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Bumek [7]
3 years ago
14

Resistance and resistivity are related by a:

Physics
1 answer:
kondor19780726 [428]3 years ago
4 0

Answer: D

Explanation: Resistance of current in a wire is directly proportional to the length of the wire and inversely proportional to the cross - sectional area of the wire. That is,

R = (rho × L)/A

Where

L = length of the wire

A = cross sectional Area of the wire

rho = resistivity = proportionality constant which depends on the quality of the wire.

Therefore, Resistance and resistivity are related by a:

proportionality constant dependent on the identity of the material.

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An object moves on a trajectory given by Bold r left parenthesis t right parenthesis equals left angle 10 cosine 6 t comma 10 si
spayn [35]

Answer:

10

Explanation:

(r) = <10 cos 6t, 10 Sin 6t>

The distance traveled by the object is the magnitude of vector r.

The magnitude of vector r is given by

r = \sqrt{(10 Cos 6t)^{2}+(10 Sin 6t)^{2}}

r =10 \sqrt{(Cos^{2} 6t)+(Sin^{2} 6t)

r = 10        

5 0
3 years ago
A passenger on an interplanetary express bus traveling at = 0.95 takes a 9.0-minute catnap, according to her watch.How long does
Nimfa-mama [501]

Answer:

28.82 minutes

Explanation:

This problem is an example of time dilatation by acceleration. The formula is:

\Delta t=\gamma \Delta t_0=\frac{\Delta t_0}{\sqrt{1-\frac{v^2}{c^2} }}

\Delta t is the time measured by the observer on a fixed position (in this case in the fixed planet), \Delta t_0 is the time measured by the person moving away from the fixed observer (the one on an interplanetary express bus), c is the speed of light and v the velocity of the observer that is moving away (the velocity of the ship).

\Delta t_0=9 min=540s\\\Delta t=\frac{540}{\sqrt{1-\frac{(0.95c)^2}{c^2}}}=\frac{540}{\sqrt{1-\frac{0.95^2c^2}{c^2}}}=\frac{540}{\sqrt{1-0.95^2}}\\\Delta t=\frac{540}{\sqrt{1-0.9025}}=\frac{540}{\sqrt{0.0975}}=\frac{540}{0.3122}=1729.38s\\\Delta t=28.82minutes

6 0
4 years ago
I have no idea what I'm doin ​
AveGali [126]

Answer:

yes  I feel you-

Explanation:

4 0
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liraira [26]

Explanation:

τ = Fr

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zvonat [6]

Answer:

dry air is way heaver

Explanation:

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