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nikitadnepr [17]
3 years ago
11

How many stars can be seen without a telescope on earth

Physics
1 answer:
belka [17]3 years ago
5 0

There are only about 5,000 stars visible to the naked, average, human eye, . And, because the Earth itself gets in the way, you can only see about a half of those from where you stand.

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A wire of length L is wound around an iron cylinder mounted on a base. The two ends of the wire are connected to a battery via a
Bond [772]

Answer:

The ring will move away from the rod and fly upward

Explanation:

3 0
4 years ago
Una ambulancia se desplaza por la calle a 34 m/s emitiendo un estruendoso sonido de sirena a 304 Hz, Si usted se ALEJA de la amb
Alik [6]

Answer:

f = 295.06 Hz

Explanation:

Este es un típico ejercicio de efecto doppler donde tenemos una fuente emisora de una frecuencia.

En este caso, vemos una ambulancia que se está desplazando a cierta velocidad emitiendo una frecuencia particular. Un observador que está en la calle decide alejarse, corriendo a una velocidad, que obviamente es menor que la de la ambulancia, pero el caso es que se está alejando de la fuente emisora del sonido, en este caso de la ambulancia.

Como se están alejando, podemos usar la siguiente expresión:

f = (v - v₀ / v) * f₀

Donde:

f: frecuencia percibida por la persona.

v: velocidad de la ambulancia

v₀: velocidad de la persona

f₀: frecuencia emitida por la ambulancia.

Teniendo todos esos valores, solo debemos reemplazar en la expresión:

f = (34 - 1 / 34) * 304

f = (33/34) * 304

<h2>f = 295.06 Hz</h2>

Espero te ayude

6 0
3 years ago
Calculate δe, if the system absorbs 7.24 kj of heat from the surroundings while its volume remains constant (assume that only p−
butalik [34]
I believe the answer is 7.24 kJ.
From the equation ΔE = dW + dQ; where W is the work done on/by the system and Q is the heat the system absorbs/loses.
Therefore; ΔE = 72.4 kJ since the system has bot done any p-v work (dV= zero) and has absorbed heat.
4 0
3 years ago
Read 2 more answers
Physical
zysi [14]

Answer: 2.5

Explanation:

4 0
3 years ago
What type of energy is found in fossil fuels?
vladimir1956 [14]

Answer:The energy in fossil fuels (coal, oil, gas)

Explanation:

5 0
3 years ago
Read 2 more answers
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