Physics Middle School

## Answers

**Answer 1**

Answer:

If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases. If the distance is doubled, the force of gravity is one-fourth as strong as before.

## Related Questions

As a result the pressure of the basketball is _____\ in the winter

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Timothy plays basketball in his driveway during the summer. By accident, he left the basketball outside during the winter. He tried to bounce it, but it would not bounce because it was partially deflated. During the winter, air molecules in the basketball move slower than in the summer. As a result, the pressure of the basketball is reduced in the winter.

Explanation:

The movement of air molecules in the basketball will maintain the pressure in the ball thus keeping its shape perfect. As summer has high temperature of air molecules and it is known that temperature is directly proportional to the pressure of the molecules. So in summer the air molecules will move fast inside the ball.

But in winter, the temperature of air molecules decreases leading to reduction in the speed of air molecules and thus when it enters the ball, it fails to strike the walls of the ball with same pressure. This leads to flattening of the ball as the pressure of the basketball is reduced in winter.

A ball which is dropped from the top of a building strikes the ground with a speed of 30m/s. Assume air resistance can be ignored. The height of the building is approximately

### Answers

Answer:

h= 45.87 m.

Explanation:

Data given:

Vf= 30m/s , and we know that g = 9.8 m/s²

The ball has an initial velocity of zero Vi = 0 m/s²

To Find:

Height of the building = ?

Solution:

According to 3rd law of the motion;

2aS= Vf² - Vi² ( S= h , a=g)

2*9.81*h = (30)² - (0)²

h= 45.87 m.

What is the formula to find an objects acceleration

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Answer:

Vf-Vi divided by time

Explanation:

Answer:

Explanation:

In which of the following statements would the impact of gravity be the least? earth is pulled toward the Sun. Humans are pulled toward earth. The moon is pulled toward earth. The Sun is pulled toward the moon.

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Answer:

The sun is pulled toward the moon.

Explanation:

It is the sun is pulled toward the moon because the moon doesn't have a great enough gravitational force or mass to pull the sun, so it must be some external force.

Water has a density of 1.0 g/cm3 and about 25 percent of the block is below water. What is a good estimate of the density of the block? A 0.25 g/cm3 B 0.50 g/cm3 C 0.75 g/cm3 D 1.0 g/cm3

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Answer:

A 0.25 g/cm3

Explanation:

At equilibrium, the buoyant force acting on the block (B, upward) is equal to its weight (W, downward):

where

is the water density

is the part of the volume of the block immersed in the water

g is the acceleration of gravity

is the density of the block

V is the volume of the block

Re-arranging the equation,

where we know:

, since the fraction of volume immersed is 25%

Substituting,

Answer:

0.25 g/cm^3

Explanation:

Is balancing a rock while climbing physics, chemistry or biology

### Answers

Answer:

Physics

------------------

Answer: It's definitely physics

Explanation:

Look up each definition and it'll help you confirm the answer...Please mark as Brainliest...I haven't had one in a while...

Is burning paper physics, chemistry or biology?

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Answer:

Chemistry I believe

Explanation:

2. An airplane traveling north at 220. meters per second encounters a 50.0-meters-per-second crosswind from west to east, as represented in the diagram below.

What is the resultant speed of the plane?

(1) 170. m/s

(2) 214 m/s

(3) 226 m/s

(4) 270. m/s

220. m/s

50.0 m/s

### Answers

The resultant of the speed of the plane is 226 m/s.

The given parameters;

- initial velocity of the plane, u = 220 m/s north
- velocity of the crosswind, v = 50 m/s west

The resultant of the speed of the plane is calculated by applying Pythagoras theorem as shown below;

R = 220² + 50²

R = 50900

R = √50900

R = 225.61 m/s

R ≈ 226 m/s.

Thus, the resultant of the speed of the plane is 226 m/s.

Learn more here:brainly.com/question/12982473

The resultant speed of the plane is (3) 226 m/s

Why?

We can calculate the resultant speed of the plane by using the Pythagorean Theorem since both speeds are perpendicular (forming a right triangle).

So, calculating we have:

Hence, we have that the resultant speed of the plane is (3) 226 m/s

Have a nice day!

a car comes to a complete stop after traveling at 56m/s if it takes 5200 milliseconds to stop how much distance did it cover

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Answer:

A car covers distance of 291.2 m if the car is travelled at speed of 56 m/s in 5200 milliseconds.

Explanation:

To find the distance covered by the car we use the the relationship between speed, time and distance is . Given, speed = 56 m/s and time = 5200 milliseconds. Covert milliseconds into seconds we can get by dividing it with 1000 = = 5.2 seconds.

Now,

Thus a car can travel 291.2 m if the car is travelled at speed of 56 m/s in 5200 milliseconds.

