In the figure a fastidious worker pushes directly along the handle of a mop with a force 7. The handle is at an angle 0-42" with the vertical, and u, -0.68 and p-0.49 are the coefficients of static and kinetic friction between the head of the mop and the floor. Ignore the mass of the handle and assume that all the mop's mass m-0.73 kg is in its head. (a) If the mop head moves along the floor with a constant velocity, then what is F? (b) If @ is less than a certain value 0. then 7 (still directed along the handle) is unable to move the mop head. Find (a) Number (b) Number Units Units

a 70 kg box sits on a level surface where the coefficient of static friction is 0.3. what is the minimum force applied at 55 up from the horizontal needed to start the mass moving ?

(Ch 04 HW Problem 4.90 13 of 2: Consta A 28.0-kg block is connected to an empty 2.12-kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.45 and the coefficient of kinetic friction between the table and the block is 0.30. Sand is gradually added to the bucket until the system just begins to move. Ignore mass of cord. (Figure 1) Part A Calculate the mass of sand added to the bucket. Express your answer to two significant figures and include the appropriate units. m = Value Units Submit Request Answer Part B Figure Calculate the acceleration of the system. 28.0 kg Express your answer to two significant figures and include the appropriate units. ? a = Value Units MacBook Pro G Search or type URL #3 & 4 7 W Y S D F H J V command option mand V

A 6.7 kg mass is released from rets while on an incline of 53.96 degrees. If the coefficient of kinetic friction is 0.478 what is the magnitude of the acceleration of the mass?

Enter an expression for the magnitude of the force of the bottom-most parcel on the center parcel valid for any value of the vertical acceleration, ay, using only the parameters provided in the palette

A 375-lb block rests on a rough plane inclined 35o with the horizontal. If thecoefficients of friction between the block and the plane are 0.58 for static and 0.3 for kinetic respectively, determine whether or not the block is at rest.

A mass of 500 kg sits on a level surface where the coefficient of static friction is 0.5. What is the minimum force applied at 600 up from the horizontal needed to start the mass moving?

A 1.5 kg block resting ina rough flat surface is pulled by a string.  The string makes an angle of 20 degress with the horizontal.  The coefficient of static friction between the blodk and the surface is 0.35.  What is the maximum tension in the string to keep the block unmoved?