Physics

Suppose you throw an apple horizontally. Neglecting air resistance, just after y

Suppose you throw an apple horizontally. Neglecting air resistance, just after y

Suppose you throw an apple horizontally. Neglecting air resistance, just after you release the apple from your hand, the net force on the apple is       

A) directed upward.
B) directed horizontally forward.
C) d

einsteindude   272   1 Reply

mel!811

Are you in orbit around anything?

Are you in orbit around anything?

Are you in orbit around anything?       
A) No, because you are at rest relative to space.
B) No, because you are at rest relative to Earth's surface.
C) Yes, you are in orbit around Earth's center.
D)

einsteindude   171   1 Reply

mel!811

An astronaut's normal weight it 600 newtons. How much will she weigh while orbit

An astronaut's normal weight it 600 newtons. How much will she weigh while orbit

An astronaut's normal weight it 600 newtons. How much will she weigh while orbiting in a satellite at 12,000 kilometers [two earth radii] above the surface of Earth?       

A) zero
B) 200 newtons
C) 67 newto

einsteindude   268   1 Reply

mel!811

A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of

A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of

A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of 6000 km [one Earth-radius] above Earth, its weight is       

A) zero.
B) 50,000 newtons.
C) 25,000 newtons.
D) 400,000 newtons

einsteindude   426   1 Reply

mel!811

Astronauts in orbit around Earth feel weightless because

Astronauts in orbit around Earth feel weightless because

Astronauts in orbit around Earth feel weightless because       
A) there is no gravity out there.
B) they must lose weight for the space program.
C) they are in "free fall" around Earth.
D) they are mov

einsteindude   362   1 Reply

mel!811

Astronauts, in satellites orbiting Earth, feel weightless. Are they really weigh

Astronauts, in satellites orbiting Earth, feel weightless. Are they really weigh

Astronauts, in satellites orbiting Earth, feel weightless. Are they really weightless?       
A) Yes, because the centrifugal force due to their circular motion balances the force of gravity.
B) Yes, because they are not in

einsteindude   327   1 Reply

mel!811

Compared to the gravitational force on a 1 kg object, the gravitational force on

Compared to the gravitational force on a 1 kg object, the gravitational force on

Compared to the gravitational force on a 1 kg object, the gravitational force on a 2 kg object is       
A) twice as large.
B) nine times larger.
C) four times larger.
D) the same.
E) None of the above.

einsteindude   307   1 Reply

mel!811

How is the gravitational force between two objects affected by changes in the ma

How is the gravitational force between two objects affected by changes in the ma

How is the gravitational force between two objects affected by changes in the masses of the objects and by changes in the distance between the two objects?       

A) The force decreases with increased mass, and increases wit

einsteindude   255   1 Reply

mel!811

Imagine that you could magically move the moon closer to Earth, so that the dist

Imagine that you could magically move the moon closer to Earth, so that the dist

Imagine that you could magically move the moon closer to Earth, so that the distance from Earth to moon is cut in half. This would cause the force that Earth exerts on the moon to be       

A) halved.
B) doubled.

einsteindude   359   1 Reply

mel!811

Suppose we could magically double the mass of the moon, double the mass of Earth

Suppose we could magically double the mass of the moon, double the mass of Earth

Suppose we could magically double the mass of the moon, double the mass of Earth, and double the distance between Earth and the moon, all at the same time. How would this affect the force that the moon exerts on Earth?       

einsteindude   347   1 Reply

mel!811

Suppose we could magically triple the distance between Earth and the moon. This

Suppose we could magically triple the distance between Earth and the moon. This

Suppose we could magically triple the distance between Earth and the moon. This would cause the gravitational force by Earth on the moon to be       

A) increased to three times its former value.
B) reduced to 1/9 of i

einsteindude   555   1 Reply

mel!811

The acceleration of the moon is

The acceleration of the moon is

The acceleration of the moon is       
A) directed toward Earth
B) zero.
C) directed outward away from earth
D) directed along its forward direction of motion
E) None of the above.

einsteindude   343   1 Reply

mel!811

The important similarity that Newton noticed between a falling apple and the moo

The important similarity that Newton noticed between a falling apple and the moo

The important similarity that Newton noticed between a falling apple and the moon was that       
A) the net force on both is away from Earth, i.e., outward from the center of Earth.
B) the velocities of both are toward Eart

einsteindude   238   1 Reply

mel!811

If you weighed 800 newtons on Earth, how much would you weigh at 6000 km [one Ea

If you weighed 800 newtons on Earth, how much would you weigh at 6000 km [one Ea

If you weighed 800 newtons on Earth, how much would you weigh at 6000 km [one Earth radius] above the surface of Earth?       

