A motorboat heads due east at 25 m/s across a river that flows due north at 12 m/s. a) Calculate the speed of the boat.

d) The river is 150 m wide. Calculate the time it takes the motorboat to reach the

other side.

b) Calculate the distance downstream the boat is when it reaches the other side of the

river.

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)