For a drag force of the form F = - bv, what are the units of b?
A 1.5-kg block rests on top of a 7.5-kg block. The cord and pulley have negligible mass, and there is no significant friction anywhere.
(a) What force F must be applied to the bottom block so the top block accelerates to the right at 2.6 m/s2 ?
(b) What is the tension in the connecting cord?
A fisherman in a boat is using a "10-lb test" fishing line. This means that the line can exert a force of 45 N without breaking (1 lb = 4.45 N).
(a) How heavy a fish can the fisherman land if he pulls the fish up vertically at constant speed?
(b) If he accelerates the fish upward at 2.1 m/s2 , what maximum weight fish can he land?
(c) Is it possible to land a 15-lb trout on 10-lb test line? Why or why not?
A 7700-kg helicopter accelerates upward at 0.75 m/s2 while lifting a 1300-kg frame at a construction site.
(a) What is the lift force exerted by the air on the helicopter rotors?
(b) What is the tension in the cable (ignore its mass) that connects the frame to the helicopter?
(c) What force does the cable exert on the helicopter?
A wet bar of soap (m= 150 g) slides freely down a ramp 3.1 m long inclined at 9.0 .
How long does it take to reach the bottom?
How would this change if the soaps mass were 300 g?