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DENIUS [597]
4 years ago
14

2 examples of friction good and bad

Physics
1 answer:
liubo4ka [24]4 years ago
7 0
<span>✡ Answers:
Good
- </span><span>The reason that people and animals can walk. Because of friction we are able to walk one foot to the other.
- Prevents accidents, like being able to slam on a cars break and sliding endlessly.

Bad:
- When trying to go faster, friction can prevent that. In a car, or even trying to roller skate.
- It will damage the object that is sliding. Weather its skinning your knee of busting a tire. </span><span><span>✡</span>

</span>
✡Hope this helps<span>✡

</span>





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Which of the following accurately describe some aspect of gravitational waves? Select all that apply.
steposvetlana [31]
<h2>Answers:</h2>

-The first direct detection of gravitational waves came in 2015

-The existence of gravitational waves is predicted by Einstein's general theory of relativity

-Gravitational waves carry energy away from their sources of emission

<h2>Explanation:</h2>

Gravitational waves were discovered (theoretically) by Albert Einstein in 1916 and "observed" for the first time in direct form in 2015 (although the results were published in 2016).  

These gravitational waves are fluctuations or disturbances of space-time produced by a massive accelerated body, modifying the distances and the dimensions of objects in an imperceptible way.  

In this context, an excellent example is the system of two neutron stars that orbit high speeds, producing a deformation that propagates like a wave,<u> in the same way as when a stone is thrown into the water</u>. So, in this sense, gravitational waves carry energy away from their sources .

Therefore, the correct options are D, E and F.

5 0
4 years ago
The pressure at the bottom of a cylindrical container with a cross-sectional area of 45.5 cm2 and holding a fluid of density 420
iris [78.8K]

Answer:

3.33 m

Explanation:

Pressure is the distributed force applied to the surface of an object per unit area. The force is applied perpendicular to the surface of the object. The SI unit of pressure is N/m² or Pa.

Hydrostatic pressure is the pressure that a fluid exerts at a point due to the force of gravity.

The relationship between  pressure on the bottom of the container,  atmospheric pressure and the pressure due to the depth of the fluid is given by:

P_{bottom}-P_{atm}=P_{depth}\\\\where\ P_{bottom}=pressure\ at\ the \ fluid\ bottom,\ P_{atm}=atmospheric\ pressure\\P_{depth}=pressure\ due\ to\ fluid\ depth=\rho gh. \ Hence:\\\\P_{bottom}-P_{atm}=\rho gh\\\\Given \ that\ P_{bottom}=115\ kPa=115*10^3\ Pa, let\ us\ assume\ P_{atm}=101\ kPa=101*10^3\ Pa,\rho=420\ kg/m^3,g=acceleration\ due\ to \ gravity=10\ m/s^2.\\\\Therefore:\\\\115*10^3-101*10^3=420*10*h\\\\14*10^3=4200h\\\\h=3.33\ m\\\\

6 0
3 years ago
A 1500kg car is travelling at v=30m/s. The cars kinetic energy is? *
Anuta_ua [19.1K]

Hi there!

\large\boxed{\text{D. 675000J}}

Use the following formula to solve:

KE = 1/2mv², where:

KE = kinetic energy

m = mass (kg)

v = velocity (m/s)

Therefore:

KE = 1/2(1500)(30)²

KE = 1/2(1500)(900)

KE = 675000 J

4 0
3 years ago
What is the term for an electrical channel within the circuitry of a computer than can transfer 8 bytes of data at a time?
Leokris [45]
The term for an electrical channel within the circuitry of a computer that can transfer 8 bytes of data at a time is called Bus. It <span>allows the devices both inside and attached to the system unit to communicate with each other. I hope this answer helps. Have a great day.</span>
4 0
3 years ago
Two parallel plates have an area of
Murrr4er [49]

Answer:

8.85

Explanation:

The computation of the charge that must place on them in order to create 1000 N/C field between the plates is shown below:

We know that

E = (Q/A) ÷ E_o

1000 = Q ÷ 0.01×8.85× 10^-12

Q = 8.85 × 10^-12

So,

The answer is 8.85

The above formula should be applied so that the correct value could come

And, the same would be relevant

3 0
3 years ago
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