Answer: The correct answer is 912 A
Answer:I believe it is D I might be wrong
Explanation:
let the mass of the two objects be m₁ and m₂ respectively and the distance between the two objects be "r₁" initially.
the gravitational force between the two objects initially is then given as
F₁ = G m₁ m₂ /r₁² eq-1
where G = universal gravitational constant
when the objects are moved closer and the distance between the objects become one third of the original distance, hence
r₂ = distance after objects moved closer = r₁/3
new gravitational force between the objects after they are moved closed is given as
F₂ = G m₁ m₂ /r₂² eq-2
dividing eq-2 by eq-1
F₂/F₁ = (G m₁ m₂ /r₂² )/(G m₁ m₂ /r₁²)
F₂/F₁ = r₁²/r₂²
we know that , r₂ = r₁/3
hence
F₂/F₁ = r₁²/(r₁/3)²
F₂/F₁ = 9
F₂ = 9 F₁
hence the gravitational force becomes nine times its initial value
Answer:
Explanation:
a ) Applying law of conservation mechanical energy
1/2 mv² = mgh
v =√ 2gh
= √ 2 x 9.8 x 3
= 7.67 m /s
b ) Applying law of conservation of momentum
m x 7.67 = ( m + 2m ) v
= 3m v
v = 2.55 m /s
In perfectly inelastic collision , mechanical energy is not conserved.
Initial kinetic energy
= 1/ 2 x m x v²
= .5 x m x 58.8
= 29.4 m
Kinetic energy after collision
= .5 x 3m x (2.55) ²
= 9.75375 m
Loss of kinetic energy
= 19.646 m
-
Answer:
Solid materials that do not possess an orderly arrangement of atoms are called glasses (mineraloids).
Explanation:
A Mineraloid is a natural, inorganic, amorphous (lacking "defined chemical composition") solid body that does not exhibit crystallinity. It exhibits characteristics similar to those of minerals, but does not have the "ordered atomic structure" necessary to meet the definition of a mineral.
Glasses or colloids have a totally random structure on an atomic scale. They are amorphous and get the honorary name of mineraloid.
<u><em>Solid materials that do not possess an orderly arrangement of atoms are called glasses (mineraloids).</em></u>