One day at soccer practice, you kick a ball hard and it rolls across the grass. It eventually comes to a stop because

Answers

Answer 1

Answer: Because of friction. The friction force from the grass onto the ball causes the force pushing the ball to decrease and eventually equal 0, so the ball comes to rest.

Answer 2

Answer: Becasue of friction. Friction has the ability to stop objects.

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In february a little town received snow on a daily basis. The first day they had 10 inches, 3 inches the second, 7 inches the 3rd, and 4 inches on the fourth day. What was the average snowfall?

Answers

The average snowfall of the four days was 6 inches.

What is snow?

When atmospheric water vapor freeze into small ice crystals and falling in small white flakes or lying on the ground as a white layer, it is called snow.

In the question it is said that,

Amount of snow received by the town on first day = 10 inches.

Amount of snow received by the town on second day = 3 inches.

Amount of snow received by the town on third day = 7 inches.

Amount of snow received by the town on fourth day = 4 inches.

Total amount of snow received by the town on these four days = ( 10 + 3+ 7 + 4) inches.

=24 inches.

Hence, average amount of snow received by the town on these four days = total amount of snow received ÷ 4

= ( 24 ÷ 4) inches.

= 6 inches.

Hence, the average snow received by the little town was 6 inches on those days.

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Answer:

The average is 6

Explanation:

To find the average, you have to first add all the numbers. After you add all the numbers up, then you divide by how many numbers there are. This one had 4 numbers so you divide by 4

How are mass and inertia related

Answers

inertia is the resistance of any physical object to any change in its state of motion. inertia exists due to the mass of the object

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom. Which change of state is shown in the model? condensation boiling sublimation freezing.

Answers

The change of state as depicted by the model is condensation.

What is Condensation?

The process by which the water vapors get converted into liquid droplets to get settled on a cold surface is known as condensation.

As per the given problem, the cylinder in the left has the balls evenly spaced throughout and the right cylinder has the balls in the form of layers at its bottom.

So, this clearly reflects that the comparing both the balls in both cylinders, the right cylinder consists of the balls undergone through the process of condensation.

This is because,

During condensation, the vapor molecules get converted into liquid.

And in the left cylinder, the balls evenly spaced have more intermolecular distance which designates the gaseous molecules.

While in the right cylinder, the layered form of gas shows that the conversion occurred to some state of molecules, having less intermolecular space.

And liquid has less intermolecular space than gas.

Thus, we can conclude that the change of state as depicted by the model is condensation.

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Answer:

Explanation:

condensation

the other ones just don't go

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Answers

75 km/hr, so in other words 75 km per hour.

7200 s / 60 = 120 min
120 min / 60 =2 hr
so 150 km / 2 hr = 75 km per hour

Answer:

The speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

Further Explanation:

Given:

The distance covered by the car is $150\,{\text{km}}$ .

The time taken by the car to cover the distance is $7200\,{\text{s}}$ .

Concept:

The speed of a car is the ratio of the distance covered by the car to the time taken by the car in covering the distance.

The expression for the speed of the car is:

$v = (d)/(t)$ …… (1)

Here, $v$ is the speed of the car, $d$ is the distance covered and $t$ is the time taken by the car.

Substitute the value of distance and time in the above expression.

$\begin{aligned}v &= \frac{{150\,{\text{km}}}}{{7200\,{\text{s}}\left( {\frac{{1\,{\text{hr}}}}{{60 * 60\,{\text{s}}}}} \right)}}\n&= \frac{{150}}{2}\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n&= 75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n\end{aligned}$

The speed of the car in terms of ${{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}$ can be expressed as.

$\begin{aligned}v&=75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}}{{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\left( {\frac{{1000\,{\text{m}}}}{{3600\,{\text{s}}}}} \right)\n&=75 *\frac{5}{{18}}\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n&= 20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n\end{aligned}$

Thus, the speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}}\right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

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Answer Details:

Grade:Middle School

Chapter:Speed and distance

Subject:Physics

Keywords:Speed, velocity, distance, time, distance of 150 km, in 7200 s, speed of the car, ratio of distance, rate of change of distance.

What does the atomic number tell us about an atom of a certain element?

Answers

It tells us the number of protons in the nucleus of each atom of that element.

The inner solar system contains theA)Jovian planets
B)terrestrial planets and asteroids
C)dwarf planets like Pluto

Answers

jovian planets and dwarf planets like pluto are in the outer part of our solar system. so, terrestrial planets ,which means earth like planets, live in the inner part of our solar system. or B. is the answer

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