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Margarita [4]
2 years ago
9

"A comet is not actually a star". Give two reasons in favour of this statement.​

Physics
2 answers:
SVETLANKA909090 [29]2 years ago
6 0
The answer will be a cookie and a dog hhthrhrhrhdhyxyxyxyx
Tresset [83]2 years ago
5 0

Answer:

1 it doesn't have its own light

2 comet revolves around the sun and stars don't

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An circuit has a section AB as shown in the fig. with E= 10V. (sf C_1) = 1.0 F, (sf C_2) = 2.0 F and the potential difference (s
bagirrra123 [75]

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The probability of getting any kind of answer from anybody who hasn't
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4 0
3 years ago
Explain why a crack in glass looks brighter than the rest of the glass
m_a_m_a [10]

Answer:

Because nothing is blocking the LIGHT!

Explanation:

Light may still be shining on the whole glass but if it wasn't there light would shine brighter than if it was there.

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3 years ago
What is the first step in the event of a fire in a building?
yuradex [85]
I’m assuming D because it’s the most reasonable
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3 years ago
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)If a force of 5.00 N is needed to open a 90.0 cm wide door when applied at the edge opposite the hinges, what force must be app
masha68 [24]

Answer:

A force of 12.857 newtons must be applied to open the door.

Explanation:

In this case, a force is exerted on the door, a moment is performed and the door is opened. If moment remains constant, the force is inversely proportional to distance respect to axis of rotation passing through hinges. That is:

F \propto \frac{1}{r}

F = \frac{k}{r} (Eq. 1)

Where:

F - Force, measured in newtons.

k - Proportionality ratio, measured in newton-meters.

r - Distance respect to axis of rotation passing through hinges, measured in meters.

From (Eq. 1) we get the following relationship and clear the final force within:

F_{A}\cdot r_{A} = F_{B}\cdot r_{B}

F_{B}=\left(\frac{r_{A}}{r_{B}} \right)\cdot F_{A}(Eq. 2)

Where:

F_{A}, F_{B} - Initial and final forces, measured in newtons.

r_{A}, r_{B} - Initial and final distances, measured in meters.

If we know that F_{A} = 5\,N, r_{A} = 0.9\,m and r_{B} = 0.35\,m, then final force is:

F_{B}= \left(\frac{0.9\,m}{0.35\,m} \right)\cdot (5\,N)

F_{B} = 12.857\,N

A force of 12.857 newtons must be applied to open the door.

3 0
2 years ago
What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s?
gayaneshka [121]

Answer:

9.8kW

Explanation:

Given data

Mass= 60kg

Hieght= 4m

Time= 4.2seconds

We know that the energy possessed is given as

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PE= 2354.4 Joulse

Also, the expression for power is

Power=Energy*Time

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Power=9888.48 watt

Power= 9.8kW

4 0
3 years ago
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