Question

pls answer pls answer​

Answer 1

a) Whipped Cream, Soap lather.

b) Jellies, Butter.

c) Paints, Cell fluids.

d) Pumice stone, Foam rubber.

Answer 2

Explanation:

We know that the escape velocity of Earth = Ve = √[2gR]

       g = gravity due to Earth

      1/2 m (Ve)² - G Mm/R = 0   for the object to escape from Earth.

       (or,  KE + PE = 0)

When the body is projected from Earth's surface:

     Given  u = initial velocity = Ve /2 = √(gR/2)

     Initial  KE = 1/2 m u² = m g R/4 = G M m /(4R)

     Initial  PE = - GMm/R

     Total initial energy = - 3 GMm /(4R)

 When the body reaches a height h above surface of Earth and stops:

     v = 0. Final KE = 0.

     Final PE = - G M m/ (R+h)

From conservation of Energy:

           - GMm/(R+h) = - 3Gm/ (4R)

            3 (R+h) = 4 R

              h = R/3

Answer is R/3.