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4 years ago

What’s the difference between AC and DC generators and how do they work? i need help asap thanks

1 answer:

3 0

Answer:In an AC generator the electrical current periodically reverses it direction,while in a DC generator the electrical current only flow in one direction

Explanation:in an AC generator the electrical current periodically reverses it direction,while in a DC generator the electrical current only flows in one direction.the major difference between an AC and DC generator is that an AC generator require a mechanism to produce DC output

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Anastaziya [24]

Answer:

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3 years ago

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Which range is the approximate audible range for humans?

allsm [11]

Answer:

Explanation:

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3 years ago

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A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of

Inessa05 [86]

initial height of the pole vaulter = 4.2 m

height of the pole vaulter just before it touch the pad = 80 cm

so the total displacement of pole vaulter just before he will touch the pad = 4.2 - 0.80 = 3.4 m

now by kinematics

$v_f^2 - v_i^2 = 2a d$

$v_f^2 - 0^2 - 2* 9.8*3.4$

$v_f^2 = 66.64$

$v_f = 8.16 m/s$

now after this he will come to rest after compressing the pad by 50 cm

so again we can use kinematics to find its acceleration

$v_f^2 - v_i^2 = 2 a d$

$0 - 8.16^2 = 2*a*0.50$

$a = -66.64 m/s^2$

so here its acceleration will be - 66.64 m/s^2

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3 years ago

How does a pith ball electroscope work

Mice21 [21]

Answer:

look at the explanation

Explanation:

This pith-ball electroscope is used to detect the presence of a static electricity charge. The two lightweight “pith” balls suspended from the strings are attracted to objects with a static electric charge. The pith balls can also be charged by touching them to an object with a static electric charge.

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3 years ago

If a flea can jump straight up to a height of 0.410 m , what is its initial speed as it leaves the ground?

aivan3 [116]

Initial velocity = $v_0$