Effort The diagram shows a lever of uniform mass supported at
the middle point. Six coins of equal mass are placed at
mark A on the left hand side.
А
B
(a) Can you balance the lever with 12 more coins of
equal mass? If yes, where would you place them? If
not why?
(b) With six coins still on the left, three coins are put on the right at mark B. Where on
the right should you pile an addition of six coins to get a balance?​

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

Carbon dioxide because it consists of one type of molecule.

Amperes. i got it right on edgenuity

The cell reaction uses external supplies of a full and an oxidant, which are consumed and needs to be provided continuously. the cell will continue to provide electrical energy so long as there is a supply of fuel and oxidant.  hope this ! (: