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pashok25 [27]
3 years ago
6

You are given three pieces of wire that have different shapes (dimensions). You connect each piece of wire separately to a batte

ry. The first piece has a length L and cross-sectional area A. The second is twice as long as the first, but has the same thickness. The third is the same length as the first, but has twice the cross-sectional area. Rank the wires in order of which carries the most current (has the lowest resistance) when connected to batteries with the same voltage difference.
Physics
1 answer:
Vesna [10]3 years ago
4 0

Answer:

I3 > I1 > I2

Explanation:

Length of first piece = L

Area of first piece = A

Length of second piece = 2L

Area of second piece = A

Length of third piece = L

Area of third piece = 2A

The current is maximum when the resistance is minimum.

Let ρ is the resistivity of the material of wire.

The formula for the resistance is given by

R = \rho \frac{L}{A}

Resistance of first wire

R_{1} = \rho \frac{L}{A} = R

Resistance of second wire

R_{2} = \rho \frac{2L}{A}=2R

Resistance of third wire

R_{3} = \rho \frac{L}{2A}=\frac{R}{2}

R3 < R1 < R2

I3 > I1 > I2

Thus, the current is maximum in third wire is maximum and minimum in second wire.

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A 1 900-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.00 m before coming into contact
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Answer:

471392.4 N

Explanation:

From the question,

Just before contact with the beam,

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make f the subject of the equation

F = mgh/d................ Equation 2

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A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and
garri49 [273]

Answer:

(a) t = 1.14 s

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Explanation:

(b)

Considering the upward motion, we apply the third equation of motion:

2gh = v_f^2 - v_i^2

where,

g = - 9.8 m/s² (-ve sign for upward motion)

h = max height reached = ?

vf = final speed = 0 m/s

vi = initial speed = 4 m/s

Therefore,

(2)(9.8\ m/s^2)h = (0\ m/s)^2-(4\ m/s)^2\\

<u>h = 0.82 m</u>

Now, for the time in air during upward motion we use first equation of motion:

v_f = v_i + gt_1\\0\ m/s = 4\ m/s + (-9.8\ m/s^2)t_1\\t_1 = 0.41\ s

(c)

Now we will consider the downward motion and use the third equation of motion:

2gh = v_f^2-v_i^2

where,

h = total height = 0.82 m + 1.8 m = 2.62 m

vi = initial speed = 0 m/s

g = 9.8 m/s²

vf = final speed = ?

Therefore,

2(9.8\ m/s^2)(2.62\ m) = v_f^2 - (0\ m/s)^2\\

<u>vf = 7.17 m/s</u>

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v_f = v_i + gt_1\\7.17\ m/s = 0\ m/s + (9.8\ m/s^2)t_2\\t_2 = 0.73\ s

(a)

Total Time of Flight = t = t₁ + t₂

t = 0.41 s + 0.73 s

<u>t = 1.14 s</u>

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