PHYSICS MIDDLE SCHOOL

Two spheres exert a gravitational attraction on each other. Which of the following changes to this system would reduce the gravitational attraction by one half?

Answers

Answer 1
Answer:

- Decreasing one of the masses to 1/2 of its original value

- Increasing the distance by a factor of √(2)

Explanation:

There are no options provided, however we can still answer the question.

In fact, the magnitude of the gravitational force between two objects is given by  the equation:

F=G(m_1 m_2)/(r^2)

where

G=6.67\cdot 10^(-11) m^3 kg^(-1)s^(-2) is the gravitational constant

m1, m2 are the masses of the two objects

r is the separation between them

We notice that:

  • The gravitational force is proportional to the product between the masses
  • The gravitational force is inversely proportional to the square of the distance between the masses

Therefore, in order to reduce the gravitational attraction by one half, we can do one of the following changes:

- Decreasing one of the masses to 1/2 of its original value: for example, if m_1'=(1)/(2)m_1, the gravitational force becomes

F'=G(m_1' m_2)/(r^2)=G((1)/(2)m_1m_2)/(r^2)=(1)/(2)(G(m_1m_2)/(r^2))=(1)/(2)F

- Increasing the distance by a factor of √(2): in fact, if r'=√(2)r, the gravitational force becomes

F'=G(m_1 m_2)/(r'^2)=G(m_1m_2)/((√(2)r)^2)=(1)/(2)(G(m_1m_2)/(r^2))=(1)/(2)F

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A 1.0-gram sample of solid iodine is placed in a tube and the tube is sealed after all of theair is removed. The tube and the solid iodine together weigh 27.0 grams.
.

The tube is then heated until all of the iodine evaporates and the tube is filled with iodine
gas. The weight after heating will be:













A)
26.0 grams



B)
27.0 grams



C)
28.0 grams



D)
more than 28.0 grams

Answers

I think 28.0 grams
You picked the right person zozo lol

The amount of matter contained in a given volume for a substance is called

Answers

The amount of matter contained in a given volume for a substance is called density. The correct answer is density.

Density is a physical property of matter that describes how much mass is present in a given volume. It is typically expressed in units such as kilograms per cubic meter (kg/m³) or grams per milliliter (g/mL).

The density of a substance is determined by its mass and volume and can be used to identify and compare different materials.

Therefore, The amount of matter contained in a given volume for a substance is called density. The correct answer is density.

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Answer:

Density

Explanation:

The amount of matter in a substance is its mass. In order to calculate the amount of matter in a given volume of a sample, you will use the density equation: density = mass/volume. ... The density of the elements are known and can be looked up in charts.

Dark clothing feels warmer than white clothing on a sunny day. Which interaction causes the dark clothing to feel warm?

Answers

Answer: Absorption

Explanation: Because the darker clothing absorbs the heat more than the lighter clothing beacuse of contrast i guess . A P E X

Explanation:

The darker the object, the better it emits heat, because it's a better absorber of light. On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light.

Because weight is a force, it is measured in ___________

Answers

Weight is a force.  This is a big part of the reason why weight
is described in terms of units of force. Some popular units of
force include newtons and pounds.
pounds because force is measured in pounds

Does only space have gravity?

Answers

Gravity causes every object to pull every other object toward it. Some people think that there is no gravity in space. In fact, a small amount of gravity can be found everywhere in space. Gravity is what holds the moon in orbit around Earth.

according to newtons second law of motion, when an object is acted on by an unbalanced force, how will that object respond?

Answers

Explanation:

Newton's second law of motion states that when a certain force is acted on an object then it is equal to the mass m of that object multiplied by the acceleration a of the object.

Mathematically, the relation is as follows.

                             F = m × a

Thus, we can conclude that when an object is acted on by an unbalanced force then the object will start to accelerate.



When an object is acted on by an unbalanced force, then that object will accelerate.
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