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3 years ago

Reflecting telescopes are popular because they're blank than a regarding telescope

1 answer:

3 0

Reflecting telescopes are popular because they are more durable than a refracting telescopes.
There is a difference between these two types of telescopes, reflecting telescopes worked by reflecting light, they are also known as reflector and refracting telescopes worked by refracting light and they are also known as reflactor.
Reflecting telescopes also provides a good focus.

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A concave lens has a focal length of -31 {cm}. Find the image distance and magnification that results when an object is placed 2

kolezko [41]

Answer:

The value is $v = 440 \ cm$

and

$m = 16$

Explanation:

From the question we are told that

The image distance is $v = 29 \ cm$

The focal length is $f = -31 \ cm$

From the lens equation we have that

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$

=> $\frac{1}{-31} = \frac{1}{v} - \frac{1}{29}$

=> $v = 450 \ cm$

Generally the magnification is

$m = \frac{v}{u}$

=> $m = \frac{ 450}{29}$

=> $m = 16$

7 0

3 years ago

A 3.0-kg block being pulled across a table by a horizontal

zlopas [31]

Acceleration = 75/3 = 25 m/s^2

6 0

3 years ago

Jeff, a snowboarder who weighs 1000 N, is practicing on a trampoline for an upcoming competition. As Jeff bounces straight up of

NISA [10]

Answer:

Potential energy $P_E = 2000 J$

Explanation:

Given data

Weight of the person = 1000 N

Mass of the person = $\frac{1000}{9.81} = 102 kg$

Speed = 6.26 $\frac{m}{s}$

Kinetic energy is given by

$E_K = \frac{1}{2} m v^{2}$

Put the values in above formula we get

$E_K = \frac{1}{2}(102) 6.26^{2}$

$E_K = 2000 J$

When the person reach top point then at this point the velocity is zero & kinetic energy at top point is equals to the potential energy.

Therefore potential energy

$P_E = 2000 J$

5 0

3 years ago

Yung hangs a mass from a rod, sets the pendulum in simple harmonic motion, and determines the period of the pendulum. How could

yanalaym [24]

He could use a shorter rod.

8 0

4 years ago

As matter changes state from gas to liquid, which of these statements is true?

alina1380 [7]

<h3><u>Answer;</u></h3>

<em>B) The particles slow down.</em>

<h3><u>Explanation;</u></h3>

Matter is anything that occupies space and has weight. It is classified into three states namely; <em><u>liquid, solid and gases.</u></em>
<u><em>Gaseous states have particles that are far apart from each other thus they move faster with few collisions in the container they are contained.</em></u> Liquid particles on the other hand are partially apart from each other as compared to solids and gases, therefore the movement of particles is slower and the collisions are more than in the case of gases.
Therefore,<u><em> when gases are converted to liquids, it means they will become closer to each other and thus the vibrations will increase and the movement of these particles will also be slower than in the gaseous form.</em></u>

4 0

4 years ago

Read 2 more answers