A = 250 m wide river flows with a uniform speed of = 4.0 m…

A = 250 m wide river flows with a uniform speed of = 4.0 m/s toward the east. I take off from the south bank in a boat that moves at = 6.0 m/s with respect to the water to arrive at point on the north bank directly north of my launch. What heading did my boat have to make the journey?

The three blocks shown are released from rest and are observ…

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let the mass of the small block be  = 2.0 kg. The two other blocks have double this mass.