Problem 4 Water is flowing in a pipe with varying cross-sectional area. At the point A, where the cross
sectional area of the pipe is 0.0700 m2
, the velocity of the water is 3.50 m/s. Compute:
a) The speed of the water at point B, where the cross-sectional area of the pipe is 0.105
m2
;
b) The speed of the water at point C, where the cross-sectional area of the pipe is 0.0470
m2
;
c) The rate at which water flows in the pipe (in m3/s);
d) If point B is 10.0 m below point C, what is the difference in pressure between point B
and point C?

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.