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Alekssandra [29.7K]
3 years ago
15

Resistance and resistivity are related by a:

Physics
1 answer:
Dimas [21]3 years ago
7 0

Answer:

<u>At a given temperature</u>

Resistivity depends only on the material and resistance depends on resisitvity, length of the wire and cross-sectional area of the wire

Explanation:

At a given temperature the resistance of a specimen with unit length and unit cross sectional area is called resisitivity.

We get

        R = ρl/A

where; R = resistance

            ρ = resistivity

            l = length of the wire

            A = cross-sectional area of the wire

So you get, ρ ∝ 1\l

                   ρ ∝ A

                   ρ ∝ R

                   

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Select the situation for which the torque is the smallest.
alina1380 [7]

Answer:

e. The torque is the same for all cases.

Explanation:

The formula for torque is:

τ = Fr

where,

τ = Torque

F = Force = Weight (in this case) = mg

r = perpendicular distance between force an axis of rotation

Therefore,

τ = mgr

a)

Here,

m = 200 kg

r = 2.5 m

Therefore,

τ = (200 kg)(9.8 m/s²)(2.5 m)

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<u></u>

b)

Here,

m = 20 kg

r = 25 m

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τ = (20 kg)(9.8 m/s²)(25 m)

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c)

Here,

m = 8 kg

r = 62.5 m

Therefore,

τ = (8 kg)(9.8 m/s²)(62.5 m)

<u>τ = 4900 N.m</u>

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Hence, the correct answer will be:

<u>e. The torque is the same for all cases.</u>

6 0
3 years ago
what happens to the gravitational force when the distance between them stays the same and the mass of both objects is doubled
Dimas [21]

Answer:

The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.

Explanation:

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Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. The re
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What is the dimensional formula of torque and force ​
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✿━━━━@♥ℳg━━━━✿

<h2>\boxed{Explained\:Answer}</h2>

______________________________

✿━━━━@♥ℳg━━━━✿

Torque = Force X Displacement

= MLT-2 X L = [M1L2T-2]

The dimensional formula of force is MLT^-2

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3 years ago
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The answer to the question is:

75m/s

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