Answer:
(A) v2 = 17.7 m/s
(b) diameter = 1.73 mm
Explanation:
height of hole below the water level (h2) = 16 m
rate of flow (V) = 2.5 x 10^{-3} m^{3} / min = 4.17 x 10^{-5} m^{3}/s
(A) applying Bernoulli's theorem we can determine the speed of the water at the hole
where
p1 = pressure at the top surface
ρ = density of water
g = acceleration due to gravity = 9.8 m/s
v1 = velocity at the top
h1 = height at the top
p1 = pressure at the top surface
p1 = pressure at the hole
v2 = velocity at the hole
h2 = height of the hole from the top
- p1 and p2 are under atmospheric pressures and are hence both equal in magnitude to the atmospheric pressure (patm)
- the area of the top surface is very large compared to the area of the hole, hence velocity at the top v1 is very small compared to the velocity at the hole v2 hence the velocity at the top is negligible
- let the height of the top be L and the height of the hole from the top be L - 16
- applying this considerations to the equation we have
v2 =
v2 =
v2 = 17.7 m/s
(B) area = rate of flow / velocity
area =
area =
area = π()
diameter =2(
diameter =2(
diameter = 1.73 x 10^{-3} m = 1.73 mm
Answer:
rate
Explanation:
Note that speed has no direction (it is a scalar) and the velocity at any instant is simply the speed value with a direction.
Answer: Physical fitness can be defined as the ability of a person to perform daily routine tasks without any ailment.
Explanation:
Dance workouts can help in improving the physical fitness of the person.
This may involve improvement of the cardiovascular strength.
This may also help in improving the strength and endurance of a person.
This improves the stamina, flexibility, and composition of the body.
The dance also helps in maintaining balance and attaining the correct posture.
Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton. meter (N. ... One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m