Edited Invalid date

0

0

Quiz

11.7 Archimedes' Principle

- Your arms feel heavy when you rise from the bath.
- You no longer have the support of the water.

- The upward force on the bottom of an object in a fluid is greater than the downward force on the top of the object.
- The object will rise to the surface if the force is greater than the object's weight.
- The object will sink if the force on the object is less than the object's weight.
- The object will remain suspended if the force is equal to the object's weight.
- The force is always present when the object floats, sinks, or is suspended in a fluid.

- The net upward force on any object is called the buoyant force.

- With depth comes increased pressure due to the weight of the fluid.
- The upward force on the bottom of the cylinder is greater than the downward force on the top of the cylinder.
- Their force is different.

- The object will rise if the weight is greater than the object.
- The object will sink if it is less than its weight.

- The weight of the fluid displaced must be equal to the weight of the surrounding fluid.
- That is a statement of the principle.

- fluid has a weight and fills the space it occupied.
- The weight of the fluid displaced by the object is supported by the surrounding fluid.

- Any object in any fluid, whether partially or completely submerged, is valid.

- The weight of the fluid is equal to the weight of the object.

- In preparation for the Beijing Olympics, high-tech body suits were introduced.
- The suits should not give any advantage.

- The density of water is less than that of aluminum foil.
- Take a piece of foil and roll it up into a ball.

- You can mold the lump of clay into a boat.
- The shape of the boat makes it displace more water than the lump.
- Steel ships are the same.

- The weight of water must be displaced to find the force.
- The densities of water and steel are given in Table 11.1.
- The steel's volume and the water's volume are the same.
- We can find its mass and weight by knowing the volume of the water.

- First, we use the definition of density to find the steel's volume, and then we substitute values for mass and density.

- This is the volume of water displaced because the steel is completely submerged.
- The mass of water is displaced from the relationship between its volume and density.

- The steel's weight is much greater than the force of the water.

- The density of steel is only two digits so the force is rounded to two digits.

- The maximum volume of water the steel boat can displace is given here.
- The volume of water is the weight of the force.

- The mass of water displaced is found from the relationship between density and volume.

- The ship can carry a load nine times its own weight without sinking if it has a maximum buoyant force of ten times the steel's weight.

- A piece of foil is very thin.
- A piece of foil is 10 cm by 15 cm.
- Take a test of your prediction.

- Density is a crucial part of the principle.
- The density of an object is what determines whether it floats.
- It will float if its average density is less than the surrounding fluid.
- The fluid with a higher density contains more mass and weight in the same volume.
- The weight of the object is less than the weight of the fluid displaced.
- The object will sink if it's denser than the fluid.

- The extent to which a floating object is submerged depends on the density of the fluid.
- The unloaded ship has a lower density and less of it is submerged than the loaded ship.
- Density can be used to derive a quantitative expression for the fraction submerged.

- The volume submerged is the volume of fluid displaced.
- The relationship between densities can be obtained by substituting into the expression.

- An unloaded ship floats higher in the water than a loaded ship.

- The last relationship is used to measure densities.
- A hydrometer is used to measure the fraction of a floating object that is submerged.

- The density of the object or substance is the same as the density of water.
- Specific gravity is not related to whatever units are used for.
- The object's gravity is less than one if it floats.
- Its specific gravity is greater if it sinks.
- The specific gravity of the floating object is equal to the fraction that is submerged.
- If an object's specific gravity is 1, then it will not sink or float.
- Scuba divers try to get this state so that they can swim.
- The specific gravity of fluids is an indicator of their condition.

- The density of an object to a fluid is called specific gravity.

- The hydrometer is floating in water.
- The glass hydrometer is weighted with lead at the bottom.
- It floats highest in the densest fluids and has been labeled so that specific gravity can be read from it.

- When a woman's lungs are full of air, she should be submerged in freshwater with her volume submerged.

- We can calculate the woman's density by knowing both the fraction submerged and the density of water.

- Her density is not as high as the fluid density.
- Body density is an indicator of a person's percent body fat.

- He is weighed in a "fat tank" where he is submerged as part of a body density determination.
- The subject needs to empty his lungs and hold a metal weight in order to sink.
- The metal weight and residual air in his lungs are measured separately.
- His corrected submerged weight, his weight in air, and pinch tests of strategic fat areas are used to calculate his percent body fat.

- Less obvious examples include lava rising in a volcano and floating on the mantle beneath the mountain ranges.
- Earth has fluid characteristics.

- The density of the coin is calculated using these two measurements.

- A coin is weighed in air and then submerged in a liquid.
- If the fluid density is known, the density of the coin can be calculated.
- If the density of the coin is known, this technique can be used to determine the density of the fluid.
- All of the calculations are based on the same principle.

- The weight of the fluid displaced is equal to the weight of the object.
- We call this measurement the object's apparent weight because it means that the object appears to weigh less when submerged.
- The weight of the fluid displaced is equal to the weight of the object.
- On balances that measure mass, the object suffers an apparent mass loss equal to the mass of fluid displaced.

- This technique is used in the next example.

- When the coin is submerged in water, the mass is 7.800 g.

- We need the coin's mass and volume to calculate its density.
- The coin's volume is the volume of water displaced.
- The equation for density can be used to find the volume of water displaced.

- The mass of water displaced is the volume of water.
- The apparent mass loss is the mass of the water displaced.
- The volume of water is.
- This is the amount of the coin that is submerged.

Assignment Panel

View flashcards and assignments made for the note

Getting your flashcards

Review

Quizzes

Mine

Others

Notifications

U

Profile

Mobile App

Privacy & Terms

Feedback

Need Help?

Tutorial

Log out