A rock falls off the edge of a cliff and strikes the ground after 3.8 s. What is the height of the cliff? Assume air resistance is negligible.

Answers

Answer 1

Answer: Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Use the formula:
h = vo*t - (1/2)gt^2

Since the rock experiences freefall, initial velocity (vo) is zero:
h = -(1/2)gt^2

Substitute:
h = -(1/2)(-9.8)(3.8^2)
h = 70.756

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Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

Answer:

The other person who answered is incorrect- the real answer is light.

Explanation:

A mechanical wave is a wave that requires a medium. A medium is any substance that has a defined set of physical properties and can transmit energy. A medium can be a solid, liquid, or gas. Some examples of a medium include an iron bar, the ground, water, lava, air, and helium in a balloon.

The answer is not sound because sound travels through waves through the air. If you were to put a source of sound in a container that contains no air, you would not be able to hear the sound through the container. Since sound has a wave and a medium, it is a mechanical wave.

The answer is not waves in the ocean because, obviously, this is a wave. Its medium is the water. Since it has a wave and a medium, it is a mechanical wave.

The answer is not waves in a wheat field because, again, this is a wave. The medium is the air. Since it has a wave and a medium, it is a mechanical wave.

The answer is light. Light travels through electromagnetic waves. However, it does not require a medium. Light can travel not only through air and solid materials, but also through the vacuum of space. Since light does not require a medium, it is not a mechanical wave.

I hope this helps !! :)

ocean waves because its not artificial

What causes objects to fall on earth and what is the rate at which this occurs?

Answers

Newton called it "Universal Gravitation".
Now, most people call it "gravity".

What gravity does is:

It causes there to be forces that pull every speck of mass in the
universe toward every other speck of mass in the universe.

-- If you just think about two gobs of mass, then there are two forces
of gravity.

-- One force pulls gob-A toward gob-B, and the other force
pulls 'B' toward 'A'.

-- The strengths of both forces are EQUAL.

-- The strength depends on the product of the two masses.

It doesn't matter if the masses are the same or if one is ginormous
and the other is minuscule. It's the product that counts.
Bigger product ==> stronger force.
Smaller product ==> weaker force.

-- The strength also depends on the distance between the two masses.
Farther apart ==> weaker force.
Closer together ==> stronger force.

-- When you hold a rock in your hand, there are forces of gravity
between the rock and the Earth.

-- When you let go of the rock, one force pulls the rock toward
the Earth. You call that force "The weight of the rock".

-- The other force force pulls the Earth toward the rock.

-- The forces are equal. The rock's weight on Earth is equal to
the Earth's weight on the rock.

-- Force applied to a mass causes the mass to accelerate in the
direction of the force.

-- The force on the rock causes it to accelerate toward the Earth.
We call that the act of "falling".

-- The force on the Earth causes it to accelerate toward the
rock. Nobody ever notices that, nobody ever talks about it,
and you are thinking that I am full of merren tzimmes. But it's
true. I swear it. You could look it up. Furthermore, I laugh at
your derogatory remark, because it is often true and my wife's
merren tzimmes is delicious.

-- The reason we never notice it is: When equal forces are applied
to two different masses, the smaller mass accelerates more, and the
bigger mass accelerates less.

When you allow the 1-kilogram rock and the Earth to accelerate
toward each other under the influence of the equal gravitational
forces between them, they do indeed accelerate toward each other.

BUT ... the mass of the Earth is roughly

   5,972,000,000,000,000,000,000,000 times

the mass of the rock, so the acceleration of the rock is roughly

   5,972,000,000,000,000,000,000,000 times

the acceleration of the Earth.

So the falling of the rock toward the Earth is substantially more
obvious than the falling of the Earth toward the rock.

-- The rate of acceleration of any object falling on or near
the Earth's surface is 9.8 m/s² .

That means that the object's speed increases steadily and
continuously. At any instant, the speed at which it's falling
is 9.8 meter/sec faster than it was 1 second earlier.

Heat transfer within a fluid takes place bya. convection currents.
b. radiation.
c. conduction.
d. density.

Answers

Heattransfer within a fluid takes place by convectioncurrents. The correct option is a.

Convection currents are principally responsible for heat transmission within a fluid. Heat is transferred through the fluid's own movement through convection.

Heat causes a fluid's particles to gain energy and lose density, which causes them to rise. Heat energy is carried upward by the heated fluid.

A cycle of circulationresults from the movement of colder fluid from the surroundings into its place in the interim.

Through this mechanism, heat can be moved from hotter to cooler areas of the fluid. Convectioncurrents are frequently seen in fluids like air and liquids, and they're important for both engineering and a variety of natural occurrences.

Thus, the correct option is a.

For more details regarding Convection currents, visit:

brainly.com/question/29763773

#SPJ6

Answer:

the answer is A. convection currents

Explanation:Convection currents transfer heat from one place to another by mass motion of a fluid such as water, air or molten rock. The heat transfer function of convection currents drives the earth’s ocean currents, atmospheric weather and geology. Convection is different from conduction, which is a transfer of heat between substances in direct contact with each other.

hopes this helps yall

The function of a capacitor in an electric circuit is to A. allow current flow between its plates.
B. store electric charges.
C. increase circuit power.
D. measure the amount of current in the circuit.

Answers

Answer: B. store electric charges.

Explanation: I JUST TOOK THE PF EXAM AND I GOT IT CORRECT!!!!

A dog walks 12 meters to the west and then 16 meters back to the east

Answers

Answer:

Explanation:

4 meters east

4 meters east dude woot

when the lowest frequency above the fundamental is played, at what height will the particles' displacement be out of phase and have the same amplitude as that of the particles 8.0cm above the surface of the water? give your answer as a distance above the surface of the water.

Answers

Answer:

theg watte wil shajka

Explanation:

bshswu

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