A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i.e., it is supported by an upward force o
f 100 N). How much work was done in lifting the crate from the ground to its final position? 1. 150 J2. No work was done.3. None of these4. More than 150 J5. A bit less than 150 J
A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power.
