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OlgaM077 [116]
3 years ago
12

Can someone help im not sure of my answer

Physics
1 answer:
GREYUIT [131]3 years ago
8 0

Answer:

Yes

Explanation:

But I feel also 2 is correct but your answer is right

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Two train whistles have identical frequencies of 220 Hz. When one train is at rest in the station sounding its whistle, a beat f
Natali5045456 [20]

Answer:

Speed of the approaching train = 15.45 m/s

Explanation:

Given:

Frequency F0 = 220 Hz

Beat frequency F1 = 10.0 Hz

Find:

Speed of the approaching train

Computation:

Approaching frequency F2 = 220 + 10.0 Hz

Approaching frequency F2 = 230 Hz

Doppler shift;

F = [(v+v0)/(v-vS)]F0

230 = [(340+v0)/(340-0)]220

V0 = 15.45 m/s

Speed of the approaching train = 15.45 m/s

3 0
3 years ago
C) What's meant by:<br> The electromotive force of an electric cell - 1.5 volt.
Ahat [919]

Answer:

The electromotive force is the voltage measured across the cell terminals when "NO" current is being drawn. That is why electromotive forces are used in Wheatstone Bridges which measure the resistance of an external object.

Just measuring the voltage across a cell does not give one the true EMF because current drawn from the cell will cause a reduction of voltage of I * R where R is the internal resistance of the cell.

3 0
3 years ago
PLS HURRY THIS IS DUE IN 5 mins
Dmitrij [34]

Answer:

(a) Waves P and Q have the same  wavelength but wave P has twice the  amplitude of wave Q.

(b) Waves Q and R have the same amplitude  but wave R has twice the wavelength  of wave Q.

(c) Wave  T shows a steady frequency but changing amplitude.

(d) Wave  S shows steady amplitude but a changing frequency.

e) Waves  Q and R have a low amplitude and a steady  frequency.

7 0
3 years ago
Which of the following describes an action-reaction pair?
xeze [42]

C. Your feet push down on the ground, and the ground pushes up on your feet.

6 0
4 years ago
Lightbulbs are typically rated by their power dissipation when operated at a given voltage. Which of the following lightbulbs ha
nata0808 [166]

Answer:

<em>The arrangement with the greatest resistance is the light bulb of option C. 4 W, 4.5 V</em>

Explanation:

The equation for electric power is

power P = IV

also,  I = V/R,

substituting into the equation, we have

P = \frac{V^{2} }{R}

R = \frac{V^{2} }{P}

a)  R = \frac{1.5^{2} }{0.8} = 2.8 Ω

b) R = \frac{3^{2} }{6} = 1.5 Ω

c) R = \frac{4.5^{2} }{4} 5.06 Ω

d) R = \frac{6^{2} }{8} = 4.5 Ω

from the calculations, one can see that the lightbulb with te greates resistance is

<em>C. 4 W, 4.5 V</em>

6 0
4 years ago
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