Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff.

a. 98 j

b. 10 j

c. 980 j

d. the ball isn't moving, so the mechanical energy is zero.

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

Which is the most concentratic acid

How much energy is required to vaporize 2 kg of copper? a 4730 kj b 207kj c 9460 kj d 414kj