# Physics questions

1.Write the following numbers in scientific notations with the appropriate number of significant digits:

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a.172.0 =

b.0.0023 =

c.8.032 =

d.0.103 =

2.Perform the operations and write the answers in scientific notation with the appropriate number of significant digits:

a.27.39 x 0.0320 =

b.62.304/2.93 =

c.0.032 + 12.19 =

d.(7.30 â€“ 5.1)/12.083 =

e.(39.04 + 16.317)/(0.0341 + 0.207) =

3.Convert: (write the answer with the correct number of significant digits)

a.329.6 cm3 = m3

b.62.7 mi/s = m/s

c.0.72 yard3 = m3

4.A house painter uses a 9.0 inch wide â€œrollerâ€ which is 5.0 inches in diameter to paint a wall surface 2.40 m x 6.70 m. The surface includes 2 windows (2.0 ft x 3.0 ft each) which, obviously, should not be painted. What is the minimum number of times that the painter has to roll his â€œpaint rollerâ€ (one full circle for each roll) in order to apply one layer of paint on the surface to be painted?

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