I would think it is B. The pitchblende sample contained an unknown radioactive element.
The physical change is that it changed shapes it never changed its chemical identity it would be different if the spring was rusted it's like how you can rip a piece of paper in half and it is still paper
<span>As it is descended from a vertical height h,
The lost Potential Energy = Mgh
The gained Kenetic Energy = (1/2)Mv^2; The rotational KE = (1/2)Jw^2
The angular speed w = speed/ Radius = v/R
So Rotational KE = (1/2)Jw^2 = (1/2)J(v/R)^2; J is moment of inertia
Now Mgh = (1/2)Mv^2 + (1/2)J(v/R)^2 => 2gh/v^2 = 1 + (J/MR^2)
As v = (5gh/4)^1/2, (J/MR^2) = 2gh/v^2 - 1 => (J/MR^2) = (8gh/5gh) - 1
so (J/MR^2) = 3/5 and therefore J = (3/5)MR^2.</span>
Answer:
Water!
Explanation:
Specific heat is described as the amount of energy required to raise one gram of a substance one degrees celcius. Therefore, the higher the number for specific heat the more energy that is required to raise the temperature of that object. Since 4.184 is greater than 1.760, more energy is required to heat water 1 degree celcius than wood!
gravitational Potential energy is given by
here we have
m = 200 kg
h = 21000 m
now we will have
so GPE of balloon will be 41160000 J above the given height from ground
