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ad-work [718]
3 years ago
15

A rock of mass m is twirled on a string in a horizontal plane. The work done by the tension in the string on the rock is:

Physics
1 answer:
Varvara68 [4.7K]3 years ago
7 0

Answer: c) 0

Explanation:

Work tension is zero because in any infinitesimal time interval, the tension force is directly perpendicular to the displacement.

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Answer:

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2 years ago
A piece of wire length 30cm and cross sectional area of 0.5mm^2 has a resistance of 5ohms at 20°c. It is then heated to a temper
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Answer:

8.333*10^-6 ohms

Explanation:

Resistivity of a material is expressed as;

p = RA/l

R is the resistance of the material

A is the cross sectional area

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Given

R = 5 ohms

A = 0.5mm^2

A = 5 * 10^-7m^2

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Substitute into the formula;

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p = 25 * 10^-7/0.3

p = 0.0000025/0.3

p = 8.333*10^-6

Hence its resistivity at 20 degrees Celsius is 8.333*10^-6 ohms

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3 years ago
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