3 years ago

What causes colour in fireworks

1 answer:

8 0

<span>Inside each handmade firework are small packets filled with special chemicals, mainly metal salts and metal oxides, which react to produce an array of colors. </span>

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tia_tia [17]

For the purpose of the exercise, we can assume that the Earth is at perihelion (closest point to the Sun) on December 21st (in reality, it happens around January 4th) and that the Earth is at aphelion (farthest point from the Sun) on June 21st (in reality, this happens around July 4th). The distance Earth-Sun is the following:
- Perihelion: 147.1 milion km
- Aphelion: 152.1 milion km
- Average distance: 149.6 milion km
So, we can calculate the percentage change with respect to the average distance as:
$d= \frac{d(aphelion)-d(perihelion)}{d(average)}\cdot 100= \frac{152.1-147.1}{149.6}\cdot 100=3.3 \%$

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the filament of an electric lamp, which draws a current of 0.5 a is used for 2 hours. calculate the amount of charge flowing thr

Anastasy [175]

Answer:

I = 0.25 AND T= 4 HOURS, Q = ??

multiply both min and sec , 240 and 60

we get 1400 sec

the formula for current is I = Q/T

substitute the given data in the formula and simplify it

so , Q = 3600C

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3 years ago

A body in uniform velocity has zero acceleration why?

NikAS [45]

When the velocity is uniform, the velocity does not change. since acceleration is the rate of change in velocity, the acceleration will be zero when velocity is uniform

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A ball is thrown upwards and returns to the same position, with negligible air resistance acting on it. Compared with its origin

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"Compared with its original speed after release, its speed when it returns to the same position is about <span>b. the same as, since gravity has now acted up on. </span>

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