Compound measures

Which of these is a correct formula?

• $Density=Mass\times Volume$

• $Mass=\frac{Volume}{Density}$

• $Volume=Mass\times Density$

• $Volume=\frac{Mass}{Density}$

Which of these is a correct formula?

• $pressure\ =force\times area$

• $area=force\times pressure$

• $force=\frac{pressure}{area}$

• $pressure=\frac{force}{area}$

Which of these is a correct formula? (more than one)

•  $speed\ =\ dis\tan ce\ \times\ time\$ 

•  $dis\tan ce\ =\ speed\ \times\ time$ 

•  $speed=\frac{dis\tan ce}{time}$ 

•  $time=\frac{speed}{dis\tan ce}$ 

A body with a mass of 50g has a volume of 2cm³. What is its density?

• 52

• 25 g

• 25 g/cm³

• 48 g/cm³

A pressure of 2.5 N/cm² is exerted over an area of 12 cm² . What is the correct answer and units?

• 30

• 30 N

• 30 cm²

• 30 N/cm2

Leona cycles 1.5 km in 6 minutes. What is her average speed (km/h)?

• 15 km/h

• 9 km/h

• 0.15 km/h

• 0.25

A body with a mass of 400 g has a volume of 8 cm³ . What is its density?

• 5 g/cm³

• 392 cm³

• 400

• 50 g/cm³

A force of 40 N acts over an area of 8 cm². What is the pressure?

• 48

• 5 N/cm²

• 50 N

• 5

How long does it take to travel 125 km at a speed of 50 km/h?

• 2.5

• 2 hours 30 mins

• 6250 mins

• 5 hours

A body has a density of 0.5 g/cm³ and a volume of 8 cm³ . What is its mass?

• 40 cm³

• 40 g

• 4 g

• 4 g/cm³