Modern electroplaters can cover a surface area of 55.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold?
A) 3.64 107 m
B) 1.46 109 m
C) 1.83 106 m
D) 2.93 108 m
Multiplying a 4 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures?
The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 40 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 2.0 105 m. Find the total surface area of these N spherical droplets.
A) 60,000 cm2
B) 24,000 cm2
C) 20,000 cm2
D) 2800 cm2
A circle has an area of 2.0 m2. A second circle has triple the radius of the first. The area of the second circle is _____ times that of the first.