Calculate the Gravitational Potential Energy of 5000kg roller coaster on the top of a 139m lift. PE = mgh, g = 9.8m/s^2. Round your answer to a
whole number

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem