Which of the following statement about biofuels is NOT true?

a. Biofuel is a fuel made from living things.
b. Products previously considered waste can finding new life as biofuel.
c. Cooking waste oil is not considered as a biofuel.
d. The production and use of biofuel can lead to economic, industrial, social, and environmental issues.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

How would a small bar magnet be oriented when placed at position x?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c. what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?