Density, pressure & moments

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

Which box has a higher density?

• A

• B

• They are the same

Multiple Choice

What causes an object to sink in a water?

• if the object's density is less than the water's density.

• if the object's density is the same as water's density.

• if the object's density is greater than water's density.

• if the object's density is zero

Multiple Choice

Look at this image.  Which object has the LOWEST density in water? How? 

• The Ping Pong Ball because it floats to the top 
• The bolt because it has sunk to the bottom
• The soda cap because it is not just full of air like the Ping Pong ball

Multiple Choice

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

• 7 mL
• 7 g/cm³
• 28 g/cm³
• 1/7 g/cm³

Multiple Choice

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³
• 2 g/cm³
• 1/2 g/cm³
• 24 g/cm³

Multiple Choice

What is the formula for density?

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

Multiple Choice

Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm³. What is the density of the pen?

• 4 g/cm³
• 16 g/cm³
• .25 g/cm³
• 64 g/cm³

Multiple Choice

Find the volume of this piece of brass.  

• 50 g
• 10 cm
• 6 cm³
• 12 cm³

Multiple Choice

What is the volume of Object X?

• 10.0 cm³
• 15.0 cm³
• 20.0 cm³
• 25.0 cm³

Multiple Choice

An empty beaker has a mass of 60 grams.  When mercury is added to the beaker, it has a mass of 200 grams. What is the mass of the mercury?

• 140 grams
• 200 grams
• 140 mL
• 260 g

Multiple Choice

What is the volume of the fish?

• 18.0 cm³
• 6.0 cm³ 
• 38.0 cm³

Multiple Choice

What pressure does a 4000N horse exert on the ground if each foot is 10cm²?

• 40 N/cm²
• 100 N/cm²
• 400 N/cm²
• 10 N/cm²

Multiple Choice

When you increase your depth under water, the water pressure on your body

• increases

• decreases

• stays the same

Multiple Choice

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

• The pressure will increase

• The pressure will decrease

• The pressure will remain constant

• The pressure will equalize

Multiple Choice

The pressure inside the syringe will decrease if we move the plunger in:

• Direction A

• Direction B

• We don't have to move the plunger as the pressure will change on its own.

• None of the above answers.

Multiple Select

As you go up to high altitudes, the Gas pressure decreases because _________

• The air in the high altitudes are is not compressed

• Because the amount of gas particles are decreasing

• Because the gas particles in high altitudes are less dense

• Because the gas particles are far away to the gravity

Multiple Select

In this Image the bottle was shrank because _________

• It has been heated

• It was cooled

• Less Gas Pressure

• The Gas particles had less energy

Multiple Choice

The pressure exerted by a liquid

• increases with depth.

• decreases with depth.

• is constant

• first increases and then decreases.

Multiple Choice

A moment is...

• a force measured in Newtons

• a turning force measured in newton metres

• a distance measured in metres

• a time intervals measured in clicks

Multiple Choice

What to we call forces applied to anything that turns?

• Minute

• Moment

• Minimum

• Monument

Multiple Choice

What is the moment produced by the 15 N?

• 15 Nm (clockwise)
• 150 Nm (anti - clockwise)
• 1.5 Nm (anti - clockwise)
• 0.15 Nm (clockwise)

Multiple Choice

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door

Multiple Choice

Assuming the system is in equilibrium, calculate the missing distance d

• 3.4 m

• 2.8 m

• 4.4 m

• 1.6 m

Multiple Choice

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.

Which pivot positions allows the force F to be as small as possible?

• A

• B

• C

• D

Multiple Choice

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N

Multiple Choice

What is the size of the moment shown by the black arrow?

• 30 Nm

• 36 Nm

• 40 Nm

• 60 Nm