Water flows through a horizontal pipe. the diameter of the pipe at point b is larger than the diameter of the pipe at point a. where is the speed of the water the greatest?
a. the speed of the water is the greatest at point b. b. the speed of the water is the same at both points. c. the speed of the water is the greatest at point a. d. the speed of the water cannot be determined without additional information.

C

Explanation:

Given

diameter of pipe at point B is larger than the diameter of the pipe at point A

using continuity equation

mass flow rate at A and B is same

as the density of the fluid is same so product of area of cross-section and velocity is same.

L.H.S is less than one so is greater than

does anyone know or what?

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s