PHYSC

A rock is thrown vertically into the air. At the top of its path, its acceleration is

0

Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?

0kg-m/s

Exert 1 N for a distance of 1 m in 1 s and you deliver a power of

1 Work

A baseball player bats a force with 1000N. The ball exerts a reaction force against the bat of

1000N (action and reaction forces are the same)

Starting from rest, the distance a freely falling object will fall in 10 seconds is about

100m = (10 seconds) x (10N)

Ten seconds after starting from rest, a freely falling object will have a speed of about

100m/s= (10seconds)x(10N)

The gain in speed each second for a freely falling object is about

10m/s (10N gravity)

A 1-kg chunk of putty moving at 1m/s collides and sticks to a bowling ball initally at rest. The bowling ball and putty then move with a momentum of?

1kg/m/s

The mass of a pet turtle that weighs 10N is

1kg= (10g)/(10N)

Compared to your weight on Earth, your weight on Jupiter would be about

2 times (24.79)

A 5kg fish swimming at a speed of 1 m/s swallows a 1kg fish swimming at 4m/s The speed of the larger fish now is

2/3m/s

A car has a mass of 1000 kg and accelerates at 2 meters per second squared. What is the magnitude of the net force exerted on the car?

2000N = (1000kg)x(2m/s/s)

The average speed of a horse that gallops 10 kilometers in 30 minutes is

20km/h = (10km)x(30minsx2)

A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?

220=(22m/s)/(.1s)

On the surface of Jupiter, the acceleration due to gravity is about 3 times that of Earth. What would be the mass of a 100-kg rock on Jupiter?

3000N=(3x10g)x(100kg)

A 300kg bear grasping a vertical tree slides down at a constant velocity. The friction force between the tree and the bear is

30N= (300kg)/(10N)

a 4kg ball has a momentum of 12kg-m/s whats the balls speed?

3m/s= (12kg-m/s)/(4kg)

The age of the sun is about

5 Billion yrs

a 5 kg fish swimming at a speed of 1m/s swallows an absent minded fish at rest. The speed of the larger fish after lunch is

5/6 m/s

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

500N

The weight of a .6kg salami is about

6.0 N= (.6)x(10grav)

It takes 6s for a stone to fall to the bottom of a mineshaft. How deep is the shaft?

60m= (10N)x(6s)

A 10N falling object encounters 4N of air resistance. The magnitude of the net force on the object is

6N= 10N-4N

Earth pulls on the moon. Similarly the moon pulls on Earth, evidence that

Earth and the moon are simply pulling on each other because of action-reaction pairs

The scientist to first introduce the concept of inertia was

Galileo

newton discovered

Gravity is universal

If the sun were twice as massive

It's pull on Earth would double and the pull of Earth on the Sun would double

When the alignment of the Sun, the Moon, and Earth produce a solar eclipse, the body between the other two is the

Moon

Impulse-momentum relationship is a direct result of

Newton's second law

The predominant gas in the atmosphere of Earth is

Nitrogen (76%)

It is correct to say that impulse is equal to

a corresponding change in momentum

Action and reaction forces comprise the parts of

a single interaction

In science, a theory is

a synthesis of a large body of well-tested knowledge

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is

about 10 times

Disregarding air resistance, objects fall with constant

acceleration

While a car travels around a circular track at a constant speed, its

acceleration is zero

An object maintains its state of motion because it has

acceleration, mass, weight, and speed

with respect to the stars, the moon

and the earth circle each other

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

arrow's push against the bow string

Which has zero acceleration? An object

at rest, moving at constant velocity, in mechanical equilibrium

No greenhouse effect occurs on Mercury because of no

atmosphere

Evidence of the solar wind on Earth is the

aurora borealis

the general direction of a comet's tail is

away from the sun

the solar wind blows in a direction

away from the sun

Earth's gravitational field extends

both inside and outside the Earth and throughout the entire universe

Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters?

both require the same work. (70)(2)= 140 (35)(4)= 140

A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the

cannon has more mass than the ball

The two measurements necessary for calculating average speed are

distance and time

An object is propelled along a straight line path by force. If the net force were doubled, it's acceleration would

double

the reason that the moon takes on a crescent shape each month has to do with the

earth's shadow

an object at rest may have

energy

Whereas Aristotle relied on logic in explaining nature, Galileo relied on

experiment

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

farthest from the earth

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight-line path

a moving object on which no forces are acting will continue with constant

impulse, momentum, acceleration

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

increase also

the parts of saturn's rings with the greatest rotational speed are the

inner parts

with each pass of a comet about the sun, its mass

is appreciably reduced

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

its weight

Compared to a recoiling rifle, the bullet that is fired has a greater

kinetic energy

compared to the density water, the density of saturn is

less

a bow is drawn so that is has 40 J of potential energy. When fired, the arrow will ideallly have a kinetic energy of

less than 40J

Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because the

longer time to stop

A force is a vector quantity because it has both

magnitude and direction

A kilogram is a measure of an objects

mass

Compared with a 1kg block of solid iron, a 2kg solid block of iron has twice as much

mass, volume, and inertia

Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher

momentum

Which is most responsible for the ocean tides?

moon

An object that has kinetic energy must be

moving

the predominant gas in thhe atmosphere of venus is

nitrogen

The Sun tends to bloat outward by nuclear fusion, and contract due to

nuclear fission

Totality during a solar eclipse is not totally dark because

of light from the solar corona

A 10N block and 1 N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

one-tenth as much force on the heavier block

a satelite in an eliptical orbit travels at constant

speed, velocity, acceleration

Comets orbit about the

sun

No work is done by gravity on a bowling ball that rolls along a bowling alley because

the force on the ball is at right angles to the ball's motion

Your weight is

the gravitational attraction between you and the earth, a property of mechanical equilibrium, actually your mass

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that

the milk carton has inertia

The fastest moving planet in a solar system is

the planet nearest the sun

A ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is

the same

Compared with the same mass of a certain object on earth, the mass of the same object on the moon is

the same

A 10kg brick and a 1kg brick are dropped in a vaccum. The force of gravity on the 10kg brick is

the same as the force on the 1kg brick

The speed of planets about the sun depend on

their distances from the sun

In order to catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion .. Doing this reduces the force of impact on the player's hand principally because the

time of impact is increased

An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high, it gains

twice as much potential energt

If you push an object twice as far while applying the same force, you do

twice as much work

Tidal forces in general are the result of

unequal forces acting on different parts of a body

the planet that is most tipped to its orbital plane is

uranus spins at 98 degrees (on its side)

As an object free falls its

velocity and acceleration increases

The planet with a mass most like earths is

venus

If the speed of an object doubles, what else doubles?

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