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gregori [183]
3 years ago
15

The same force is applied to two skateboards. One rolls across the room and the other moves a few feet and comes to a stop. Wher

e was there more work done? The skateboard that traveled the shorter distance shows more work because there was more resistance. The skateboard that traveled the longer distance shows more work because it was lighter. The skateboard that traveled further shows more work because the distance was greater. The skateboard that traveled the shorter distance shows more work because the force was greater.
Physics
2 answers:
igor_vitrenko [27]3 years ago
8 0

The longer you spend reading and thinking about this question,
the more defective it appears.

-- In each case, the amount of work done is determined by the strength
of the force AND by  the distance the skateboard rolls <em><u>while you're still </u></em>
<em><u>applying the force</u>.   </em>Without some more or different information, the total
distance the skateboard rolls may or may not tell how much work was done
to it.<em>
</em>
-- We know that the forces are equal, but we don't know anything about
how far each one rolled <em>while the force continued</em>.  All we know is that
one force must have been removed.

-- If one skateboard moves a few feet and comes to a stop, then you
must have stopped pushing it at some time before it stopped, otherwise
it would have kept going. 

-- How far did that one roll while you were still pushing it ?

-- Did you also stop pushing the other skateboard at some point, or
did you stick with that one?

-- Did each skateboard both roll the same distance while you continued pushing it ?

I don't think we know enough about the experimental set-up and methods
to decide which skateboard had more work done to it.

Lyrx [107]3 years ago
5 0

Answer: More Work was done by the Skateboard that traveled farther.

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What affect would using a 12V car battery have on the operation of your circuit? (Do not try this.) What would happen to the cur
k0ka [10]

Answer:

Incomplete question

This is the completed question

If the resistor in the circuit had a larger resistance then the current would be then have to be proportionally smaller. Because the batteries each give off 1.5 volts then the current would have to be the variable that would change. What affect would using a 12V car battery have on the operation of your circuit? (Do not try this.) What would happen to the current? What would happen to the resistor?

Explanation:

Using ohms law as our basis

Ohms law state that, the voltage in an ohmic conductor is directly proportional to the current

V∝I

Resistance is the constant of proportionality

Then

V=iR

Since we want a relationship between current and resistance.

then, I=V/R

So, current is inversely proportional to Resistance

as the current increase the resistance reduce and as the current reduces the resistance increases.

a. So, increasing the voltage from 1.5V to 12V increases the current In the circuit because voltage Is directly proportional to I.

From ohms law

V=iR

When v =1.5V

I=1.5/R

When V increase to 12V

I=12/R

I.e, it increases by a factor of 8. Eight times it's initial value

b. Now, the resistance in the circuit is the constant of proportionality and it doesn't change in a given circuit expect when using a variable resistoa r like rheostat.

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What is its speed after 3. 83 as if it accelerates uniformly at −3. 04 m/s 2 ? answer in units of m/s.
weeeeeb [17]

The velocity equation is v_{final} =v_{initial} +at\\

Known facts:

  • t = 3.83s
  • a= -3.04
  • intial velocity = 0

Plug into equation known quantities:

   v_{final} = (-3.04) * 3.83 = -11.6432m/s

Thus the final velocity is -11.6432m/s

Hope that helps!

6 0
3 years ago
Fill in the blanks:
oksano4ka [1.4K]
<h2>Answers:</h2>

<h2>1. event horizon </h2>

The event horizon is the surface of a black hole, it is the border of space-time in which the events on one side of it can not affect an observer on the other side.

That is, at this border also called <em>"point of no return"</em>, nothing can escape (not even light) and no event that occurs within it can be seen from outside.  

<h2>2. gravitational lensing  </h2>

According to Einstein's theory of relativity, mass causes the curvature of spacetime and this curvature is what we call <u>gravity</u>.

Then, the light always move following the curvature that gravity causes in spacetime, and in this way the rays of light are deflected if there is a mass accumulation nearby. Being this is the principle of the gravitational lensing.

<h2>3. black hole </h2>

According to Einstein's theory of relativity, inside a black hole there is a <em>"singularity"</em> that consists of a region of the space in which <u>the density of matter tends to infinity. </u>

How is it possible?

Following what relativity establishes, bodies within a gravitational field follow a curved space path. Then the more a body enters the black hole, the more curved the space will become, until, in the center, it will become infinitely curved.

<h2>4. gravitational waves </h2>

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

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>

<h2>5. wormhole</h2>

A wormhole is <u>a hypothetical feature of a space-time</u> described in the equations of general relativity, which essentially consists of a shortcut through space and time.  It is not proven that they exist, although <u>mathematically they are possible</u> .

In other words:

A wormhole is a tunnel that joins two black holes in different places (two points of spacetime).

<h2>6. time dilation (gravitational) </h2>

The dilation of time is a phenomenon that results from the theory of relativity, which states that time passes at different rates in regions of different gravitational potential.

That is, the greater the local distortion of spacetime due to gravity, the slower the time passes.

<h2>7.  gravitational redshift</h2><h2 />

When we talk about the <u>visible electromagnetic spectrum</u>, we know it starts in violet-blue and ends in red.  

Now, in this context the astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed that the spectral lines were displaced towards the red one (red shift), whereas the nearby stars showed a spectrum displaced to the blue one.  

From there, it was deduced that the farther an body in the universe is, the more redshifted it is in its spectrum.  This effect is due to the dilation and contraction of time by speed.  

7 0
3 years ago
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