Sound waves travel faster in: a. solids as compared to liquids. b. liquids as compared to gases. c. warm air as compared to cooler air. d. All of the above are correct.

Answers

Answer 1

Answer:

Answer:

d all of the above are correct

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A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high. How far from the base of the cliff does the stone strike the ground?

The calcium carbonate found in limestone was originally extracted from _______.a. seawater
b. shale
c. magma
d. silt

Answers

The correct answer is a:Seawater

Answer:

the answer b

Explanation:

PLX HELPAll elements in the same group
A) have similar chemical properties.
B) are not similar in any way.
C) are in the same state at room temperature.
D) have the same boiling and freezing points.

Answers

The answer to this question is A.

Answer: THE ANSWER IS A!!

Explanation:

Which of the following is a form of mechanical energy?a. internal energy
c. gravitational potential energy
b. chemical potential energy
d. electrical energy

Answers

Gravitational potential energy is a form of mechanical energy.

What is Gravitational potential energy?

Gravitational potential energy is the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field.

If an object is at rest and doesn't involve elastic energy, then mechanicalenergy can be equal to gravitational potential energy.

To learn more about Gravitational potential energy here

brainly.com/question/3884855

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Okay so i believe that potential energy is mechanical but there are two answers with potential energy in it. Its a tough one but I think I would go with gravitational potential energy. Hope this helped!

Suppose your rub a balloon in your hair and it acquires a static charge of −2 × 10⁻⁹c. what is the magnitude of the electric field created by the balloon at a location 1 m due north of the balloon? Coulomb’s constant is 9 × 10⁹ N · m²/c² . Answer in units of N/C

Answers

To find the magnitude of the electric field created by the balloon at a location 1 m due north of the balloon, we can use Coulomb's law. Coulomb's law states that the electric field (E) created by a point charge is given by the equation E = k * (Q / r^2), where k is Coulomb's constant, Q is the charge, and r is the distance from the charge.

Given that the charge of the balloon is -2 × 10^(-9) C and the distance from the balloon is 1 m, we can substitute these values into the equation:

E = (9 × 10^9 N · m²/C²) * (-2 × 10^(-9) C) / (1 m)^2

Note that the negative sign indicates the direction of the electric field, which in this case is due north.

E ≈ -18 N/C

Therefore, the magnitude of the electric field created by the balloon at a location 1 m due north of the balloon is approximately 18 N/C.

Why does a hot air balloon float?The shape of the balloon prides lift.
The volume of the air displaced by the balloon is less than the volume of the balloon
The weight of the air displaced is less than the volume of the balloon
The weight of the balloon is less than the weight of the air displaced by the balloon

Answers

The most accurate answer among the choices would be the fourth one, because if the weight of the air displaced is greater than the balloon's weight, the balloon will float upwards. Density of the air also plays a part. Hot air = less dense. Hope my answer has come to your help.

Right answer: The weight of the air displaced is less than the volume of the balloon

A hot air balloon is a cloth wrap that contains several thousand cubic meters of air inside (a large volume of air). The burner (which is the motor of the balloon and responsible for its elevation) heats the liquid propane to a gaseous state to generate a huge flame, thus heating the air mass inside the balloon. In this way, its density is modified with respect to the air that surrounds it, because the hot air is lighter than the outside air (less dense), causing the balloon to rise and float.

Now, if we know that the density of a body $d$ is directly proportional to its mass $m$ and inversely proportional to its volume $V$ :

$d=(m)/(V)$

We can deduce that

by increasing the volume of the body, its density will decrease.

This is proof of Archimedes' Principle:

A body totally or partially immersed in a fluid at rest, experiences a vertical upward thrust equal to the mass weight of the body volume that is displaced.

In this case the fluid is the air outside. So, the warm air inside the balloon, being less dense, will weigh less than the outside air and therefore will receive an upward pushing force or thrust that will make the balloon ascend.

During a phase change what happens to the temperature?

Answers

During a phase change the substance or objects temperature increases or decreases depending on which way they go, Solid to liquid to gas needs added heat which makes it an endothermic reaction. Gas to liquid to solid loses heat energy to slow down its particles this is an exothermic reaction.

The temperature either rises or falls during a state change.
Ex.
Melting from ice to water~ the temperature is rising.

OR

Ex.
From a gas to a liquid~ the temperature is falling.

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