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drek231 [11]
3 years ago
15

If the angular magnification of an astronomical telescope is 42 and the diameter of the objective is 72 mm, what is the minimum

diameter of the eyepiece required to collect all the light entering the objective from a distant point source located on the telescope axis?
Physics
1 answer:
andriy [413]3 years ago
4 0

Answer:

Minimum diameter=1.714

Explanation:

Angular magnification=fob/fey=42

fob=40*fey

Hence minimum diameter=diameter of objective/angular magnification

minimum diameter=72/42=1.714

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I'm pretty sure it'sssss A

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When a gas is rapidly compressed (say, by pushing down a piston) its temperature increases. When a gas expands against a piston,
shusha [124]

Answer:

Explained in explanation

Explanation:

The first law of thermodynamics states that the change in internal energy of a system(ΔU) is equal to the sum of the net heat transfer into the system(Q) and the net work done on the system(W). In equation, this law is;

ΔU = Q + W

Now, when there's gas inside a container with a movable piston that's tightly fitting, we will assume that the piston can move up and down thereby compressing the gas or allowing the gas to expand against it.

Now these gas molecules inside the container possess kinetic energy. Thus, the internal energy(U) of the system is simply the sum of all the kinetic energies of the individual gas molecules present in the container.

Therefore, if the temperature(T) of the gas increases, then the speed and internal energy(U) of the gas molecules will also increase. In the same way, if the temperature of the gas decreases, the speed and internal energy of the gas molecules would also decrease.

Now, back to the question, when the piston is pushed down, it does work on the gas and the gas does negative work on the piston. Thus, the gas will be get compressed to a smaller space, and thereby making the gas molecules to hit the piston at a faster rate. Thus, there is a decrease in speed and as we saw earlier that when there is a decrease in speed, it means temperature has decreased.

Whereas, when the piston is moved up, the gas does positive work on the piston and the speed of the gas molecules will increase. Like I said earlier that increase in speed means increase in temperature.

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Sulfur oxides (SO2) are responsible for
tigry1 [53]
B green house gases is the correct problem
5 0
2 years ago
Read 2 more answers
Find the total electric charge of 2.5 kg of electrons. Express your answer using two significant figures.
zimovet [89]

Answer : The total electric charge of electrons is, -4.4\times 10^{11}C

Explanation:

Answer : The number of electrons transferred are, 4.68\times 10^{20}

Explanation :

First we have to calculate the number of electrons.

Number of electrons = \frac{\text{Total mass of electrons}}{\text{Mass of one electron}}

Mass of 1 electron = 9.1\times 10^{-31}kg

Total mass of electron = 2.5 kg

Number of electrons = \frac{2.5kg}{9.1\times 10^{-31}kg}

Number of electrons = 2.75\times 10^{30}

Now we have to calculate the total electric charge of electrons.

Formula used :

Q=ne\\\\n=\frac{Q}{e}

where,

n = number of electrons transferred = 2.75\times 10^{30}

Q = charge on electrons = ?

e = charge on 1 electron = -1.602\times 10^{-19}C

Now put all the given values in the above formula, we get:

2.75\times 10^{30}=\frac{Q}{-1.602\times 10^{-19}C}

Q=-4.4\times 10^{11}C

Thus, the total electric charge of electrons is, -4.4\times 10^{11}C

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3 years ago
What is the weight on mass
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Answer:

6.39×10^23 kg is the weight on mass

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