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3 years ago

List the properties of the following fibres: a. cotton b. jute c. synthetic fibres

Physics

1 answer:

disa [49]3 years ago

6 0

cotton - moderately strong fibre

easy to handle and sew

comfortable soft hand

jute - bio-degradable

strong

organic

synthetic fibre -action of water

electric conductivity

thermal conductivity

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3 years ago

A person hits a tennis ball with a mass of 0.058 kg against a wall.

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Explanation:

Mass of the ball, m = 0.058 kg

Initial speed of the ball, u = 11 m/s

Final speed of the ball, v = -11 m/s (negative as it rebounds)

Time, t = 2.1 s

(a) Let F is the average force exerted on the wall. It is given by :

$F=\dfrac{m(v-u)}{t}$

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(b) Area of wall, $A=3\ m^2$

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P = 0.202 Pa

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3 years ago

A department store sells an ""astronomical telescope"" with an objective lens of 30 cm focal length and an eyepiece lens of foca

Yuliya22 [10]

Answer:

The magnifying power of this telescope is (-60).

Explanation:

Given that,

The focal length of the objective lens of an astronomical telescope, $f_o=30\ cm$

The focal length of the eyepiece lens of an astronomical telescope, $f_e=5\ mm=0.5\ cm$

To find,

The magnifying power of this telescope.

Solution,

The ratio of focal length of the objective lens to the focal length of the eyepiece lens is called magnifying of the lens. It is given by :

$m=\dfrac{-f_o}{f_e}$

$m=\dfrac{-30}{0.5}$

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3 years ago

List the properties of the following fibres: a. cotton b. jute c. synthetic fibres ​

List the properties of the following fibres: a. cotton b. jute c. synthetic fibres