PY 131 Chapter 12 and 13 Conceptual Academy Quizzes

Sneezlee claims that citing the mass and volume of a piece of quartz mineral containing gold will enable him to calculate the

amount of gold it contains.

In this lesson, if you wish to calculate the mass of something, the best way to begin your solution is to

Write m=

Compared to other lessons, this one uses more

algebra

Presssure is

directly proportional to the force.

Pascal vases in this lesson were used to illustrate

pressure being depth dependent.

Water is stored in elevated towers to provide

reliable pressure to users of water connected to the tower.

Liquid pressure depends on

both depth and density of liquid.

The force that water exerts on a surface depends on the

both pressure and area of the surface.

More pressure is on the bottom of a submerged object because the bottom is

deeper

A boulder sinks in water because

its weight is greater than the buoyant force on it.

Any body submerged in water is buoyed upward by

the weight of fluid displaced by the body.

The Falkirk Wheel

in Scotland illustrates Archimedes' principle.

A floating 100-ton ship displaces

100 tons of water.

A blob of water in water doesn't sink when its weight

equals its bouyant force.

A rock at the bottom of a pond weighs

the same as when on dry land.

Winnie experiences easier lifting of her barbell

while submerged in water.

After a piece of iron that floats in a pie pan is tossed overboard, the pie pan floats

higher in the water.

The buoyant force acting on the floating pie pan is equal to

either the weight of the pie pan or the weight of water displaced; they are the same.

Pascal's principle mainly involves

hydraulics.

Apply pressure to water in one end of a pipe and the pressure at the opposite end will be

the same

With the proper arrangements of pistons in a hydraulic device, one can multiply

force

Which of the following has the greatest density?

Gold

For which of these does density vary most?

Oxygen

The pressure increases on a block resting on a table when you increase the

downward force on the block.

Water pressure in a lake is greater

at the bottom.

A stone submerged in water displaces it

volume of water.

If an object suspended by a scale shows a weight of 3N in air, and 2 N when submerged in water, the buoyant force on the submerged object is

1 N

An object having the same density as water will

neither sink nor float in water.

The buoyant force on a floating object is

equal to the object's weight.

The operation of a hydraulic press best illustrates

conservation of energy.

Any object immersed wholly or in part experiences a bouyant force that is equal to

the weight of liquid displaced

A 1-liter block of lead and a 1-liter block of aluminum sit at the bottom of a swimming pool. Which has the greater buoyant force?

They each experience the same buoyant force.

A raft loaded with Styrofoam floats in a swimming pool. When the Styrofoam is thrown overboard, the pool level will

remain unchanged. (it floats)

What happens to the density of a block of steel when it expands when placed in a hot furnace?

**The density is less.**

If you compress a loaf of bread to a smaller size you'll make the

\n **density increase.**

What happens when you quickly remove the portion of an iceberg extending above the water?

The buoyant force on the iceberg decreases.

As a boat is loaded with Styrofoam, does it sink deeper or rise higher?

It sinks deeper in the water.

A 1-pound block of lead and a 1-pound block of aluminum sit at the bottom of a swimming pool. Which has the greater buoyant force?

\n **The 1 pound block of aluminum.**

Why is it so difficult to submerge a 6-N block of aluminum into a pool of liquid mercury?

Because the bouyant force is much more than 6 N.

A fresh egg sits at the bottom of a pot of water. Salt is sprinkled into the water until the egg rises to the surface, which tells us

the density of salt water exceeds the density of egg.

A 1-kg block of lead and a 1-kg block of aluminum sit at the bottom of a swimming pool. Which has the greater buoyant force?

\n **The 1-kg block of aluminum.**

Comparing the density of a pure gold ring and the density of a bar of pure gold, which is correct?

\n **They have the same density.**

A cube of wood floats in water while a cube of iron of the same size sits at the bottom of the water. Which has the greatest buoyant force?

The block of iron.

A chunk of gold is fixed to the center of a block of wood that then floats in a bucket of water filled to the brim. If the block is then turned upside down so that the gold is submerged, what happens to the water level in the bucket?

\n **The water level remains the same.**

When floating in fresh water, the buoyant force acting on you equals your weight. When floating in the high-density water of the Dead Sea, the buoyant force acting on you is

\n **still equal to your weight.**

Compare the densities of water in a lake and a cupful of water from the same lake. Which is correct?

Both have the same density.

A submarine fully submerged and maintaining a constant depth has a density about equal to that of

**water.**

A raft filled with marbles floats in a swimming pool. When all the marbles are thrown overboard, the pool level will

**fall.**

The buoyant force on an object is least when it is

partly submerged

A spring supporting a load stretches 10 centimeters. When the load doubles in weight, how much farther does the spring stretch?

\n **It will stretch another 10 cm, making the total stretch 20 cm.**

What determines pressure within a liquid?

\n **Both density and depth.**

How can a hydraulic press multiply a force by 100?

At the expense of the distance through which the force acts.

A sleeping lobster rests upon a bathroom scale placed at the bottom of the sea.When both are lifted out of the sea and onto a boat, the scale's reading is

\n **greater.**

A life jacket helps you float by

equalizing you and the water's density.

What is the density of a 1000-kilogram block that has a 2 meter-cubed volume?

\n **500 kg per cubic meter**

The volcanic rock pumice floats on water. What do you know about its density relative to water?

