write my assignment 4479

Using the rules of significant figures, calculate the following: 

2.7721

2.8

2.77

3

2.772

Convert 1903.8 g to mg.

1.9038×103 mg

19.038 mg

190.38 mg

1.9038×106 mg

1.9038 mg

What is the mass of lead in a bar that measures 3.0 cm by 5.0 cm by 20.0 cm? (The density of lead is 11.3 g/cm3 at 20°C.)

3400. g

26.5 g

3390 g

3.4×103 g

300 g

The pressure of the earth’s atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg)

5.02×104 kg/m2

2.09×10-2 g/m2

4.30×10-3 kg/m2

1.03×104 kg/m2

2.62×102 kg/m2