3NA Physics - Density

3NA Physics - Density

Multiple Choice

Which box has a higher density?  

• Box A
• Box B
• cannot be determined
• they are the same

Multiple Choice

What is the formula for density?

• density = mass x volume
• density = mass / volume
• density = mass + volume
• density = mass - volume

Multiple Choice

Put the liquids in order from most dense to least dense?

• 4, 3, 2, 1

• 1, 2, 3, 4

• 3, 4, 2, 1,

• 4, 3, 1, 2

Multiple Choice

Helium balloons rise on earth because

• helium is less dense than air
• helium is more dense than air
• helium is cooler than air
• helium is warmer than air

Multiple Choice

Why do some substances sink in water?

• they are warmer than water

• they are cooler than water

• they are more dense than water

• they are less dense than water

Multiple Choice

Jack has a rock. The rock has a mass of 14 g and a volume of 2 cm³. What is the density of the rock?

• 7 mL

• 7 g/cm³

• 28 g/cm³

• 1/7 g/cm³

Multiple Choice

What is the volume of 150 grams of lead if it has a density of 11.3 g/cm³?

• 13.3 g

• 13.3 cm³

• 0.075 g

• 1695 cm³

Multiple Choice

A metal drum has a mass of 200 kg. When the drum is filled with 1.0 m³ of alcohol, the total mass is 1000 kg. What is the density of the alcohol? [Hint: Find the mass of alcohol first.]

• 0.0050 kg/m³

• 0.11 kg/m³

• 800 kg/m³

• 1000 kg/m³

Mass, Weight and Density

Assignment 2 Hints

Q1

• (a) refer to your notes

• (b)(i) Use density = mass / volume

• (b)(ii) If object is LESS dense than water (1000 kg/m³), it floats. OR If object is MORE dense than water (1000 kg/m³), it sinks.

Q2

• (a) Hint: Answer starts with letter 'W' or 'G'

• (b) Hint: Answer starts with letter 'G'

Q3

• (a)(i) Use Volume of 8 spheres = final volume - initial volume

• (a)(ii) Use Mass of 8 spheres = final mass - initial mass

• (b) Hint: Density of substance is the same, whether 1 sphere or 8 spheres.

Q4

• (a) Find the mass of steel pins first, then use density = mass / volume

• (b) density of cork stopper stuck with pins = total mass / total volume

• (c) less dense - float; more dense - sink

Q5

• (a) Hint: Ice is in solid state. Which volume(11 cm³ or 10 cm³) do you use? Work out the question to see if you can get the answer o 0.909 g/cm³?

Q5

• (b) 1.    From -10°C to 0°C: There is no change in density as the volume remains constant.

   2.    At 0°C: Volume of ice decreases to 10 cm³, causing the density to increase from 0.909 g/cm³ to 1.00 g/cm³.

   3.    From 0°C to 4°C: Volume of water continues to decrease, causing the density of water to increase further.

   4.    From 4°C: Volume of water then increases, causing the density of water to decrease.

  
  

• If you do not understand, please clarify your doubts with me.