Question 1

If the sun somehow became twice as massive,your weight as normally measured here on Earth would

Accepted Answer

The weight of an object is determined by the gravitational force acting upon it. The gravitational force is dependent on the mass of the objects attracting each other and the distance between them. Since the distance between the sun and the earth would not change, and the mass of the earth would remain the same, the weight of a person on Earth would not change if the mass of the sun were to double. Therefore, the correct choice is C, not change.

Question 2

Suppose the moon had twice as much mass as it now does and still orbited the Earth at the same distance.In that case,the ocean bulges on Earth would be

Accepted Answer

The strength of gravitational force exerted by the moon on Earth determines the size of the ocean bulges. If the moon had twice its current mass, it would exert a stronger gravitational force on Earth, resulting in larger ocean bulges. Therefore, the correct choice is A) larger.

Question 3

On a given day,tides rise and fall at

Accepted Answer

Tides are affected by a variety of factors including the position of the sun, moon, and planets, wind patterns, and the shape of the coastline. As a result, tides rise and fall at different times and different distances in almost every location. Therefore, option C is the correct choice.

Question 4

Which is most responsible for the ocean tides?

Accepted Answer

The ocean tides are mostly controlled by the gravitational pull of the moon. The sun also plays a role, but it is less significant compared to the moon. The gravitational pull of the moon causes the sea level to rise and fall, resulting in tidal cycles.

Question 5

The Earth is closer to the sun in January than in July,which accounts for the fact that the highest high tides in the northern hemisphere occur in

Accepted Answer

The Earth is closer to the sun in January during the winter season, and this results in stronger gravitational pulls on the Earth by the sun and moon. This gravitational force causes higher tides, known as "king tides," in the Northern Hemisphere. Therefore, the highest high tides in the northern hemisphere occur in winter.

Question 6

The best time for digging clams (when the low tide is extra low)is during the time of the

Accepted Answer

The new or full moon corresponds with the highest tides, as the sun, moon, and Earth are aligned, resulting in the greatest difference between high and low tides. Therefore, during a new or full moon, the low tide is extra low, making it the best time for digging clams.

Question 7

A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude.The supplier should

Accepted Answer

At higher altitudes, the gravitational pull is slightly weaker, so the weight of the metal would be slightly less compared to at lower altitudes. Buying at a high altitude and selling at a low altitude would result in a profit due to the increased weight measurement at lower altitudes.

Question 8

How far must one travel to get away from the Earth's gravitational field?

Accepted Answer

The Earth's gravitational field extends infinitely, although it weakens with distance. You cannot completely escape it, as gravity is a fundamental force that acts over infinite distances.

Question 9

Which pulls on the oceans of the Earth with the greater force?

Accepted Answer

The sun exerts a greater gravitational force on the Earth's oceans than the moon due to its much larger mass, despite being farther away. However, the moon has a greater effect on tides because its gravitational pull varies more across the Earth's surface.

Question 10

The origin of any micro tides in the human body is most likely the

Accepted Answer

The answer of The origin of any micro tides in...

Question 11

A hollow spherical planet is inhabited by people who live inside it,where the gravitational field is zero.When a very massive space ship lands on the planet's surface,inhabitants find that the gravitational field inside the planet is

Accepted Answer

The gravitational field inside the hollow spherical planet is zero because gravity cancel out due to the shell theorem. However, once a massive object like a spaceship lands on the surface, it creates a non-zero gravitational field inside the planet, directed towards the spaceship. This is because the mass of the spaceship is not distributed evenly throughout the hollow sphere, creating a gravitational pull towards it.

Question 12

Tidal forces in general are the result of

Accepted Answer

Tidal forces are the result of unequal forces acting on different parts of a body, such as the gravitational pull of the Moon on the Earth's oceans, causing tides.

Question 13

Which of these three produces the greatest tidal effect on you right now?

Accepted Answer

The Earth produces the greatest tidal effect on you because it is the closest massive body, exerting a strong gravitational pull that keeps you grounded.

Question 14

For lunar tides to occur in the human body

Accepted Answer

The answer of For lunar tides to occur in the...

Question 15

The main reason ocean tides exist is that the pull of the moon

Accepted Answer

The gravitational force of the moon on Earth's oceans is greater on the side of the Earth that is closer to the moon, causing a bulge in the water known as high tide. On the opposite side of Earth, there is also a high tide because the water is being pulled away from the Earth. This results in a second bulge on the far side of Earth. The areas between these two bulges experience low tide. The sun's gravitational force also affects tides, but because it is farther away, its effect is weaker than that of the moon.

Question 16

Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper.The reason for this is the

Accepted Answer

The answer of Each of us weighs a tiny bit...

Question 17

Which produces a greater tidal effect in your body,the moon or a 1-kg melon held above your head?

Accepted Answer

The gravitational force exerted by the melon, due to its proximity, is greater than the tidal effect of the moon, which is much farther away.

Question 18

When you step on a weighing scale at noon,the Earth pulls you down and the overhead sun pulls you upward.The reason the sun's pull doesn't decrease your weight at noon is because

Accepted Answer

At noon, when you step on a weighing scale, you, the scale, and the Earth are in free fall around the sun. This means that the gravitational forces between you, the scale, and the Earth are balanced, and you don't feel the effect of the sun's pull on you. It's like being in an elevator that's falling freely - you feel weightless because the force of gravity is not acting on you.

Question 19

We do not observe tides in a community swimming pool because

Accepted Answer

The gravitational pull from the moon affects large bodies of water like oceans, where there is a significant difference in distance across the body of water. In a swimming pool, all parts are nearly equidistant from the moon, so the tidal effect is negligible.

Question 20

During an eclipse of the sun the high ocean tides on Earth are

Accepted Answer

During a solar eclipse, the sun, moon, and Earth are aligned, which enhances the gravitational pull on the Earth's oceans, leading to extra high tides known as spring tides.

Quiz 9: Gravity