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3 years ago

The idea that earth was the center of the universe is an example of ___ that has long been discarded

Physics

2 answers:

anyanavicka [17]3 years ago

5 0

hypothosis is your answer hop it helps you out

aleksandrvk [35]3 years ago

4 0

Hello. The answer to your question is ''<span>hypothesis''. I hope this helps! </span>

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A water wave has a frequency of 460 Hz and a wavelength of 18 meters. What is the speed of the wave?

Lunna [17]

solution;

given

speed of wave= frequency×wavelength

=460×18

= 8280m/s

Explanation:

<h2>first of all given should be written & by using the formula of speed of sound .</h2>

3 0

2 years ago

Two children are riding on the edge of a merry-go-round that has a mass of 100.kg and radius of 1.60m and is rotating at 20.0rpm

Gre4nikov [31]

Here since both children and merry go round is our system and there is no torque acting on this system

So we will use angular momentum conservation in this

$I_1\omega_1 = I_2\omega_2$

now here we have

$I_1 = \frac{MR^2}{2} + m_1R^2 + m_2R^2$

$I_1 = \frac{100(1.60)^2}{2} + (22 + 28)(1.60)^2$

$I_1 = 256$

Now when children come to the position of half radius

then we will have

$I_2 = \frac{MR^2}{2} + m_1(\frac{R}{2})^2 + m_2(\frac{R}{2})^2$

$I_2 = \frac{100(1.6)^2}{2} + (28 + 22)(0.8)^2$

$I_2 = 160$

now from above equation we have

$256 (20.0 rpm) = 160(\omega_2)$

$\omega_2 = 32 rpm$

8 0

3 years ago

A frame hanging on a wall is held by two cables. The tension in each cable is 30 N, and the cables make an angle of 45° with the

Vesna [10]

Answer:

(D) 42.4N

Explanation:

Since the frame is at rest, the net force acting on it must be 0. There are three forces acting on it: the gravity and the opposing forces of the two cables.

Since the gravity is a vertical force, we are only interested in the vertical components of the remaining forces. The net force equation is

F_net = 0 = F_g -2 * F_y

The vertical force of one cable (using the information in the drawing) is:

F_y = 30N * sin 45 deg = 21.21N

Now the weight can be determined:

0 = F_g - 2 * F_y

F_g= 2 * F_y = 2 * 21.21N = 42.4N

The weight of the frame is about 42.4N.

6 0

3 years ago

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Please help<br> list real-world examples of the different types of stimuli

ra1l [238]

Answer:

You are hungry so you eat some food.

A rabbit gets scared so it runs away.

You are cold so you put on a jacket.

A dog is hot so lies in the shade.

It starts raining so you take out an umbrella.

6 0

2 years ago

Laws of rotation of light

Rudiy27

Answer:

H2CO3

Explanation:

THATS CORRECT DONT WORRY

5 0

3 years ago

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