physical science test 2

The lowest possible temperature is

-273 C

Absolute zero corresponds to a temperature of

0 K and -273 C

What is the weight of water displaced by a 100-ton floating ship?

100 tons

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?

2N

Increasing the temperature of 50 grams of water by 1°C requires

50 calories.

Phil stands at rest with both feet on a scale that reads 500 N. After he gently lifts one foot, the scale reads

500 N.

A dropped ball gains speed because

a gravitational force acts on it

If your mass doubles, your weight

also doubles

When boiling your breakfast eggs while in the mountains, to compensate for altitude you should

boil the eggs for a longer time.

Blow on your hand and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is

cool

If Earth's mass somehow decreased with no change in its radius, your weight would

decrease also

Water pressure at the bottom of a lake depends on the

depth of the lake.

When a gas in a container is squeezed to half its volume at constant temperature, the gas pressure

doubles.

When water boils, energy added to the water is counteracted by

energy carried away by steam

After taking a shower and stepping outside the shower stall, the chill you often feel is mainly due to

evaporation.

When most substances are heated, molecules inside move faster and occupy more space, which results in thermal

expansion

An Earth satellite in an elliptical orbit travels slowest when it is

farthest from the Earth.

Blood pressure is normally greater in your

feet

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

forget it; you can't travel far enough

When you touch a piece of ice with your finger, energy flows

from your finger to the ice.

A hydraulic device has two pistons, one with a small cross-section area and another piston with a larger cross-section area. If a given force is applied to the small piston, the output force on the larger-area piston will be

greater

Airplane lift is achieved when air pressure on the bottom of its wings is

greater than pressure on top.

Compared with the period of satellites in orbit close to Earth, the period of satellites in orbit far from Earth is

greater.

If the volume of an object doubles with no change in mass, its density would be

half

A piece of pizza is normally a net radiator of energy when its temperature is

higher than its surroundings.

The higher the temperature of an object, the

higher the frequency of emitted radiation

The temperature at which water freezes is the same as the temperature at which

ice melts.

When air is compressed, its temperature

increases

Because a refrigerator operates with some kind of motor, leaving the refrigerator door open in a closed room on a hot day

increases room temperature.

When the distance between a pair of stars decreases by half, the force between them

increases to four times as much

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

increases.

When you rapidly stir some raw eggs with an egg beater, their temperature

increases.

Which of the following normally warms up faster when heat is applied?

iron

A marshmallow in a vacuum becomes

larger

Hot sand cools off faster at night than plants and vegetation, which indicates that the specific heat capacity of sand is

less than for plants.

According to Newton, the greater the distance between gravitationally interacting objects, the

less the gravitational force between them

A lobster crawls onto a bathroom scale submerged on the ocean bottom. Compared to its weight above the surface, its apparent weight under water is

less.

A substance that heats up relatively quickly has a

low specific heat capacity

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

lower

When salt is introduced to ice, the temperature at which melting occurs is

lowered.

You experience weightlessness

momentarily when you step off a chair.i n a freely falling elevator. in the absence of a supporting surface.

The overflow of gasoline from a car's full metal tank on a hot day is evidence that gasoline expands

more than metal.

Which of these are good conductors?

none of the above (feathers,snow,wood)

What holds Earth satellites up so they don't crash into Earth?

nothing, they continually fall fast enough around Earth not to crash

When a shower is turned on, the shower curtain moves towards the water spray. This partly involves

pressure changes in moving fluids

When a gas is changed to a liquid phase, the gas

releases energy

Buoyant force is greatest on a submerged 1-cm3 block of

same on each

In practice, a good insulator

slows heat flow

It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

supports this.

The white-hot sparks from a fireworks sparkler that strike your skin don't cause injury because

the energy per molecule is high, but the total energy transferred is small

Evaporation is a cooling process because

the more energetic molecules escape the liquid

If the Sun were twice as massive,

the pull of the Earth on the sun would double and its pull on the Earth would double

Compared to a bar of pure gold, the density of a pure gold ring is

the same.

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

the weight of water it displaces.

Which law of thermodynamics states that no system can reach absolute zero?

third law

Part complete Without air resistance, a projectile fired horizontally at 8 km/s from a mountain top will

trace a curve that matches Earth's curvature. accelerate downward at g as it moves horizontally. return to its starting position and repeat its falling behavior.

Heat is thermal energy that matter

transfers.

Consider two planets in space that gravitationally attract each other. If the mass of one planet is doubled, and the distance between them doesn't change, then the force between them is

twice as much.

If the same quantity of heat is added to both a 1-liter and a 2-liter container of water, the temperature change of water in the 1-liter container will be

twice.

Which is not a phase of matter?

vacuum