A 2.00 kg-ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero.
c. -196 J.
b. 196 J.
d. 392 J.
Question 2
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which steps does the internal energy of the system increase?
a. 1 and 2
c. 1 and 3
b. 3 and 4
d. 2 and 4
Hydrogen sulfide as an energy source for chemoautotrophic bacteria in the deep sea.
Comet Tempel 1 67 seconds after colliding with the Deep Impact probe.
The action potential.
U.S. Energy Consumption
Deep vibration applied with fingertips to the abdomen.
The oceans have absorbed 90% of excess energy