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3 years ago

Explain why is dressing table mirror may become dirsty if wiped with a cloth on a warm day.

Physics

1 answer:

gogolik [260]3 years ago

6 0

<h2>Answer:</h2>

<em>When you rub a dry cloth across glass, it creates charged static electricity, which attracts little non-charged dust particles.</em>

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Identify whether the following statements describe a change in acceleration. Explain your response

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Answer: The answer will be A

Explanation:

There is acceleration in all cases velocity changes. In options b and c the speed is constant, then there is no acceleration. In option a, the car was moving and then stop, therefore, its speed decrease to zero, and that represent an acceleration.

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3 years ago

Two sound waves of the same frequency and amplitude are broadcast from speakers at opposite ends of a theater. In the middle of

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The last one is true.
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3 years ago

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3 years ago

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3 years ago

A cart, which has a mass of m - 2.50 kg, is sitting at the top of an inclined plane which is 3.30 meters long and which meets th

SashulF [63]

Answer:

Part(i) the time taken for this cart to reach the bottom of the inclined plane is 1.457 s

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane is 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane is 25.663 J

Explanation:

Given;

mass of the cart = 2.5 kg

angle of inclination, β = 18.5⁰

length of inclined plane = 3.3m

Part(i) the time taken for this cart to reach the bottom of the inclined plane

s = ut + ¹/₂×at²

initial vertical velocity, u = 0

s = 3.3 m

s = ¹/₂×at²

$t = \sqrt{\frac{2s}{a} }$

acceleration, of the cart, a = gsinβ

a = 9.8sin(18.5) = 3.11 m/s²

$t = \sqrt{\frac{2X3.3}{3.11 }}= 1.457 s$

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane

V = a×t

V = 3.11 × 1.457 = 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane

KE = ¹/₂MV²

= ¹/₂ × 2.5× (4.531)²

= 25.663 J

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4 years ago

Explain why is dressing table mirror may become dirsty if wiped with a cloth on a warm day.​

Explain why is dressing table mirror may become dirsty if wiped with a cloth on a warm day.