Question

Which statements about surface gravity are true?
Select all that apply.
a. Earth's surface gravity has no effect on the tides.
b. A 180-pound person on Earth weighs 30 pounds on the moon.
c. A space ship has the same mass on Earth as it has on the moon.

Answer 1

The statement about gravity that true is (A) and (C).

Introduction

Hi ! Here I will help explain about gravity. Gravity is one part of the force that will pull two or more objects that interact with each other to the center of their weight. The characteristic of gravity are:

1. Force is formed from at least two objects interacts with each other.
2. Mass cannot be affected by gravitational acceleration, because mass itself has formed gravitational interactions.
3. The weight of an object is something that can be affected by the acceleration of gravity, because weight is a derived quantity in Newtons (N)

Explanation

Let's examine the statements given in the problem:

Earth's surface gravity has no effect on the tides.

This statement is true, the tides are caused by the gravitational force possessed by the Moon. Although, the moon itself orbits the Earth due to the gravitational force possessed by the Earth.

A 180-pound person on Earth weights 30 pounds on the moon.

This is false. Earth and the moon really have a difference in gravity where on the moon the acceleration due to gravity is 1/6 that of Earth. However, pound is a non-standard unit of mass, although it still describes a "mass" quantity. Mass is not affected by the acceleration due to gravity.

A space ship has the same mass on Earth as it has on the moon.

This is true. Based on the previous point, if the mass is not affected by the acceleration due to gravity. So, the value will remain the same wherever the object is located.

Conclusion :

So, the statement about gravity that true is (A) and (C).

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