\n **Pumice is less dense than water.**

How does the density of a lobster compare with the density of seawater?

\n **Its density is greater than the density of sea water.**

A weight is tied to a balloon filled with air and then placed in a lake. Both will sink

\n **with a continuously decreasing buoyant force.**

How much water is displaced by a one-liter block of wood floating in water?

\n **Less than 1 liter.**

The buoyant force on a block of cement is least when submerged

\n **at any depth.**

What is the mass of one liter of water?

\n **1 kilogram.**

At the bottom of a swimming pool, what does water presssure NOT depend upon?

Surface area of the water.

For a hydraulic press, which is never lost from the input to output pistons

energy

What is true of two objects that have the same weight density?

They have equal mass densities.

Compared to the buoyant force that acts on you when you float in fresh water, the buoyant force that acts on you when you float in denser seawater is

the same.

A hole is to be drilled through the wall of a tall tower of water. Water spurts out the farthest distance when the hole is drilled at

the bottom of the tower.

What occurs to the density of an object when you double its mass while keeping the volume the same?

\n **The density doubles.**

Two life jackets are identical except one is filled with foam and the other filled with gravel. One floats and the other sinks. Which experiences the greater buoyant force?

\n **The sinking sand filled life preserver.**

According to a spring scale, a 5-N rock weighs only 3 N when submerged in water. What is the density of this rock?

2\.5 times the density of water.

Three identical swimming pools are filled to the brim. In pool A is an iceberg with air bubbles. In pool B is an iceberg containing unfrozen water. In pool C is an iceberg with steel ball bearings. What happens in each pool after its iceberg melts?

\n **The water level in C will decrease while the other two water levels will remain the same.**

How does the density of a fish compare to the density of the water in which it freely swims?

The density of the fish and the water is the same.

As an ice cube melts in a glass of water, what happens to the level of the water in the glass?

\n **The water level remains the same.**

A freely swimming fish displaces its own

both weight and volume of water.

An ice cube containing bubbles of air floats in a glass of water. What happens to the level of the water in the glass as the ice cube melts?

The water level remains the same.

Why is a dam thicker at its bottom?

Water pressure increases with depth.

A 90-ton floating ship displaces how much water by weight?

90 tons

Where in your body is your blood pressure the greatest?

Your feet.

Which occupies more volume, a kilogram of iron or a kilogram of feathers?

The feathers.

For an object fully submerged in a swimming pool, where is the water pressure greatest?

At the bottom of the submerged object.

For a submerged object, why does buoyant force always act upward?

Upward pressure against the bottom is greater than downward pressure against the top.

A stone held up by a thread weighs 6 N out of water and 2 N when submerged. The bouyant force on the stone is

**4 N**

Two equal size-pots are filled with water to the brim, but in one of the pots there is a floating block of wood. Which pot has the greater total weight?

Both pots have the same total weight.

(don’t ask me how this answer is correct)

A 5-gram block of metal has a volume of 2 cubic centimeters. What is the density of another block of the same material that has a volume of 4 cubic centimeters?

\n **2.5 g/cc.**

A raft holding a 50-gallon jug of water floats in a swimming pool. When the water in the jug is poured overboard, the pool level will

\n **remain unchanged.**

An ice cube containing bits of iron floats in a glass of water. What happens to the level of the water in the glass as the ice cube melts?

\n **The water level falls.**

A 30-ton floating boat displaces what volume of water?

\n **A volume water equal to 30 tons.**

What occurs to the density of an object when you double its volume while keeping the mass the same?

\n **The density becomes half.**

An 8-ton ship floats in the ocean. What is the buoyant force acting on this ship?

**8 tons**

For a hydraulic lift, the small input force is best applied to the smaller or larger diameter piston?

\n **The smaller diameter piston.**

When a boat sails from fresh water to salt water, the boat will float

\n **higher in the water.**

What does a fully submerged object displace?

\n **Its own volume of fluid.**

When a chocolate bar is cut in half, what happens to its density?

\n **The density is unchanged.**

A dike holding back the Atlantic Ocean springs a leak through a small hole near the top of the dike. A brave Dutch boy sticks his finger into the hole until help arrives. How likely is the scenario?

\n **The force on his finger would have been less than 1 N.**

Fully submerged are two life jackets, identical except that one is filled with Styrofoam and the other with sand. Which experiences the greater bouyant force?

\n **As long as their volumes are the same, the bouyant forces are the same.**

For a hydraulic press the input to output force ratio equals the input to output ratio of the piston's

**areas.**

A chunk of gold is fixed to the center of a block of wood that then floats in water with only one quarter of its volume above the surface. If the block is then turned upside down so that the gold is submerged, how much of the block will float above the surface?

\n **More than 1/4, so that it floats higher.**

What are the standard units of the "pascal"?

\n **Newton per square meter.**

A block of metal's density is 4000 kg per cubic meter. With a volume of 4 cubic meters, its mass is

\n **16000 kg**

A block of metal's density is 5000 kg per cubic meter. With a mass of 15,000 kg, what is its volume?

\n **3 cubic meters**

An iron cube sits in a toy boat floating in a bucket of water 10 centimeters deep. The cube is then removed from the boat. What is the depth of the bucket into the water?

\n **Less than 10 cm.**