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ipn [44]
3 years ago
8

At which position is the northern hemisphere experiencing winter?

Physics
1 answer:
Leto [7]3 years ago
6 0

The answer would be point A.

Hope this helped you.

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Electronic flash unit cameras contain a capacitor for storing the energy used to produce the flash. In one such unit the flash l
Stolb23 [73]

Answer:

(A) 421 J energy stored in the capacitor for one flash.

(B) The value of capacitance is 0.0537 F

Explanation:

Given :

(A)

Time t = \frac{1}{675}

Average power P = 2.7 \times 10^{5} W

From power equation,

   P= \frac{E}{t}

So energy in one light is given by,

   E = Pt

  E = 2.7 \times 10^{5} \times \frac{1}{675}  = 400 J

Since efficiency is 95 % so we can write, energy stored in one flash,

E_{tot} = \frac{400}{0.95} = 421 J

(B)

From the formula of energy stored in capacitor,

 E = \frac{1}{2}C V^{2}

Where E = E_{tot} and V = 125 V

 C = \frac{2E}{V^{2} }

 C = \frac{2 \times 421}{15625}

 C = 0.0537 F

8 0
3 years ago
Which explanation is based on scientific evidence?​
Yuki888 [10]

Answer:

Scientific evidence is evidence that serves to either support or counter a scientific theory or hypothesis. Such evidence is expected to be empirical evidence and interpretable in accordance with scientific method.

5 0
3 years ago
skater spins over a point at a speed of 3.0 rotations per second then the momentum of inertia is 0.60 kg.M2, what is its angular
laiz [17]

Answer:

L=11.3\ kg-m^2/s

Explanation:

Given that,

Angular speed of a skater, \omega=3\ rot/s=18.84\ rad/s

The moment of inertia of the skater, I = 0.6 kg-m²

We need to find the angular momentum of the skater. The formula for the angular momentum of the skater is given by :

L=I\omega

Substitute all the values,

L=0.6\times 18.84\\\\L=11.3\ kg-m^2/s

So, its angular momentum is equal to 11.3\ kg-m^2/s.

8 0
3 years ago
An inductor is connected to a 26.5 Hz power supply that produces a 41.2 V rms voltage. What minimum inductance is needed to keep
alexira [117]

Answer:

The minimum inductance needed is 2.78 H

Explanation:

Given;

frequency of the AC, f = 26.5 Hz

the root mean square voltage in the circuit, V_{rms} = 41.2 V

the maximum current in the circuit, I₀ = 126 mA

The root mean square current is given by;

I_{rms} = \frac{I_o}{\sqrt{2} } \\\\I_{rms}  = \frac{126*10^{-3}}{\sqrt{2} }\\\\I_{rms}  =0.0891 \ A

The inductive reactance is given by;

X_l = \frac{V_{rms}}{I_{rms}} \\\\X_l= \frac{41.2}{0.0891}\\\\X_l = 462.4 \ ohms

The minimum inductance needed is given by;

X_l = \omega L\\\\X_l = 2\pi  fL\\\\L = \frac{X_l}{2\pi f}\\\\L = \frac{462.4}{2\pi *26.5}\\\\L = 2.78 \ H

Therefore, the minimum inductance needed is 2.78 H

7 0
3 years ago
Hello, why do all electromagnetic waves travel at the same speed in vacuum?
Viktor [21]

Answer:

due to the magnetic field

Explanation:

magnetic field is the same in the vacuum

6 0
3 years ago
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