Ascrew is a type of simple machine. if we look closely at a screw, we see that it is really a wrapped around a central core.

a) wedge
b) lever (b is incorrect)
c) fulcrum
d) inclined plane

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?