What is a characteristic of a metamorphic rock

### Answers

Rarely has any openings. Metamorphic rocks is an alteration of an existing rock using either heat or pressure.

In your own words explain coefficient of friction?

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Answer:

A coefficient friction is a value that shows the relationship between two objects and the normal reaction between the objects that are involved.

Explanation:

Which vehicle will have more kinetic energy, a parked semi truck or a car going 50 km/h?

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A car going at 50 km/h will have more kinetic energy.

Explanation:

Kinetic energy of an object is produced when the object is in motion. It is known that kinetic energy is directly proportional to the mass of the object and also to square of velocity or speed experienced by the object.

So, a parked semi-truck will have zero kinetic energy as the speed or velocity of the semi-truck is zero. Thus, the kinetic energy will be zero for a parked semi-truck. While as there is speed for the car moving at 50 km/h, hence, it will exhibit higher kinetic energy compared to parked semi-truck.

What is meant by the term friction?

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The resistance that one surface or object encounters when moving over another.

"a lubrication system that reduces friction”

A car starts from rest and accelerates at a constant rate. After the car has gone 50 m it has a speed of 21 m/s. What is the acceleration of the car? O A. 2.4 m/s2

O B. 4.4 m/s2

O C. 5.5 m/s2

O D. 0.23 m/s2

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Answer:4.41ms-2

Explanation:

From rest U=0,therefore when given S=50m and V=21m/s then you apply the formula of linear motion which is V^2=U^2+2as

Then substitute for the given values and reach the answer e.g 21^2=(0)^2+2×a×50

441m/s=100ma

a=4.41ms-2

A train moves east with a speed of 45 m/s. A man on the train walks west with a speed of 0.4 m/s relative to the train. How long does it take the man to

move 10 m relative to the train?

A. 0.22 S

B. 12 s

C. 32 S

D. 25 s

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Answer: D. 25s

Explanation:

speed = distance travelled/time taken

Or:

v =

∴ t = = = 25s

Therefor, the answer is 25s or D.

* Hopefully this helps:) Mark me the brainliest:)!!!

Atomic particles that orbit the nucleus are:_______ protons, neutrons, electrons, atoms

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Atoms is the answer

When u step on the brakes what energy transformation takes place describe the transformation

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The brakes become extremely hot as a result of the conversion of kinetic energy to thermal energy when the brake pads rub against the brake drums. Nearly all the chemical energy contained in fuel has been transformed into thermal energy by the time a car comes to a halt. 1.

What energy transformation when u step on the brakes?

In contemporary vehicles, friction braking is the most often employed braking technique. Through the use of friction on a system's moving parts, kinetic energy is transformed into thermal energy. The velocity finally decreases to zero due to the friction force's resistance to motion and subsequent production of heat.

The most popular braking technique in contemporary vehicles is friction braking. By adding friction to a system's moving parts, it entails turning kinetic energy into thermal energy.

Therefore, As a result of the friction force's resistance to motion and the heat it causes, the velocity finally comes to a stop.

Learn more about transformation here:

brainly.com/question/29102331

#SPJ2

Before you step on the brakes, the car has kinetic energy, when you step on the brakes, it turns the kinetic energy into heat (thermal energy). When it stops completely, it has potential energy. Hope this helped :)

The process of achieving fitness in the human body is almost instant and can occur overnight. True or False

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This statement is false nothing in the human body can occur overnight

Answer:

False is the answer

Explanation:

don't worry i took the test

How long will it take an object to hit the ground if dropped from 100 meters

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Answer:

The answer depends on what object you are dropping. Are you dropping a balloon or a car? (I'm joking 'bout that one.) If the mass of the object is very little, then it might drop slower. If the mass is bigger, then it might drop faster.

Good luck!

Explanation:

Answer:10.24

Explanation: well, the acceleration of gravity is 9.8m/s².So, gravity pulls objects down at this rate

so now we divide 100/9.8 and we get our answer which is 10.24 seconds(APPROX)

A man pushes a lawn mower on a level lawn with a force of 186.5 N. If 3.8% of this force is directed downward, then how much work is done by the man in pushing the

mower 7.4m?

### Answers

Explanation:

The force is 186.5 N. 3.8% of the force is directed downward. So the vertical component of the force is:

Fᵧ = 0.038 (186.5 N)

Fᵧ = 7.087 N

The horizontal component is found with Pythagorean theorem:

F² = Fₓ² + Fᵧ²

(186.5 N)² = Fₓ² + (7.087 N)²

Fₓ = 186.4 N

So the work done is:

W = Fd

W = (186.4 N) (7.4 m)

W = 1379 J

Round as needed.