Sig Figs and Conversion

1. Dec 5, 2008

cbrowne

Hey I dont want to loose points for this primary question, could someone please go over my answers. Thanks!

1. The problem statement, all variables and given/known data

1. Perform the following operations and write your answers with appropriate
number of significant figures: (a) 589.01−89.020 (b) 1.0×9.00 (c) 180 /pi
(d) 180.0 /pi (e)3.901x10-5+ 1.0x10-7

2. Perform the following unit conversions and express the answer in scientific
notation: (a) 0.510 kg to g (b) 92 mi to km (c) 3 0.50 m to 3 cm (d) 15 μs to ms
(e) 60.0 km/h to m/s

3. The attempt at a solution

a) 589.01-89.020 = 499.99
b) 1.0 x 9.00 = 9.0
c) 180/ Π = 57
d) 180.0/Π = 57.30
e) 3.901 x 10^-5 + 1.0 x 10^-7 = 0.00004

2. a) 0.510kg x 1000g/1kg= 5.1 x 102g

b) 92 mi x 1.609344km/1mi= 1.48059 x 102 km

c) 0.50m3 x 1 000 000cm3/ 1m3 = 5 x 105 cm3

d) 15μs x 1ms/0.001 μs = 1.5 x 10-2ms

e) 60.0km/1hour = 65000m/3600 sec = 1.805556 x 101 m/s
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Dec 5, 2008

Joskoplas

1e looks reeaall suspicious.

If I multiplied both numbers by 10^7 (for my convenience), I'd see 390.1 + 1.0

I don't have to convert it back to the proper decimal place to see there's a problem with saying 400

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