Physical Science Test 2

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The length of a certain wire is kept same while its radius is doubled. What is the change in the resistance of this wire?

(1/4) reduced by a factor of 4

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 s later?

100 m

A projectile is launched vertically at 100 m/s. If air resistance can be neglected, at what speed does it return to its initial level?

100 m/s

A pair of 6-W and 100-W incandescent lamps are intended for 120-V operation. Which lamp draws more current?

100-W lamp

A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated in the line is

12,800 W

A certain bulb with a resistance of 95 ohms and labeled "150 W" is designated for use in a

120-V circuit

a nutritionist in the United States measures the food energy in units of

Calories

The length of a certain wire is doubled while its radius is kept constant. What is the change in the resistance of this wire?

it is doubled

the greatest expansion of water occurs when

it turns to ice

to say that an object is electrically polarized is to say

it's charges have been rearranged

if the sun were twice as massive

its pull on the Earth would double and earth's pull on the Sun would double

when we talk about electric power we're talking

joules per second and watts

Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that accelerated downward?

less compressed

heat is thermal energy that flows due to

temperature differences

The fact that a thermometer "takes its own temperature" illustrates

thermal equilibrium

the fact that a thermometer 'takes its own temperature' illustrates

thermal equillibrium

Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The voltage is greater across the lamp with the

thin filament

The motion of particles that contribute to temperature are

translational

the motion of molecules that most affects temperature is

translational motion

An Earth satellite is simply a projectile freely falling around Earth

true

At absolute zero, a substance has no more energy to give up.

true

The lowest temperature possible in nature is -273°C.

true

To say that something is twice as hot as another suggests the hotter thing has twice the thermal energy.

true

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

twice

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

compared to the mass of a proton, the mass of an electron is

very much less

inside a freely falling elevator your

weight is zero

inside a freely-falling elevator your

weight is zero

If the Earth had twice its present radius and twice its present mass, what would happen to your weight?

weight would be half

strictly speaking, when you step off a curb you are momentarily

weightless

A metal ring with a gap in it is shaped like the letter C. When heated, the gap becomes

wider

The electric resistance of a superconductor is

zero

(

)

the lowest temperature possible in nature is

-273 C

the current in a 100-W bulb connected to a 120-V source is

.83 A

the temperature of melting ice is

0 C and 32 F

absolute zero corresponds to a temperature of

0 K and -273 C

A charge of 12. C passes through an electroplating apparatus in 2.0 min. What is the average current?

0.1 A

how much current is in a 60-W light bulb connected to 120 V?

0.5 A

A bullet fired horizontally hits the ground in 0.5 s. If it had been fired with twice the velocity it would have hit the ground in

0.5 sec

if a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is

1 sec

the temperature of boiling water is

100 C and 212 F

a woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weight there.

100 N

Find the ratio of the gravitational force between two planets if the masses of both planets are quadrupled but the distance between them stays the same.

16

two charges separated by 1 m exert a 1.0N force on each other. if the charges are pushed to .25-m separation, the force on each charge will be

16 N

What potential difference is required to cause 2.0 A to flow through a resistance of 8.0 Ω?

16 V

If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the total time to return to its starting position is

2 sec

When a battery does 24 J of work on 10 C of charge, the voltage it supplies is

2.4 V

the electric power of a lamp that carries 2 A at 120 V is

240 W

A length of wire has resistance R. The same wire twice as long has resistance

2R

The electric force on a 2 -C charge is 60 N. How great is the electric field at the charge location?

30 n/c

What would be the temperature of 50 g of 20°C water mixed with 80 g of 40°C water?

32.3 C

Consider a pair of planets for which the distance between them is decreased by a factor of 6. How many times does the force between them increase?

36

the power dissipated in a 4-ohm resistor carrying 3 A is

36 W

If the masses of two planets triples and the distance between reduces by half, the force between them would be

36 times as much

Two charges separated by 1 m exert a 1.0-N force on each other. if the magnitude of each charge is doubled, the force on each charge will be

4 N

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

45 m

A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

5 m

increasing the temperature of 50 grams of water by 1 C requires

50 calories

A projectile is launched straight upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

50 m/s

what is the force of gravity on a 500-N woman standing on Earth's surface?