A) 800 newtons
B) 1600 newtons
C) 400 newtons
D) 200 newtons
E) 3200 newtons

einsteindude   343   1 Reply

mel!811

Velma, the space woman, orbiting at 100 miles above earth's surface, feels weigh

Velma, the space woman, orbiting at 100 miles above earth's surface, feels weigh

Velma, the space woman, orbiting at 100 miles above earth's surface, feels weightless because       
A) she is away from the pull of earth's gravity.
B) she is falling freely around Earth.
C) she went on a di

einsteindude   326   1 Reply

mel!811

What other force balances the downward pull of gravity on a NASA satellite while

What other force balances the downward pull of gravity on a NASA satellite while

What other force balances the downward pull of gravity on a NASA satellite while it is in orbit around Earth?       

A) The acceleration.
B) Centrifugal force.
C) The velocity.
D) A balancing force is not n

einsteindude   412   1 Reply

mel!811

Which of the following would increase the gravitational force between two object

Which of the following would increase the gravitational force between two object

Which of the following would increase the gravitational force between two objects?       
A) Reducing the mass of either one of the objects.
B) Moving the two objects farther apart.
C) Moving the two objects closer tog

einsteindude   201   1 Reply

mel!811

Which of the following has the effect of reducing the gravitational force betwee

Which of the following has the effect of reducing the gravitational force betwee

Which of the following has the effect of reducing the gravitational force between two objects?       
A) Moving the two objects closer together.
B) Moving the two objects farther apart.
C) Increasing the mass of either

einsteindude   261   1 Reply

mel!811

You hold an apple in one hand and an orange in the other. If you doubled the mas

You hold an apple in one hand and an orange in the other. If you doubled the mas

You hold an apple in one hand and an orange in the other. If you doubled the mass of the apple and tripled the mass of the orange, without changing the distance between them, the gravitational force between them would be       

einsteindude   419   1 Reply

mel!811

You hold an apple in one hand and an orange in the other. If you doubled the mas

You hold an apple in one hand and an orange in the other. If you doubled the mas

You hold an apple in one hand and an orange in the other. If you doubled the mass of the apple and tripled the mass of the orange, without changing the distance between them, the weight of the orange [on Earth] would be       

einsteindude   252   1 Reply

mel!811

If you somehow increased Earth's radius, without changing its mass, would this a

If you somehow increased Earth's radius, without changing its mass, would this a

If you somehow increased Earth's radius, without changing its mass, would this affect your weight?       
A) Yes, your weight would decrease.
B) No, because the force of gravity on your body depends only on your mass an

einsteindude   348   1 Reply

mel!811

How strongly, and in what direction, does a 1-newton apple pull on Earth?

How strongly, and in what direction, does a 1-newton apple pull on Earth?

How strongly, and in what direction, does a 1-newton apple pull on Earth?       
A) It pulls upward, with a force that is much smaller than 1 newton.
B) It pulls upward, with a force that is much larger than 1 newton.

einsteindude   236   1 Reply

mel!811

Which of the following has the effect of reducing the gravitational force betwee

Which of the following has the effect of reducing the gravitational force betwee

Which of the following has the effect of reducing the gravitational force between two objects?       
A) Moving the two objects closer together.
B) Increasing the mass of either one of the objects.
C) Both of the above

einsteindude   311   1 Reply

mel!811

When you are in a high-flying jet plane, does either your weight or your mass di

When you are in a high-flying jet plane, does either your weight or your mass di

When you are in a high-flying jet plane, does either your weight or your mass differ from their normal value as measured on the ground?       

A) Both your weight and your mass are slightly reduced.
B) Your weight is s

einsteindude   325   1 Reply

mel!811

Velma, the space woman, is orbiting above Earth's surface in a low-altitude orbi

Velma, the space woman, is orbiting above Earth's surface in a low-altitude orbi

Velma, the space woman, is orbiting above Earth's surface in a low-altitude orbit. Does she actually have weight, or is she actually weightless, and why?     

A) She is weightless because she is in a vacuum.
B) S

einsteindude   571   1 Reply

mel!811

Mort weighs 700 newtons on Earth. He takes a low-orbit voyage in an Earth satell

Mort weighs 700 newtons on Earth. He takes a low-orbit voyage in an Earth satell

Mort weighs 700 newtons on Earth. He takes a low-orbit voyage in an Earth satellite. While in orbit his apparent weight [his feeling of weight] is       

A) a little more than 700 newtons.
B) zero.
C) a little le

einsteindude   381   1 Reply

mel!811

If gold were always sold by weight, could you make money buying gold at one alti

If gold were always sold by weight, could you make money buying gold at one alti

If gold were always sold by weight, could you make money buying gold at one altitude above the ground and selling it at a different altitude?       

