(c) the fraction of energy lost during the impact
Answer:
Initial kinetic energy will be 2608200 lbf-ft
Initial speed will be 240.7488 m/sec
Explanation:
We have given height h = 900 ft
Mass of the object m = 90 lbm
Acceleration due to gravity 
Initial kinetic energy will be equal to potential energy of the object
So kinetic energy = potential energy = mgh 
This energy is also equal to the initial kinetic energy
So 

So initial velocity will be 240.7488 m/sec
For the answer to the question above asking what is the primary determinant of the voltage developed by a battery?the answer is that the <span>the nature of the materials in the reaction that is the primary determinant of the voltage from a battery.</span>
Answer:

Explanation:
P = Power Output = 1000 W
r = Radius = 35000000 m
= Permittivity of free space = 
c = Speed of light = 
Intensity of Electric radiation is given by

Intensity of Electric radiation is given by

The amplitude of the electric field vector is 