Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is

• the same

• greater

• less

A solid glass ball weighs 1 N. One with twice the diameter weighs

• 3 N

• 1 N

• more than 4 N

• 2 N

The metal in a chunk of copper or iron is composed of

• amorphous particles

• non-crystalline fibers

• crystals

• none of the above

A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of

• 5 g/cm³

• 2.5 g/cm³

• 10 g/cm³

• 1 g/cm³

Which ball will bounce higher off a hard surface?

• a common rubber ball

• a steel ball

• both the same

If a pencil's length and diameter are both multiplied by 10, then its volume is multiplied by

• 1000

• 100

• 10,000

• 10

Stone slabs are stronger under

• tension

• compression

• both of these

• neither of these

The effects of scaling are beneficial to small creatures

• who are hungry

• that get wet

• that fall from great heights

Doubling the thickness (diameter) of a rope will multiply its strength by

• 3

• 1

• 2

• 4

The strength of a rope depends on its

• length

• thickness

• both of these