Plaque in an artery: the buildup of plaque on the walls of an artery may decrease its diameter from 0.98 cm to 0.75 cm. if the speed of the blood (rhoblood = 1060 kg/m3 ) flow was 10 cm/s before reaching the region of the plaque buildup, find the speed of the blood flow in the plaque region. assume both regions have a roughly circular cross-section

To solve this problem it is necessary to apply the concept related to continuity equations and fluid pressure changes.

Where

= Cross-sectional Area at each section

= Velocity at each section

Rearranging to find the value of the velocity at section 2 is

The velocity at the end is 17.07cm/s

Finally the pressure change can be expressed as:

Replacing we have,

Therefore the total change at pressure is 10.14Pa

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:

see earlier