7.4 grams
A complete GM Ecotec engine will weigh about 300 pounds. This of course is the complete engine, down to the bolts and all.
About 3 gm.
50 gm
Modern "golden" dollars and Anthony dollars weigh 8.1 gm All US paper bills weigh 1 gm
Modern copper-nickel dimes weigh 2.27 gm. Older (1964 and earlier) 90% silver dimes weighed 2.5 gm.
260
About 500 gm.
That is approximately 5 gm.
That is 13-13.5 gm
Assuming "100" means "$100", there are 20 nickels in a dollar so $100 is 2000 nickels. US nickels weigh 5 gm so 2000 of them weigh 5*2000 = 10,000 gm, or 10 kg. Current Canadian nickels weigh 3.95 gm so 2000 of them weigh 3.95*2000 = 7900 gm, or 7.9 kg.
assuming water with density 1 gm/cc 550 cc = 550 gm
Modern copper-plated zinc cents weigh 2.5 gm or about 0.09 oz. Older bronze cents (mid-1982 and earlier) weigh 3.11 gm or approx 0.11oz