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3 years ago

What does an electromagnet do?

1 answer:

8 0

An electromagnet is a device that sends electricity through a coil of wire to produce a magnetic field. This leads to a magnet that can be controlled - turned on and off with the flip of a switch, or increased or decreased in strength. The coils are often wrapped around a regular magnet to make it stronger.

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A 32-ounce stack of paper is at a temperature of 65°F. Then the paper is divided into fourths. The amount of thermal energy in e

Yakvenalex [24]

C because the stack of paper was divided into 4

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3 years ago

The height a ball bounces is less than the height of the previous bounce due to friction. The heights of the bounces form a geom

AlladinOne [14]

Answer:

Explanation:

Let the first height be h . second height .75h

third height .75h . fourth height .75²h

fifth height .75²h , sixthth height .75³ and so on

Total distance consists of two geometric series as follows

1 ) first series

h + .75h + .75²h + .75³h......

2 ) second series

.75h +.75²h +.75³h + .75⁴h .......

Sum of first series :

first term a = h , commom ratio r = .75

sum = a / (1 - r )

= h / 1 - .75

= h / .25

sum of second series :--

first term a = .75 h , commom ratio r = .75

sum = a / (1 - r )

= .75h / 1 - .75

= .75h / .25

Total of both the series

= 4h + 3h

= 7h .

h = 1 m

Total distance = 7 m

6 0

3 years ago

A train is traveling at 30.0 m/sm/s relative to the ground in still air. The frequency of the note emitted by the train whistle

Zigmanuir [339]

Answer

given,

speed of sound = 344 m/s

speed of train = 30 m/s

frequency emitted by the train = 262 Hz

Doppler's effect

$f_L = \dfrac{v + v_L}{v + v_s}\ f_S$

f_L is the frequency of listener

f_S is the frequency of the source of the sound

v is the speed of the sound

v_L is the speed of listener.

v_S is the speed of the source

a) Speed of the passenger in another train , v = 18 m/s

another train is moving in opposite direction and approaching

v_L is positive as the listener is moving forward.

v_S is negative at the source is moving toward the listener.

$f_L = \dfrac{344 + 18}{344 - 30}\times 262$

$f_L = 302\ Hz$

b) Speed of the passenger in another train , v = 18 m/s

another train is moving in opposite direction and receding

v_L is negative as the listener is moving away from source.

v_S is positive at the source is moving away the listener.

$f_L = \dfrac{344 - 18}{344 + 30}\times 262$

$f_L = 228.37\ Hz$

8 0

3 years ago

What is coldest planet in solar system?

Helga [31]

Im pretty sure its neptune. Its mot pluto because its not a planet. Good luck.

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3 years ago

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What is elementary entities?

Serhud [2]

Are any of several entities such as electrons, neutrons , protons that are less complex than atoms

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3 years ago

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