Wei Wei Sun PHSC 101 Final part 2

How much buoyant force acts on a 10-ton ship floating in a fresh-water lake?

10 tons

Buoyant force is greates on a submerged

10-N block of aluminum

A stone is thrown horizontally at a speed of 20m/s from the top of a cliff. One second after leaving your hand its vertical velocity is

10m/s

With no air resistance, a projectile fired at 50 degrees has the same range as if it were fired at

40 degrees

A ball is thrown horizontally from the top of a tall cliff. One second later, the ball has fallen a vertical distance of

5 m

An object is placed exactly halfway between the Earth and moon. The object will fall toward the

Earth

If your mass doubles, your weight

also doubles

A totally submerged object displaces equal volume of liquid as its own volume

archemides' volume rule

Buoyancy in fluids equals to the weight of the displaced fluids ( both gases and liquids)

archemides's principle

A bullet fired from a rifle begins to fall

as soon as it leaves the barrel

As a helium-filled balloon rises in the air, it becomes

bigger

Which has the greater density, a lake full of water or a cupful of lake water?

both have the same density

Pascal's principle applies to

both of these

An object in a vacuum has no

buoyant force

If the part of an iceberg that extends above the water were suddenly removed, the

buoyant force on the iceberg would soon decrease

Acceleration is greater for a satellite in elliptical orbit when it is

closest to the Earth

Compared with an alcohol barometer, the column height for a water barometer would be

higher

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

higher in the salt water

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

increases

the intensity of gravitational force decreases with distance by

inverse square law

If the Sun were twice as massive

its pull on the earth would double and the earth's pull on the sun would double (both of these)

Escape speed from the sun is

larger than 11.2 km/s

every mass attracts every other masses in the universe

law of universal gravitational force

A block of styrofoam floats on water while a same size lead block lies submerged in the water. The buoyant force is greatest on the

lead

For the astronauts inside an orbiting space vehicle the force of gravity that acts on them is

mainly due to the earth below

The air in your cousin's room has

mass, energy, and weight (all of the above)

A satellite in an elliptical orbit travels at constant

none of the above (acceleration, speed, velocity)

Consider two planets in space that gravitationally attract each other. If the masses of both planets are decreased to half, and the distance between them doesn't change, then the force between them is

one-quarter

the basic principle for hydraulic machines

pascal's principle

every floating object displaces equal weight of liquid as its own weight

principle of floatation

Which has the greater density, pure water or cooking oil?

pure water

Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with

same on each if the volumes remain the same

You can experience weight

standing on earth's surface, in an accelerating elevator away from earth, in a rotating habitat in space (all of the above)

When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to

the bottom of the tower

A hunter aims a rifle at an angle of 10 degrees below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from teh side of the rifle. The bullet to hit the ground first is

the fired one

Planets wobble in their orbits due to

the gravitational attraction to other planets

Compared to the buoyant force on you when floating in fresh water, buoyant force on you when floating in the dense water of the Dead Sea is

the same

Compared to the speed a satellite loses when traveling from nearest to farthest points from Earth, the speed gained when returning from farthest to nearest is

the same

Compared with the buoyant force of the atmosphere on a helium-filled balloon, the buoyant force of the atmosphere on a nearby wood block of the same volume is

the same

After a stone that is thrown straight up reaches the top of its path and then falls downward, its acceleration is

the same as at the top of its path

If a pressure of 20 kPa is applied to one piston in a simple hydraulic device, the pressure on a piston of a larger area will be

the same, 20kPa

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?

the vertical component

The volume of water displaced by a floating 20-ton boat is

the volume of 20 tons of water

The buoyant force that acts on a submerged object is equal to

the weight of water it displaces

Consider two vertical tubes of equal cross-section area, one containing water and the other alchole. If the liquid pressures at the bottom of the tubes are equal, both liquids would have equal

weights

How far away from Earth must one travel to completely be beyond Earth's gravity?

you can't travel far enough

Your weight is defined to be the force

you exert against a supporting surface

A rock suspended by a weighing scale weighs 3 N when submerged in water and 5 N out of water. What is the buoyant force on the rock?

2 N

It would be easier to pull the evacuated Magdeburg hemispheres apart if they were

2 km above the ocean surface

A projectile is launched straight upward at 30m/s. Neglecting air resistance its speed upon returning to its starting point is

30m/s

If we double the mass of an object without a change in volume, its density would be

double

While you are standing, your blood pressure is normally greatest in your

feet

The concept of pressure involves both

force and area

An Earth satellite is simply a projectile

freely falling around the earth

Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it at the maximum height is

gravity force downward

According to Newton, the greater the masses of interacting objects, the

greater the gravitational force between them