A horizontal pipe carrying water tapers from 200mm diameter
at point A to 100mm diameter at point B. If the volume flow
rate is 55 litres/second find the pressure difference between
the points A and B neglecting any losses in the pipe.

Delta pressure = 45938[Pa]

Explanation:

This is a classic bernoulli equation problem, but first we must find the velocity at both ends of the pipe, knowing the diameters of each end.

Now we can calculate the two velocites VA and VB

Using the bernoulli equation we have:

Where ro = density of water = 1000[kg/m^3]

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:

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation: