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cricket20 [7]
1 year ago
9

An energy source will supply a constant current into the load if its internal resistance is.

Physics
1 answer:
Illusion [34]1 year ago
4 0

Answer:

If its internal resistance is zero or remains constant.

Explanation:

  • Considering the attached figure it is possible to be written an expression for the current that flows through the load connected to a source of voltage as follows.

                                                 \begin{aligned}\ \small i&=\small \frac{E}{R+r}\end{aligned}

  • Here, E,\,R,\,r represent the voltage of the energy source, the load resistance and the internal resistance of the source respectively
  • The denominator of the fraction is subject to change due to r being the possible parameter that is variable.
  • Therefore, the current can be fixed at \bold{r =0} or \bold{r = k}, k = constant.
  • In such a case the current would appear to be in either form as follows,

                                \begin{aligned}i = \frac{V}{R} \qqud \qquad \text{or}\qquad i = \frac{V}{R+k}\end{aligned}

  • Once either of the above condition is held the current  = constant.

#SPJ4

                                                 

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Which scientist first proposed physical laws to mathematically describe the effect of forces on the motions of bodies?
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Answer:

Sir Issac Newton

Explanation:

These are the effects of gravity.

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If the mass of the ladder is 12.0 kgkg, the mass of the painter is 55.0 kgkg, and the ladder begins to slip at its base when her
Marysya12 [62]

Answer:

 μ = 0.336

Explanation:

We will work on this exercise with the expressions of transactional and rotational equilibrium.

Let's start with rotational balance, for this we set a reference system at the top of the ladder, where it touches the wall and we will assign as positive the anti-clockwise direction of rotation

          fr L sin θ - W L / 2 cos θ - W_painter 0.3 L cos θ  = 0

          fr sin θ  - cos θ  (W / 2 + 0,3 W_painter) = 0

          fr = cotan θ  (W / 2 + 0,3 W_painter)

Now let's write the equilibrium translation equation

     

X axis

        F1 - fr = 0

        F1 = fr

the friction force has the expression

       fr = μ N

Y Axis

       N - W - W_painter = 0

       N = W + W_painter

       

we substitute

      fr = μ (W + W_painter)

we substitute in the endowment equilibrium equation

     μ (W + W_painter) = cotan θ  (W / 2 + 0,3 W_painter)

      μ = cotan θ (W / 2 + 0,3 W_painter) / (W + W_painter)

we substitute the values ​​they give

      μ = cotan θ  (12/2 + 0.3 55) / (12 + 55)

      μ = cotan θ  (22.5 / 67)

      μ = cotan tea (0.336)

To finish the problem, we must indicate the angle of the staircase or catcher data to find the angle, if we assume that the angle is tea = 45

       cotan 45 = 1 / tan 45 = 1

the result is

    μ = 0.336

5 0
3 years ago
Which has the greater acceleration, a person going from 0 m/s to 10 m/s in 10 seconds or an ant going from 0 m/s to 0.25 m/s in
monitta

<u>P</u><u>e</u><u>r</u><u>s</u><u>o</u><u>n</u><u>-</u><u>1</u>

  • Initial velocity=u=0m/s
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\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}

\\ \sf\longmapsto Acceleration=\dfrac{10-0}{10}

\\ \sf\longmapsto Acceleration=\dfrac{10}{10}

\\ \sf\longmapsto Acceleration=1m/s^2

<u>P</u><u>e</u><u>r</u><u>s</u><u>o</u><u>n</u><u>-</u><u>2</u>

  • initial velocity=0m/s=u
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use first equation of motion

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For electron:

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