WorksheetsHot Air Balloons
Total questions: 11
Worksheet time: 42mins
Why can an object float in a fluid?
The object is made of material that is less dense than the fluid it is immersed in.
The mass of the fluid the object displaces is greater than the mass of the object.
The object is made out of a material that repels the fluid.
The object is lighter than the fluid.
A boat weighting 100lbs loaded with a cargo of 1000lbs of lead is placed in a pool with 8000lbs of water. Will it float?
Yes
No
That depends on the volume of the boat.
That depends on what the boat is made of, styrofoam or steel.
The density of water is 1kg/L . A 2L plastic bottle weighing 0.4kg has 1.5kg of sand placed in it. Will it float?
Yes
No, steel does not float.
No, it weighs more than the density of water.
There is not enough information to answer this question.
A cement boat has a volume of 10.0kL and a mass of 100.0kg will it float?
Yes, because of its hollow form, it can displace 10.0kL which is heavier than the mass of the boat.
No, cement has a greater density than water
No, 10.0kL is not as heavy as the 100.0kg mass of the boat.
Yes, because cement repels water.
A stand up paddle board made out of Styrofoam, weighing 10.00 kg has a volume of 0.150cubic meters. Given the density of water as 1000.0kg per cubic meter, what mass of payload can the board hold before sinking?
150kg
.15kg
140.0kg
160kg
Zero, it won't float because styrofoam does not repel water.
A stand up paddle board made out of Styrofoam, weighs 10.00kg has a volume of 0.1500cubic meters. Given the density of water as 1000.0kg per cubic meter, what mass of payload can the board hold before sinking?
150.0kg
.150kg
140.0kg
160.0kg
Zero, it won't float because styrofoam does not repel water.
If the air inside the balloon and outside the balloon are of the same composition, why would it float?
The molecules of air inside the balloon are farther apart than outside the balloon because hotter molecules move faster.
Each molecule of air inside the balloon less dense those outside the balloon because hotter molecules move faster.
The mass of hot air inside the balloon is less dense than that cooler air outside the balloon.
The impact of the faster molecule inside the balloon on the cooler molecules outside repels those molecules and lifts the balloon.
The hot air is expelled forceably out the bottom of the balloon which, according to Newton's law of action/reaction, is pushed up into the air much like a rocket, in slow motion.
PV=nRT What is the density of the air molecules in moles/m3 at STP. R=0.082057 L*atm/mol*K T=273K P=1.00atm
0.0446 m/L
22.4 m/L
3326.9 m/L
Not enough information to calculate the value
What is the density of air in moles/Liter at P=1.00atm Room Temperature
T=21.0C=294K PV=nRT R=0.08257L*atm/mole*K
0.0415 moles/L
22.4 moles/Liter
24.1 moles/Liter
There is not enough information to answer this questions
0.0446 moles/Liter
Which of the payload masses below could be lifted by a balloon weighing 5.00g and a
Volume of 22.4L on a freezing morning with a
Temperature of 32F (0C the freezing point of water 273K)
if the air in the balloon can be heated to a
Temperature of 212F (100C the boiling point of water 373K)
when Pressure inside and out is 1.00atm
7.72 g
2.00g
It can't even lift its own weight!
12.7g
There is not enough information to determine this
Which Balloon Volumes below would be able to float 100 paper clips (weighting 100.0g) if the itself weighs 1.00kg? Given air pressure of 1.00atm and temperature of 0.00C (Water Freezing Point 32.0F) and dry air density of 28.97 g/mole at STP.
900 L
86L
1.00 cubic meters
22.4L
There is not enough information to calculate and answer
