1. The rotating blade of a hovering helicopter sweeps out an area of radius 4m imparting a downward velocity of 12ms^-1 to the air displaced. Find the mass of the helicopter.
(g=10ms^-2, density of air= 1.3 kgm^-3)
The Attempt at a Solution
F=d/dt(mv)
F= (density of air*volume)*12
=...
At zero acceleration it would be 750N,
I cannot understand how to work out problems when acceleration is involved, even after consulting some worked examples in the book. For example problems which involve elevators and finding the weight of an object while accelerating, finding acceleration...
1. What is the weight of an astronaut during lift off, if his actual weight is 750N and the acceleration of the craft is 5g's.
The way I tried to solve it:
F=ma
F= 75(50)
But answers are not matching, as the answer should be 4500N.
I think I am missing something with that has to do with...
Just to know...??
This is no homework,, this is just my effort trying to solve this out...
If we ever succeed to transfer electrical power without the use of wires (conduction) would that mean that the speed of light is reached? And If your answer is no, then how come the electric power that...