Which statement best defines work? (2 points) Group of answer choices Work is the time it takes to move an object once acted upon by a force. Work occurs when balanced forces act on an object and cause movement in the direction of these forces. Work occurs when a force causes motion of an object, and this motion is in the same direction of the applied force. Work is the distance over time that an object moves once acted on by a force.

Acid rain is caused by human activity. select the best answer from the choices provided t f

Use henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.7 l of water upon warming from 25 ˚c to 50 ˚c. assume that the water is initially saturated with nitrogen and oxygen gas at 25 ˚c and a total pressure of 1.0 atm. assume that the gas bubbles out at a temperature of 50 ˚c. the solubility of oxygen gas at 50 ˚c is 27.8 mg/l at an oxygen pressure of 1.00 atm. the solubility of nitrogen gas at 50 ˚c is 14.6 mg/l at a nitrogen pressure of 1.00 atm. assume that the air above the water contains an oxygen partial pressure of 0.21 atm and a nitrogen partial pressure of 0.78 atm.

Inside stars in space, the nuclei of hydrogen atoms fuse together to form helium atoms. this represents which form of energy? electrical energy nuclear energy chemical energy radiant energy