PHYSICS MIDDLE SCHOOL

The slope on a distance-time graph shows a ball moving from 20 m to 40 m in 1 s and from 40 m to 80 m in the next second

Answers

Answer 1

Answer:

Slope in the first second: 20 m/s

Slope in the next second: 40 m/s

Average slope: 30 m/s

Explanation:

On a distance-time graph, the slope of the curve represents the speed of the object.

In fact, we have:

The distance covered is the change in the y-variable, so $\Delta y$
The time elapsed is the change in the x-variable, so $\Delta x$

Speed is the ratio between distance and time, therefore

$speed = (distance)/(time)=(\Delta y)/(\Delta x)$

which corresponds to the slope of the line.

In this problem, we have a ball moving from 20 m to 40 m in 1 s, so

$distance = 40-20 = 20 m = \Delta y$

$time = 1 s = \Delta x$

So the slope in the first second is

$(\Delta y)/(\Delta x)=(20)/(1)=20 m/s$

In the next second, the ball moves from 40 m to 80 m, so

$distance = 80-40 = 40 m = \Delta y$

$time = 1 s = \Delta x$

So the slope in the next second is

$(\Delta y)/(\Delta x)=(40)/(1)=40 m/s$

While if we consider the overall graph in the 2 seconds, we have

$distance = 80-20 = 60 m = \Delta y$

$time = 2 s = \Delta x$

So the average slope is

$(\Delta y)/(\Delta x)=(60)/(2)=30 m/s$

Learn more about speed:

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Why don't the present shapes of the continents fit perfectly into the supercontinent?

Answers

The reason why the shapes of the continents as of today do not perfectly fi into to super continent because long time ago the super continent was scattered into pieces. And as times go by, those smaller parts of super continents undergo soil erosion caused by the water and other way that causes their original shapes change.
Thus, if we are going to judge now if those smaller part of super continent, they’re no longer gonna fit perfectly because through time their original form changed

. An object’s resistance to change in motion is dependent solely on what quantity?

Answers

Answer : Mass

Explanation : An object's resistance to change in motion is solely dependent on the mass of the quantity. The tendency to resist the change in motion is called as inertia. Which is highly influenced by the factor called "mass" of the object. The mass of the quantity will decide the direction for change in the motion of a particular object.

It is dependent upon the object's mass. The greater the mass of the object greater will be the inertia of the object, and hence it's resistance to change in motion as well.

The weight of a person is 500N and his foot imprint is 0.5 m square. Calculate the total pressure exerted by a person when he stands on both feet.

Answers

The total pressure exerted by a person when he stands on both the feet is 10000000 Pascals

Explanation:

Given data

Weight of the person= 500 N

Area of the foot= 0.5 m ²/ 100 ×100

To find the pressure exerted we have the formula,

Pressure exerted= force/area

Pressure exerted= 500 ×100×100/0.5

Pressure exerted=10000000 Pascals

The total pressure exerted by a person when he stands on both the feet is 10000000 Pascals

3. Three metal spoons are on a table. They are each at room temperature. If the three spoonstouch,
heat will flow among all three spoons.
heat will flow between two spoons.
no heat will flow among the spoons.
o heat will flow from the spoons to the air.

Answers

If the spoons touch, no heat will flow among the spoons. This is because they are already at thermal equilibrium with each other. This is hinted by the statement "they are at room temperature" which means they all have the same temperature. Heat only flows when there is a difference in temperature.

Energy is measured in units called what?

Answers

The unit of energy is called the joule (J). Energy is measured in joules (J)

The joule is named after the English physicist James Prescott Joule. It is defined as the energy transferred to an object when a force of one newton acts on it through a distance of one meter. Other units of energy include the calorie (cal), the kilowatt-hour (kWh), and the British thermal unit (BTU).

The calorie is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The kilowatt-hour is the amount of energy used by a 1,000-watt appliance in one hour. The British thermal unit is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.

The joule is the most commonly used unit of energy in physics and engineering. It is also the unit of energy used in the International System of Units (SI).

To know more about theEnergy, here

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the SI unit of Energy is called the Joule.

i hope this is what your question was about. :)

which is the correct order of processes that occur for water to move from a lake to a cloud and then turn into rain

Answers

I think this process is called The Water Cycle.

First, the water from the lake is heated from the heat of the sun. Then as the water gets heated, it evaporates in the form of water vapor towards the sky. (Because hot air is lighter and goes up). Now, as the water vapor goes above....it gathers up in the form of cloud. And as the climate gets cooler and cooler ......the water vapor then starts to condense and drop down to the earth in the form of rain. The rainwater gets accumulated into the water sources by various means and the whole process goes again and again.

Fun Fact:
Rain water is the purest form of water if not mixed with the dust and pollution in our surrounding.

Also.....i attached a picture.....feel fee to look at it

This process is The Water Cycle

Evaporation is process in which the sun heats the water and this heating causes the water to rise up through the clouds.

Condensation is the process of combination among water and particles of the earths atmosphere

Precipitation is when the water precipitate because the clouds can not resist to much mass of water and if it snow falls is because temperature is peaked at above freezing causing the water to freeze and that is how snow is converted

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