4. a person can swim 0.65 m/s in still water. she heads directly south across a river 130 m wide and lands at a point 88 m [w] downstream. k/u t/i a (a) determine the velocity of the water relative to the ground. (b) determine the swimmer’s velocity relative to earth. (c) determine the direction she should swim to land at a point directly south of the starting point.

speed of the person in still water = 0.65 m/s

width of the river = 130 m

distance covered downstream = 88 m

a) let the speed of the water be  = s

The time to cover two displacements would be equal.

b) Swimmer's velocity  relative to earth would be:

c) The swimmer should swim south of East to land at a point directly south of the starting point.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

answera compound;