500N

A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

5m

a pair of 60-W and 100-W incandescent lamps are intended fro 120-V operation. which lamp has a greater resistance?

60 W lamp

A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same down range distance?

75 degrees

The temperature of water rises when 2.00 calories are added. It will rise the same when

8.38 J are added

What is the magnitude of the gravitational force between Earth and a 1-kg body at its surface?

9.8 N

what is the power rating of a device that draws 0.8 A when connected to 120 V?

96 W

Where do you weigh more: at sea level or on top of one of the peaks of the Rocky Mountains?

at sea level

in the vacuum of outer space, there is no

atmospheric pressure

if the Earth had twice its present radius and twice its present mass, what would happen to your weight?

be half

as entropy in a system increases, energy within the system

becomes less ordered

a very massive object A and a less massive object B move toward each other under the influence of gravity. which force, if either, is greater?

both forces are the same

A hunter fires a bullet from a horizontally-held rifle while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

both hit at the same time

heat energy is measured in units of

both joules and calories

To say that electric charge is conserved is to say that electric charge

can neither be created nor destroyed

the electric force between charges is strongest when the charges are

close together

The specific heat capacity of aluminum is more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the wire to heat up quickest will be

copper

When the distance between two stars doubles, the force between them

decreaes by one-quarter

A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity

decrease

if Earth's mass decreased to one-half its original mass with no change in radius, your weight would

decrease to one-half

if your mass remained the same while the mass of Earth doubled while staying the smae size, your weight would

double

an object is placed exactly halfway between the Earth and the Moon. the object will fall toward the

earth

every proton in the universe is surrounded by its own

electric field and gravitational field

a positive ion has a deficiency of

electrons

consider two planets in space that gravitationally attract each other. if the masses of both planets are double, and the distance between them doesn't change, then the force between them is

four times as much

when you touch a hot penny in sunlight with your finger, energy flows

from the penny to your finger

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

from your finger to the ice

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

from your finger to the ice

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

greater the gravitational force

A baseball is tossed at a steep angle into the air and makes a smooth parabolic path. Its time in the air is t, and it reaches a maximum height h. Assume that air resistance is negligible. find the height reached by the ball (in terms of t)

h=(gt^2)/8

if the radius of the Earth somehow decreased with no change in mass, your weight would

increase

if the mass of Earth somehow increased with no change in radius, your weight would

increase also

If you heat a copper wire its electric resistance

increases

two object move toward each other due to gravity. as the objects get closer and closer, the force between them

increases

two objects move toward each other due to gravity. as the objects get closer and closer, the acceleration of each

increases

when the distance between two stars decreases by half, the force between them

increases four times as much

whether one object is warmer than another has most to do with

molecular kinetic energy

Whether one object is warmer than another object has most to do with

molecular kintetic energy

Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that accelerated upward?

more compressed

Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will draw

more current

at some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same. this point is

nearer the moon

The amount of gravitational force that acts on a space vehicle that orbits Earth is

nearly as much as the vehicle's weight on Earth's surface

As you comb your hair, electrons are rubbed onto the comb, which becomes

negatively charged

A projectile is fired horizontally. With no air resistance it maintains its horizontal component of velocity because

no horizontal forces act on it

at absolute zero, a substance has

no more energy to give up

if the masses of two planets doubles and the distance between them also doubles, the force between them would be

none of the above

which is the smallest unit of measurement for temperature

one Farenheit degree

Electric field lines about a point charge extend

outward when the charge is positive

If you strip electrons from an atom, the atom becomes a

positive ion

the nucleus of an atom is charged

positively

when you remove electrons from a metal cup, the cup becomes

positivley charged

When the distance between two charges is halved, the electric force between the charges

quadruples

when the distance between two charges is halved, the electric force between the charges

quadruples

roll a bowling ball off the edge of a table. as it falls, its horizontal component of motion

remains constant

A pair of positively-charged plastic straws tend to

repel each other

one main difference between gravitational and electric forces in that electric forces

repel or attract


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