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3 years ago

PHYSICS! I AM TIMED!

Physics

2 answers:

Lana71 [14]3 years ago

8 0

28J because mechanical energy is the sum of the potential energy and kinetic energy

ludmilkaskok [199]3 years ago

3 0

Answer:

28 J, because mechanical energy is the sum of the potential energy and kinetic energy .

Explanation:

Mechanical energy is the combination of the kinetic and potential energy.

Kinetic energy is the energy that an object will have due to its motion.

Whenever an object's state or position is considered, it is called potential energy. For example, a bird sitting on top of a tree at some height is said to possess potential energy.

Whenever an object has velocity, it will have kinetic energy.

It is maximum when the potential energy is a minimum or zero, when total energy of an object or a system is conserved.

Similarly, whenever an object or a system has maximum potential energy, its kinetic energy is a minimum or zero.

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Sharp claws in wild animals is an example of which type of adaptation?

Sati [7]

Answer:

Structural adaptation

Explanation:

When any physical body part of an organism helps it in surviving, then this mechanism of survival is called a structural adaptation. For example short tail of penguins helps them in balancing on their heels and tails due to which they are able to reduce heat released from their feet. Thus, any physical parts of an organism that helps them in coping with the surrounding physical environment /predators are refereed to as a mode of structural adaptation.

3 0

3 years ago

By what factor must the amplitude of a sound wave be decreased in order to decrease the intensity by a factor of 3?

s344n2d4d5 [400]

Answer:

Amplitude is decreased by a factor of $\sqrt3$ if intensity is decreased by a factor of 3.

Explanation:

Intensity of a sound wave is directly proportional to the square of its amplitude.

Therefore, if intensity is $I$ and amplitude is $A$ , then

$I=kA^2$ , where, $k$ is constant of proportionality.

Now, if intensity of sound wave is decreased by a factor of 3. So,

New intensity is, $I_{new}=\frac{I}{3}$

$I_{new}=kA_{new}^2\\\frac{I}{3}=kA_{new}^2$

Plug in $kA^2$ for $I$ . This gives,

$\frac{kA^2}{3}=kA_{new}^2\\A_{new}^2=\frac{A^2}{3}\\A_{new}=\sqrt{\frac{A^2}{3}}=\frac{A}{\sqrt{3}}$

Therefore, amplitude is decreased by a factor of $\sqrt3$ .

4 0

3 years ago

Which best symbolizes the hydrogen bonding between two water molecules?

Artemon [7]

The best symbolizes the hydrogen bonding between two water molecules is given in the diagram.

<h3 /><h3>What is hydrogen bonding?</h3>

A hydrogen bond is an attraction between an electronegative atom carrying a single pair of electrons—the hydrogen bond acceptor—and a hydrogen atom that is covalently bonded to a more electronegative "donor" atom or group.

One definition of a polar covalent bond is one in which one atom has a stronger alternation for electron negativity difference between two bonds, the more polar the link.

Polar molecules like H2O have a mild partial negative charge in one area and a partial positive charge in another.

to learn more about hydrogen bond go to -

brainly.com/question/1426421

#SPJ4

4 0

2 years ago

Which method of heat transfer takes place when particles of matter vibrate and collide with each other in direct contact

Cerrena [4.2K]

Conduction, hope this helps! :)

6 0

3 years ago

Read 2 more answers

Based on the diagram of the two electrical circuits, assuming the lightbulbs are all identical, which circuit will draw more pow

pochemuha

In series connection in orde to find the total resistance we add all the resistance capacity but in parallel, we take the 1/R and resistance = V hence the series connection takes up more power,

8 0

3 years ago