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8_murik_8 [283]
3 years ago
8

Which is not an advantage that a reflector telescope has over a refractor telescope? A. Flaws and bubbles in the material inside

a thick mirror are not a problem, while flaws and bubbles in the material inside a thick lens are. B. Reflectors can be built with much bigger apertures. C. The device that collects the light is more easily supported in a reflector. D. Reflectors avoid the problem of chromatic aberration in the lens. E. A reflector doesn’t have to deal with the twinkling of the stars, as a refractor does.
Physics
1 answer:
klasskru [66]3 years ago
7 0

Answer:

Answer E is false because the two instruments see the flickering of the stars, so this is not a characteristic of a reflector

Explanation:

Let's analyze the characteristics of a reflecting telescope.

 

- use reflection to create images

- does not have the chromatic aberration problem

Let's see the responses a, b, c and d are characteristics of a refractor

Answestars, so this is not a characteristic of a reflector

Answer E is false because the two instruments see the flickering of the stars, so this is not a characteristic of a reflector

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Friction:

Friction is the resistive force that acts on the body in a direction opposite to the direction of motion of the same object.

Laws of friction:

1. The frictional force acting on the object is proportional to the normal force acting on the object.

For example, if the object of mass m is moving along the horizontal surface, the normal force acting on the object is mg.

Thus, the frictional force acting on the object is,

\begin{gathered} F_r\propto F_N \\ F_r=\mu F_N \end{gathered}

where F_N is the normal force acting on the object,

\mu\text{ is the coefficient of friction}

The diagrammatic representation of the frictional force acting on the object is,

2. The frictional force acting on the object depends upon the nature of the surface in contact with the object.

3. The frictional force does not depend upon the area of contact of an object with the surface.

4. The kinetic friction acting on the object is independent of the velocity of the object.

5. The coefficient of static friction is more than the coefficient of kinetic friction.

Two factors on which the frictional force depends are:

1. The frictional force depends on the adhesion between the two bodies in contact.

2. The frictional force acting on the depends upon the roughness of the surface on which the object is moving.

3 0
1 year ago
A certain frictionless simple pendulum having a length l and mass m swings with period t. If both l and m are doubled, what is t
iVinArrow [24]

If l and m both are doubled then the period becomes √2*T

what is a simple pendulum?

It is the one which can be considered to be a point mass suspended from a string or rod of negligible mass.

A pendulum is a weight suspended from a pivot so that it can swing freely.

Here,

A certain frictionless simple pendulum having a length l and mass m

mass of pendulum = m

length of the pendulum = l

The period of simple pendulum is:

T = 2\pi \sqrt{\frac{l}{g} }

Where k is the constant.

Now the length and mass are doubled,

m' = 2m

l' = 2l

T' = 2\pi \sqrt{\frac{2l}{g} }

T' = \sqrt{2}* 2\pi \sqrt{\frac{l}{g} }

T' = \sqrt{2} * T

Hence,

If l and m both are doubled then the period becomes √2*T

Learn more about Simple Harmonic Motion here:

<u>brainly.com/question/17315536</u>

#SPJ4

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Answer:

Superconducting materials can transport electrons with no resistance, and hence release no heat, sound, or other energy forms. Superconductivity occurs at a specific material's critical temperature (Tc). As temperature decreases, a superconducting material's resistance gradually decreases until it reaches critical temperature. At this point resistance drops off, often to zero, as shown in the graph at right.

Explanation:

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Breathing on a cold window can cause it to fog up. which change of state causes this
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I know this because I learned it in science class in school.

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