane has an instantaneous acceleration of 1.99m /s^2 at an angle of 18.5^oabove the horizontal.Compute the horizontal and vertical components of force exerted on a 55.0kg passenger by the airplane seat?

A box is sliding along a slippery, horizontal floorat a constant speed of 5.0 m/s. It encounters arough patch on the floor. If the coefficient ofkinetic friction between the box and rough patchis 0.5, determine how far the box will travelbefore coming to a stop. The mass of the box is3.5 kg.

During strenuous exercise, it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction (in N) under such conditions? (The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.) she exert 67.0 kg of her mass on that knee?