Answer:
h=32.1 km
Explanation:
<em>solution:</em>
using newton law of gravitational attraction and newton second law:


r= distance between two masses
at sea level
a=g

.............................(1)
.........................(2)
by substituting (2) and (1)
acceleration due to gravity at a distance r from the centre of the earth in terms of g (sea level)
so the weight of the object at a distance r from the centre of the earth (W=ma)
W=mg(Re^2/r^2)..........(3)
h the height above the surface of the earth: r=Re+h
putting the value of r in eq (3)
W=mg(Re/Re+h)^2
W=0.99 mg
solving for height h:
h=Re(1/√0.99)-(1))
h=32.1 km
Answer:
It will take the steel 425.925sec to cool from 1150k to 400k
Explanation:
Detailed explanation and calculation is shown in the image
Answer:
Human powered generators are the best energy source for the rescue team as it doesn't require any lengthy time consuming resource but only the power of single human being. Just like fossil fuels, the human power is a kind of renewable energy source that does no harm to the environment and can be used whenever required.
Explanation: