http://www.engineersedge.com/commercial_lumber_sizes.htm
It is: (5+2)*10 = 70
a 2x2x5 ecology block weighs 20
One liter weighs 1000 grams (1 Kg) 2 liters is twice that.
2
10 lbs.
2 1/2 tons
between 2-10 pounds
526 grams or 1.16 pounds
About 3-10 pounds.
2 pouns and 10 ounces
One spinach leaf is about 10 grams.
A 2 by 4 (lumber) will have a weight based on the density of the wood. Pine, fir, redwood, treated or untreated will have different densities.
It depends. They weigh equally if 2 blocks weigh as much as 1 marble. If 2 blocks are heavier, 10 blocks > 5 marbles If 1 marble is heavier, 10 blocks < 5 marbles
You do not have enough information to come up with an accurate answer. All wood does not weigh the same.
http://www.engineersedge.com/commercial_lumber_sizes.htm
It depends on what type of apples, though it should be around 2 kilos.