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Sergio [31]
3 years ago
13

Electromagnets in radios can be used to A) play a CD. B) create sound. C) change the station. D) make a remote control.

Physics
2 answers:
SSSSS [86.1K]3 years ago
5 0
Change the station....
Vesna [10]3 years ago
5 0
The answer is change the station
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Wha is amplitde in sound
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Answer:

The number of molecules displaced in a vibration makes the amplitude of a sound.

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Calculate the acceleration if you push with a 20-N horizontal force on a 2-kg block on a horizontal friction-free air table
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Acceleration = force / mass = 20 / 2 = 10 m/s^2
3 0
3 years ago
An elevator motor provides 45.0 kW of power while lifting an elevator 35.0 m. If the elevator contains seven passengers each wit
mylen [45]

Find how much work ∆<em>W</em> is done by the motor in lifting the elevator:

<em>P</em> = ∆<em>W</em> / ∆<em>t</em>

where

• <em>P</em> = 45.0 kW = power provided by the motor

• ∆<em>W</em> = work done

• ∆<em>t</em> = 20.0 s = duration of time

Solve for ∆<em>W</em> :

∆<em>W</em> = <em>P</em> ∆<em>t</em> = (45.0 kW) (20.0 s) = 900 kJ

In other words, it requires 900 kJ of energy to lift the elevator and its passengers. The combined mass of the system is <em>M</em> = (<em>m</em> + 490.0) kg, where <em>m</em> is the mass of the elevator alone. Then

∆<em>W</em> = <em>M</em> <em>g h</em>

where

• <em>g</em> = 9.80 m/s² = acceleration due to gravity

• <em>h</em> = 35.0 m = distance covered by the elevator

Solve for <em>M</em>, then for <em>m</em> :

<em>M</em> = ∆<em>W</em> / (<em>g h</em>) = (900 kJ) / ((9.80 m/s²) (35.0 m)) ≈ 2623.91 kg

<em>m</em> = <em>M</em> - 490.0 kg ≈ 2133.91 kg ≈ 2130 kg

4 0
3 years ago
George saves 18% of his total gross weekly earnings from his two part-time jobs he earns $6.25 per hour from one part time job a
masha68 [24]
Weekly wages and the amount saved each week

5 0
3 years ago
Read 2 more answers
An automobile traveling on a straight, level road has an initial speed v when the brakes are applied. In coming to rest with a c
Molodets [167]

Answer:

4x

Explanation:

Use v^{2} = u^{2} +2as to do the question.

For first instance,

0 = v^{2} +2ax -------------------( 1 )

for second instance,

0 = (2v)^{2} +2as-----------------( 2 )

So by (1) and (2),

s = 4x

3 0
3 years ago
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