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2 years ago

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Explain,'The Theory of Relativity' briefly.

Physics

1 answer:

nirvana33 [79]2 years ago

3 0

Answer:

The theory of Relativity state that :Special relativity applies to all physical phenomena in the absence of gravity and General relativity explains the law of gravitation and its relation to other forces of nature. 

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Wind and oceans are example of which current A.conduction B.Convection C.Radiation

SOVA2 [1]

Answer:

B convection MERRY CHRISTMAS

Explanation:

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2 years ago

Which statement correctly describes the gravitational potential energy of the pendulum based on this diagram?

MrRa [10]

I think it's 'C' but I won't know for sure until you let me see the diagram.

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3 years ago

A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may n

uranmaximum [27]

The Doppler effect is the right concept to solve this problem. The Doppler effect is understood as the change in apparent frequency of a wave produced by the relative movement of the source with respect to its observer. Mathematically it can be described as,

$f = (1-\frac{v_0}{v})f_0$

Here,

$f_0$ = Frequency of the sound from the Whistle

f = Frequency of sound heard

v = Speed of the sound in the Air

Replacing we have that

$1- \frac{v_0}{343} = \frac{20kHz}{21kHz}$

$\frac{v_0}{343} = 1-\frac{20}{21}$

$\frac{v_0}{343} = \frac{1}{21}$

$v_0 = \frac{1}{21}(343)$

$v_0 = 16.33m/s$

Therefore the minimum speed to know if the whistle is working is 16.33m/s

3 0

3 years ago

1. On a force vs. mass graph, what would be the slope of the line?

Luden [163]

1. By Newton's second law,

F = m a

so the slope of the line would represent the mass of the object.

2. If all the forces are balanced, then the object is in equilibrium with zero net force, which in turn means the object is not accelerating. So the object is either motionless or moving at a constant speed.

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3 years ago

A heat pump operates on a Carnot heat pump cycle with a COP of 8.7. It keeps a space at 248C by consum-ing 2.15 kW of power. Det

Marizza181 [45]

Answer:

Heat of the reservoir is 461.38 K or 188.1 °C

The heating load is 18.705 kW

Explanation:

COP = 8.7

working temperature $T_{h}$ = 248 °C = 248 + 273.3 = 521.3 K

work power W = 2.15 kW

reservoir temperature $T_{c}$ = ?

heating load Q = ?

We know that

COP = Q/W

Q = COP x W = 8.7 x 2.15 = 18.705 kW

Also,

COP = $\frac{T_{h} }{T_{h}- T_{c} }$ = $\frac{521.3}{521.3- T_{c} }$

8.7 = $\frac{521.3}{521.3- T_{c} }$

4535.31 - 8.7 $T_{c}$ = 521.3

4535.31 - 521.3 = 8.7 $T_{c}$

4014.01 = 8.7 $T_{c}$

$T_{c}$ = 4014.01/8.7 = 461.38 K

or 461.38 -273.3 = 188.1 °C

3 0

3 years ago