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evablogger [386]
2 years ago
11

A 1.5kw vacuum cleaner is used for half an hour. Calculate its energy usage.​

Physics
1 answer:
juin [17]2 years ago
8 0

Answer:

its energy usage is 0.05

Explanation:

1.5kw/30=0.05

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Based on the type of medium, what can you assume about the speed of sound in glass?
adelina 88 [10]

Answer:

"It will be more than the speed of sound waves in air at 20*C and water at 20*C."

Explanation:

Speed of sound in a medium depends upon the density and elasticity of the medium.

If the elasticity of a medium is greater and the density of that medium is lower, sound will travel faster. Although density is also a factor but the major factor is Elasticity.

Hence, sound travel faster in solids than in liquids and even slower in gases due to elasticity difference.

                        Speed of sound = V = \sqrt{\frac{Elasticity}{Density} }

That is why the speed of sound in glass will be more than the speed of sound waves in air at 20*C and water at 20*C.

5 0
3 years ago
You accidentally drop a book out of the window of a tall building. Assuming
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Answer:

very fast

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Green light (520 nm) enters glass with n = 1.52. What is speed of light in the glass?​
Lorico [155]

Answer:

Explanation:

v=\frac{c}{n}

=\frac{3.00*10x^{8} }{1.52}

answer=1.97×10^8

5 0
3 years ago
Describe the relationship between joules, meters, and newtons
Naily [24]
Newton is a unit of force. Joules is an amount of work which is equal to the force times distance, or newton meters. So the product of newtons and meters makes joules.
5 0
3 years ago
the universal law of gravitation states that the force of attraction between two objects depends on witch quantities?​
Temka [501]

The equation is Fg = G(m₁m₂/d²).

G is the universal gravitational constant, but that isn't exactly a quantity.

m₁ and m₂ are the masses of the two objects, and those are quantities.

d is the distance between the two objects, and those are quantities.

So, masses and distance.

6 0
3 years ago
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