Answer:
Bouyancy
Explanation:
Bouyancy occurs when the upthrust exerted on an object is equal to the weight of object displaced. It is mostly applicable to low density objects for example balloon. When balloon is displaced in water, it floats. This is due to the effect of the upthrust acting on the balloon which allows the balloon to float and which is opposite the weight.
Note that the weight acts downwards the object while the upthrust always acts opposite (upward)
Answer:
Explanation:
Initial speed, v = 10 x 10^3 m/s
Mass of the earth, M = 6 x 10^24 kg
Radius of the earth, R = 6.4 x 10^6 m
Maximum from the surface of earth, h = ?
Let m = Mass of the projectile
Solution:
Potential energy at maximum height = ( Potential + Kinetic energy ) at the surface
![-G M m / ( R + h )=- G M m / R + (1/2) m v^2](https://tex.z-dn.net/?f=-G%20M%20m%20%2F%20%28%20R%20%2B%20h%20%29%3D-%20G%20M%20m%20%2F%20R%20%2B%20%281%2F2%29%20m%20v%5E2)
![- G M / ( R + h ) = - G M / R + (1/2) v^2](https://tex.z-dn.net/?f=-%20G%20M%20%2F%20%28%20R%20%2B%20h%20%29%20%3D%20-%20G%20M%20%2F%20R%20%2B%20%281%2F2%29%20v%5E2)
![-2\times G M / ( R + h ) = ( - 2 G M / R ) + v^2](https://tex.z-dn.net/?f=-2%5Ctimes%20G%20M%20%2F%20%28%20R%20%2B%20h%20%29%20%3D%20%28%20-%202%20G%20M%20%2F%20R%20%29%20%2B%20v%5E2)
=![( (- 2\times 6.67\times10^{-11}\times6\times10^{24}) /(6.4\times10^6)} +10000^2](https://tex.z-dn.net/?f=%28%20%28-%202%5Ctimes%206.67%5Ctimes10%5E%7B-11%7D%5Ctimes6%5Ctimes10%5E%7B24%7D%29%20%2F%286.4%5Ctimes10%5E6%29%7D%20%2B10000%5E2)
=![-2.50625\times10^7 J](https://tex.z-dn.net/?f=-2.50625%5Ctimes10%5E7%20J)
![=- 8\times10^{14} / ( R + h )=-2.50625\times 10^7](https://tex.z-dn.net/?f=%3D-%208%5Ctimes10%5E%7B14%7D%20%2F%20%28%20R%20%2B%20h%20%29%3D-2.50625%5Ctimes%2010%5E7)
![R+h=31.92\times10^{6}](https://tex.z-dn.net/?f=R%2Bh%3D31.92%5Ctimes10%5E%7B6%7D)
![h=31.92\times10^{6}-6.4\times10^6](https://tex.z-dn.net/?f=h%3D31.92%5Ctimes10%5E%7B6%7D-6.4%5Ctimes10%5E6)
A. The efficiency of the ramp is 54.6 %.
<h3>Velocity ratio of the ramp</h3>
V.R = distance moved by effort/distance moved by load = L/h
V.R = (6.12)/(1.53) = 4
<h3>Mechanical advantage of the ramp</h3>
M.A = Load/Effort
M.A = (451 x 9.8)/(2025)
M.A = 2.183
<h3>Efficiency of the ramp</h3>
E = (M.A / V.R) x 100%
E = (2.183 / 4) x 100%
E = 54.6 %
Thus, the efficiency of the ramp is 54.6 %.
Learn more about efficiency here: brainly.com/question/15418098
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