PHYSICS MIDDLE SCHOOL

A person with a mass of 15kg is walking uphill at a velocity of2m/s. What is the walker's momentum?

Answers

Answer 1
Answer:

Answer:

30 kgm/s

Explanation:

The momentum of a body is given by the product of mass and  its velocity.

∴ momentum = mv

                        = 15 × 2

                        = 30 kgm/s

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What does it mean to say that the forces acting on an object are balanced?

Answers

Answer:

that would be for force and motion and it would be newtons laws and that would be like inertia

Explanation:

it would be the law of inertia: every action has a equal ad opposite reaction.

hope this helps :)

Answer:

If these are your answer choices:

A. The sum of the horizontal forces is zero.

B. All the forces combine to give zero net force.

C. The forces occur as pairs of forces with equal magnitude and direction.

D. The forces all have the same magnitude.

The correct answer is B. All the forces combine to give zero net force.

Please help me! URGENT!

Answers

A physical change is a change in which no new matters are formed.

Let's get started:
1. a rusting bicycle
This is NOT a physical change because a new substance is formed.
3Fe+ 2O2 -> Fe3O4

2. breaking glass
This is a physical change.

3. melting butter
This is a physical change.
You just change the phase of butter from solid to liquid, but still there is no new substance formed.

4. burning leaves
When you burn something organic, CO2 will be formed.
Therefore, this is NOT a physical change.

5. cutting your hair
This is a physical change.

6. frying an egg
When you fry an egg, iron (Fe) in the yolk reacts with hydrogen sulfide (H2S) in the white to form iron sulfide (FeS).
Therefore, this is NOT a physical change.

7. water evaporating
With the same reason as 3, this is a physical change.

8. mixing salt and water
This is a physical change (with the same reason as 3).
NaCl (s)+ H2O -> NaCl (aq)

Hope this helps~
A physical change only includes changes in state, not the bonds. 

Answer:- 

- breaking glass
- melting butter
- cutting your hair
- water evaporating. 
- mixing salt and water 

Write down the address of Earth in as much detail as possible

Answers

Position #3
Solar System
Orion Arm
Milky Way Galaxy
Universe
Mind of God

When the pressure at the bottom of a submerged object is _______than the pressure at the top of the submerged object a buoyant force is produced?THE ANSWER IS: GREATER THAN

Answers

greater is the keword here

When the pressure at the bottom of a submerged object is  less than the pressure at the top of the submerged object a buoyant force is produced?

Determine the weight of an average physical science textbook whose mass is 3.1 kilograms. The acceleration due to gravity is 9.8m/s2.

Answers

Given:

mass is 3.1 kilograms

The acceleration due to gravity is 9.8m/s2

 

Required:

Weight

 

Solution:

W = mg

W = (3.1 kilograms)( 9.8m/s2)

W = 30.38 Newtons

A pencil is dropped from the roof of the school what is the speed after 3s down is the negative direction.I'm confused on what equation to use

Answers

On Earth, the acceleration due to gravity is (-9.8 meters per second) per second.

If the school, the roof, and the pencil are on Earth,
then after 3 seconds, the pencil's speed is

[ (-9.8 meters per second)/second ] times [ 3seconds ] = -29.4 meters per second
you have to use 1st equation of motion v = u +at as distance(s) is not given.....
as pencil is dropped from rest therefore u = 0m/s and accleration due to gravity is = -9.8 m/s
v = 0 - (9.8)(3)
v = -29.4 m/s
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