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Taelor S.

which is the smallest particle of those listed below? molecule, neutron, proton, atom, quark

quark

Compared with the number of atoms in a typical breath of air, about how many breaths of air are in the Earth's atmosphere?

There are far more atoms in a breath of air than in the Earth's atmosphere

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Can all of the matter in the universe be listed in the periodic table?

no

The weight of the atom has to do with its _______________

protons

If we doubled the magnifying power of the most powerful optical telescope in the world we would...

be able to see individual atoms

If an object moves with constant acceleration is velocity must _______

change by the same amount each secon

If a 100 lb person steps on two scales. One is 60 the other must be _____

40

Swing a rock overhead in a horizontal circle, and the string breaks the rock will follow a __________ path

straight line

If you exert a horizontal force of 100N on a crate and it slides along a floor at a constant rate, then the friction between the create and the floor is ________

100 N or equal and opposite

If you have snow on your boots, you can get the snow off by stamping your boots on the floor. This is according to the law of ________

inertia

Speed is always measured in terms of a unit of distance and _________

time

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An object falls freely from rest on a planet where the acceleration due to gravity is twice as musich as it is on earth. 5 sec, d=

250m

Toss a ball upward at 10 m/s and the time it takes to reach its highest point is about ________

1 second

If a car increases its velocity from zero to 50 km/h in 5 seconds, the average acceleration is _____________

10 km/h/s

A horse gallops a distance of 10 km in a time of 30 mins the average speed is_____

20 km and hour

While a car travels around a circular track at a constant speed it is ____________

not accelerating

It takes 6 seconds for a stone to hit the bottom of a mine shaft. How deep is the shaft?

about 180 m

At one instant an object in free fall is moving downward at 50 m/s. One second later it should be about ______

60 m/s

An airplane flies at 120 km/h in still air. It flies into a 20 km/h headwind, its ground speed is

100 km/h

Toss a ball upward at 30 m/s and if air drag is negligible, the ball will be in the air for _____________

6 seconds

The net force on an equilibrium

zero

A ball is thrown upwards and returns to the same position. Compared to its initial speed what is the speed when it returns?

the same speed

What distinguishes velocity from speed?

direction

When a bat hits a ball, the ball simultaneously exerts __________ force on the bat

the same

If you toss a rock straight up in the air, at the top of its path the acceleration is _______

g

A fast moving massive car collides with a slow moving light car. The acceleration is greater on the ________

small car

A fast moving massive car collides with a light slow moving car. The force of impact is __________.

the same on each car

The attraction of a person's body toward the Earth is called weight. The reaction to this force is _______

the person's body pulling on the earth

A 10 kg block with an initial velocity of 10 m/s slides 10m along a horizontal surface and come sot eh rest. It takes the block 2 seconds to stop. The stopping force on the block is about ____________

50N

When a 25N falling object encounters 15N of air resistance, the net force on it is _______ and it accelerates _____________.

10 N and it accelerates downward at less than g

If the force remains the same while the mass of the cart decreases to half. The acceleration of the cart _________

doubles

As a falling object gains speed in falling, air drag _________`

increases

2000kg car experiences a breaking force of 10000N and skids to a stop in 6 seconds. The speed of the car just before the breaks was ______

30 m/s

according to the work energy theorem, in the absence of friction, if you do 100J work on a cart you'll increase its KE by ______

100 J

A flower pot of mass M falls from the rest to the ground below to a distance H. Which is correct?

Kinetic energy of the pot when it hits the ground is proportional to H

A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?

3 m/s

Which requires more work? Lifting a 25kg bag 10m vertically or a 50kg bag 5 m vertically?

the same

A 1 kg ball dropped from a height of 2m rebounds only after 1.5m after hitting the ground. The amount of energy converted to heat is about ______

5.-0 J

A refile of mass 2 kg is suspended by strings. The rifle fires a bullet of mass .01kg at a speed of 200 ms. The recoil velocity is about

1 m/s

Two identical arrows (one with twice the speed) are fired into a hay bale. The faster arrow will penetrate how many times faster?

4 times

A cannon with a long barrel fires a shell faster because the shell experiences a greater __________

impulse

Two identical gliders slide toward each other on an air track. One moves at 2 ms and the other at 1ms. If they stick together the combo is at _______

0.5 ms

If superman throws in space a boulder with 10 times as much mass as himself, the boulder leaves his hands at 100 km/h, how fast does superman recoil?

1000 km/h

Gravity accounts for

all of these

Why is your weight not one quarter as much as when you climb to the top of a twice as tal tree?

because you're not twice as far from the earth's center

to escape earth's gravitational field you could travel to?

two are correct

A lunar month is about 28 days, if the moon were farther from the Earth that is now, the lunar mnth would be _________

more than 28 days

Atop a cliff, a projectile is horizontally fired with an initial speed of 10 m/s. Neglecting air resistance what is the speed one second after it is fired

14 m/s

An object is dropped and freely falls to the ground with an acceleration of 1g. if it is thrown at an upward angle the acceleration is _________

1 g downward

Force of gravity does work on a satellite when it is in

eliptical orbit

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance is

5t^2 so 5 m

Inside a free falling elevator your __________

apparent weight is zero

When a star collapses to form a block hole its mass _________

is the same

If the earths radius somehow bloated to twice its size, with no change in mass, your weight as Earth's new surface would be __________

one quarter

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

3100 m

Joe can jump vertically 1 meter from his skateboard when it is at rest. When the skateboard is moving horizontally, Joe can jump how much higher?

no higher

The reason a satellite such as the space shuttle remains in orbit is because of the earth's _______

atmosphere

If a block is set sliding on a huge frictionless plane in contact with earth it will NOT continue to move at a constant speed because ________

gravity will pull in a non perp direction as the block gets farther out on the plane

rockets that launch satellites into orbit need less thrust when fired from

hawaii

if the sun collapsed to a black hole, the Earth's gravitational attraction to it would be

the same

When you roll a ball of the edge of the table the component of velocity that does not change ________

horizontal quantity

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