Given:
speed of 0.40meters/seconds
1,800 Newton's horizontal force
Required:
Power of the horse
Solution:
P = F(D/T) where P is power in
watts, F is the force, D is the distance and T is time
P = (1,800N) (0.40 meters/seconds)
P = 720 Watts
Answer:
Work done = 2218.97 kJ
Explanation:
Work = Force x Displacement.
Force = Weight of water.
Weight of water = Mass of water x Acceleration due to gravity.
Mass of water = Volume of water x Density of water.
Volume of water = Base area of swimming pool x Depth of water.
Base area of swimming pool
Depth of water = 1.5 m
Volume of water
Mass of water = 75.40 x 1000 = 75400 kg
Weight of water = 75400 x 9.81 = 739656 N
Work done = 739656 x 3 = 2218.97 kJ
Answer:
(c) reduce atmospheric blurring
Explanation:
Observatories are the locations used to study the celestial events, climate, astronomy etc. As the observations are made with the radio and visible light of the electromagnetic radiations. So in order to have the clear view, observatories are made at higher places far from population, in the dark areas having clear air, where they can clearly observe the sky. Atmospheric blurring is caused by the atmospheric turbulence. That cause the light coming from the stars to get slightly refracted thus effecting the results of the telescopes. In order to overcome it observatories are made at specific places like on the highest mountaintops.
