A10 kg box initially at rest is pulled with a 50 n horizontal force for 4 m across a level surface. the force of friction acting on the box is a constant 20 n. how much work is done by the gravitational force?
a. 10 j
b. 0 j
c. 50 j
d. 100 j

Which of the following is a compound? a. carbon b. oxygen c. hydrogen d. water

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

When the water vapor cools it condenses select a number that represents his process on the