There are 4 significant figures in 9.0170. They are the 9, 1, 7, and the second 0.
There are three sig digs. The 2 zeros after the 369 do not count.
Four
2
Six - zeros between significant digits are significant.
4 of them.
7.3 lbs X 0.454 kg/pound = 3.3 kg to the justified number of significant digits. Algebraic Steps / Dimensional Analysis Formula 7.3 lb*1 kg 2.2046 lb=3.311224301 kg
0.20 Kg or 200 g Specific heat is 4186 J * Kg * Change in temperature of either K or C Thus Kg = 47000 J / (4186 J * 55 K) = .20 Kg The answer to four digits is 0.2041, but the amount of joules you have only has two significant figures, so the final answer would only have two significant figures.
2 Except that the fact that the figure is given as 3300 g instead of 3.3 kg suggests that the trailing 0s are significant.
4 digits
4
Six
4 of them.
Four
There are four.
There are four.
4 of them.
4 of them.
There are two sig figs in 8.4. (There would be two no matter what the units were, such as 8.4 kg for example.)
Non-zero digits are always significant. Thus, 569 has three significant digits, and 69.35 has four significant digits. Zeros are sometimes significant and sometimes aren't: # Zeroes placed before other digits are not significant; 0.0968 has three significant digits. # Zeroes placed between other digits are always significant; 70063 kg has five significant digits. # Zeroes placed after other digits but behind a decimal point are significant; 7.90 has three significant digits. # Zeroes at the end of a number are significant only if they are behind a decimal point as in (c). Otherwise, it is impossible to tell if they are significant. For example, in the number 8200, it is not clear if the zeroes are significant or not. The number of significant digits in 8200 is at least two, but could be three or four. To avoid uncertainty, use scientific notation to place significant zeroes behind a decimal point: 8.200 * 103 has four significant digits 8.20 * 103 has three significant digits 8.2 * 103 has two significant digits
Six - zeros between significant digits are significant.