Suppose a 4,000-kg elephant is hoisted 20 m above Earth’s surface. What will the elephant’s gravitational potential energy be? (Show your work in the space below.)

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.