A) Yes, you could make money by buying gold at a lower altitude and selling

einsteindude   328   1 Reply

mel!811

Does Earth's gravity pull more strongly on a block of wood or on a block or iron

Does Earth's gravity pull more strongly on a block of wood or on a block or iron

Does Earth's gravity pull more strongly on a block of wood or on a block or iron having the same size? Neglecting air resistance, which one falls faster when dropped?       

A) Gravity pulls equally strongly on both, an

einsteindude   485   1 Reply

mel!811

How did Newton deduce the dependence of the gravitational force on distance?

How did Newton deduce the dependence of the gravitational force on distance?

How did Newton deduce the dependence of the gravitational force on distance?       
A) By observing the way that a large gravitational pendulum moved.
B) By calculating the moon's acceleration, and comparing it with the

einsteindude   284   1 Reply

mel!811

A white dwarf star is about the size of

A white dwarf star is about the size of

A white dwarf star is about the size of       
A) Earth.
B) the sun.
C) a highway truck.
D) the head of a pin.
E) Actually, it doesn't have any size at all.

einsteindude   221   1 Reply

mel!811

According to current theories, how did the sun's planets get here?

According to current theories, how did the sun's planets get here?

According to current theories, how did the sun's planets get here?       
A) After the sun had formed, it gathered fully-formed planets from various places as the sun moved through the galaxy.
B) A passing star tore off

einsteindude   293   1 Reply

mel!811

In the final phases of its "life", our sun will

In the final phases of its "life", our sun will

In the final phases of its "life", our sun will       
A) collapse to become a white dwarf.
B) blow up in a supernova explosion.
C) turn into a cockroach.
D) collapse and continue to collapse, forever.

einsteindude   303   1 Reply

mel!811

Our sun will conclude its life as

Our sun will conclude its life as

Our sun will conclude its life as       
A) a daffodil.
B) a white dwarf.
C) a black hole.
D) a neutron star.
E) a red giant.

einsteindude   248   1 Reply

mel!811

The least massive stars, including our sun, eventually end their lives as

The least massive stars, including our sun, eventually end their lives as

The least massive stars, including our sun, eventually end their lives as       
A) quasars.
B) red giants.
C) black holes.
D) white dwarfs.
E) neutron stars.

einsteindude   240   1 Reply

mel!811

What originally caused the sun to heat up?

What originally caused the sun to heat up?

What originally caused the sun to heat up?       
A) A nearby supernova explosion that occurred during the early stages of the formation of the sun.
B) The gases from which it formed had already been heated by the Big Bang.

einsteindude   375   1 Reply

mel!811

Where did Earth come from?

Where did Earth come from?

Where did Earth come from?       
A) A passing star tore off part of the sun, and this part developed into Earth.
B) Earth was originally one of Jupiter's moons.
C) From the same collapsing gas cloud that gathered

einsteindude   229   1 Reply

mel!811

Is there any actual evidence that our solar system originate from a collapsing c

Is there any actual evidence that our solar system originate from a collapsing c

Is there any actual evidence that our solar system originate from a collapsing cloud of gas, as described in the textbook?     

A) Evidence comes from observations of gas clouds around new stars elsewhere in our galaxy.

einsteindude   233   1 Reply

mel!811

There are three types of collapsed, burned-out stars: black holes, white dwarfs,

There are three types of collapsed, burned-out stars: black holes, white dwarfs,

There are three types of collapsed, burned-out stars: black holes, white dwarfs, and       
A) X-ray stars.
B) neutron stars.
C) supernova.
D) quasars.
E) red giants.

einsteindude   298   1 Reply

mel!811

There are three types of collapsed, burned-out stars: white dwarfs, neutron star

There are three types of collapsed, burned-out stars: white dwarfs, neutron star

There are three types of collapsed, burned-out stars: white dwarfs, neutron stars, and       
A) quasars.
B) black holes.
C) supernova.
D) red giants.
E) X-ray stars.

einsteindude   345   1 Reply

mel!811

There are three types of collapsed, burned-out stars: black holes, neutron stars

There are three types of collapsed, burned-out stars: black holes, neutron stars

There are three types of collapsed, burned-out stars: black holes, neutron stars, and       
A) supernova.
B) X-ray stars.
C) quasars.
D) red giants.
E) white dwarfs.

einsteindude   451   1 Reply

mel!811