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3 years ago

Wire coils spinning between two magnets will produce …?

2 answers:

7 0

The answer is B.

Magnetic fields can be used to make electricity
Moving a magnet around a coil of wire, or moving a coil of wire around a magnet, pushes the electrons in the wire and creates an electrical current. Electricity generators essentially convert kinetic energy (the energy of motion) into electrical energy.

klemol [59]3 years ago

6 0

Answer:

Explanation:

I don't know but its b

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You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the sh

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Answer:

Explanation:

Power is work divided by time:

P = W / t

Work is force times distance:

W = F d

Therefore:

P = F d / t

Given that F = 500 N, d = 60 m, and t = 240 s:

P = 500 N * 60 m / 240 s

P = 125 W

Answer is C.

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3 years ago

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3 years ago

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Gekata [30.6K]

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Explanation:

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3 years ago

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Starting from rest, your friend dives from a high cliff into a deep lake below, yelling in excitement at the thrill of free-fall

Olegator [25]

Answer:

2 seconds

Explanation:

f = Frequency of yell = 919 Hz

$\Delta f$ = Shifted frequency = 55.9 Hz

v = Speed of sound in air = 342 m/s

$v_r$ = Velocity of friend

a = Acceleration due to gravity = 9.81 m/s²

From the Doppler shift formula we have

$\dfrac{f+\Delta f}{f}=\dfrac{v}{v-v_r}\\\Rightarrow v_r=v-\dfrac{vf}{f+\Delta f}\\\Rightarrow v_r=342-\dfrac{342\times 919}{919+55.9}\\\Rightarrow v_r=19.61\ m/s$

The velocity of the my friend is 19.61 m/s

$v=u+at\\\Rightarrow t=\dfrac{v-u}{a}\\\Rightarrow t=\dfrac{19.61-0}{9.8}\\\Rightarrow t=2\ s$

The time my friend is in the air is 2 seconds

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3 years ago