Review before starting Phys 20

How many significant digits are in 0.0045 N?

• 2

• 4

• 5

• ambiguous

How many sigs are in 3 x 10^5 m?

• 5

• 1

• 3

• ambiguous

Convert 18.3mm to cm.

• 183 cm

• 1.83 cm

• 0.183 cm

Convert 120.km/hr to m/s.

• 33.3 m/s

• 33 m/s

• 432.m/s

• 430m/s

Convert 0.045 kg to grams.

• 45.g

• 45.0g

• 4.5g

The equation for % error is the absolute value of:

• (theoretical - experimental) / (theoretical) x 100

• (theoretical - experimental) / (experimental) x 100

• (theoretical) / (theoretical - experimental) x 100

Precision means having all your answers grouped, whether they are in the correct area or not.

• True

• False

Calculate the % error of the following measurements, given a theoretical expected value of 75.0kg. Measurements: 89.1, 88.7, 89.4kg

• 18.8%

• 15.8%

• -18.8%

• -15.8%

Calculate the hypotenuse length if given the diagram. Ignore sigs.

• 24

• 6

• 10.4

• 13.8

Find the angle indicated, given the diagram. Round to the nearest degree.

• 30 deg

• 60 deg

• 55 deg

• 35 deg