A window washer pulls a rubber squeegee down a very tall vertical window. The squeegee has mass 170 g and is mounted on the end of a light rod. The coefficient of kinetic friction between the squeegee and the dry glass is 0.650. The window washer presses it against the window with a force having a horizontal component of4.50 N.
(a) If she pulls the squeegee down the window at constant velocity, what vertical force component must she exert?
| magnitude | N |
(b) The window washer increases the downward force component by 40.0%, while all other forces remain the same. Find the squeegee’s acceleration in this situation.
| magnitude | m/s2 |
(c) The squeegee is moved into a wet portion of the window, where its motion is resisted by a fluid drag force R proportional to its velocity according to R =-18v, where R is in newtons and v is in meters per second. Find the terminal velocity that the squeegee approaches, assuming the window washer exerts the same force described in part (b).
| magnitude | m/s |
