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meriva
3 years ago
6

Which elements are halogens?

Physics
1 answer:
kap26 [50]3 years ago
8 0

Elements of Group 17 are halogens.

Fluorine, Chlorine, Bromine, Iodine, Astatine

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What is physical quantity ? Give examples.​
Dahasolnce [82]

Explanation:

physical quantity is any physical property that can be qualified that,is, be measured using numbers e.g mass, amount of substance,time and length

7 0
3 years ago
A ball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and pa
VLD [36.1K]

The ball takes 0.2 sec to travel the height of the window, which is 2 m.

 Then the speed of the ball at that time was

v = \frac{d}{t}

v = \frac{2}{0.20}

v = 10\ \frac{m}{s}

We know that:

v = v_0 -gt

Where v_0 is the initial velocity.

So:

10 = v_0 -9.8(2)

10 + 9.8(2) = v_0

v_0 = 29.6\ m / s

Then we have the equation for the position as a function of time.

r = r_0 + v_0t - \frac{1}{2}gt^2

Where

r_0 = initial position

r = position as a function of time

v_0 = initial velocity

g = acceleration of gravity

t = time.

If the ball is thrown from the ground then:

r_0 = 0 m

We want to find now the distance between the window and the ground.

When the ball reaches the bottom of the window t = 1.8s

So:

r = 0 + 29.6(1.8) - 0.5(9.8)(1.8)^2

r = 37,404 m

The window is 37,404 m high

Finally, to know how high the ball rises we must know at what moment the vertical velocity of the ball is zero.

v = v_0 -gt\\\\0 = v_0 -gt\\\\gt = v_0\\\\t = \frac{29.6}{9.8}

t = 3.02\ s

Now we replace t in the position equation

r = 0 + 29.6(3.02) -0.5(9.8)(3.02)^2

r = 44.70\ m

The ball reaches up to 44.70 m in height.

3 0
3 years ago
Visible light is responsible for its color?
Gekata [30.6K]

Answer:

The colour of visible light depends on its wavelength. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end. Visible light waves are the only electromagnetic waves we can

Explanation:

5 0
3 years ago
Short essay Question
Reptile [31]
<h2>Hello! :)</h2>

Answer:

In wind turbines, the blades rotate due to the wind.

Explanation:

In wind turbines, the blades rotate due to the wind.<u> While the blade rotates the generator connected to it also rotates.</u> Thus the <u>kinetic energy from the wind initiates the electric generator which in turn produces the electricity.</u>

Thus the<u> kinetic energy of the wind is converted to electricity.</u>

<u></u>

Hope this helps!

Have a Wonderful Friday!

-Good Luck on your Homework- :)

6 0
2 years ago
Read 2 more answers
Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415
motikmotik

Answer:

35 N to the right.

Explanation:

450 is going to the right so you subtract what is going against it. Which gives you 35. And because 450 is bigger than 415, it'll be going to the right.

6 0
3 years ago
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