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3 years ago

What happens when you call someone using your cell phone?

1 answer:

8 0

Answer: B, Microwaves reach a cell tower, then fiber optic cables send the signal to a cell tower near the person you are calling.

Explanation:

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Explain what voltage,current, resistance are and how they relate to Ohms law. Then give examples

SOVA2 [1]

Voltage is the difference in charge between two points.
Current is the rate the charge flows
Resistance is the tendency a material has to resist the flow of charge (current)
Combining voltage resistance and current Ohm developed the formula
V (Voltage)= I (Current) x R (Resistance)

3 0

4 years ago

Why is the coefficient of friction independent of the mass?

Svet_ta [14]

Because the coefficient of friction depends on the surface

3 0

4 years ago

An electron is released from rest at the negative plate of a parallel-plate capacitor. If the distance across the plate is 2.0 m

ddd [48]

Answer:

Velocity of electron will be $1.325\times 10^6m/sec$

Explanation:

We have given distance across the plate d = 2 mm $=2\times 10^{-3}m$

Potential difference V = 6 volt

We know that potential difference at any distance is given by

V = Ed , here V is potential difference, E is electric field and d is distance

So $E=\frac{V}{d}=\frac{6}{2\times 10^{-3}}=3000N/C$

Charge on electron $e=1.6\times 10^{-19}C$

We know that expression of velocity is given by $v=\sqrt{\frac{2qEd}{m_e}}$ , here q is charge on electron, E is electric field and d is distance

So $v=\sqrt{\frac{2\times 1.6\times 10^{-19}\times 3000\times 3000}{9.11\times 10^{-31}}}=1.325\times 10^6m/sec$

8 0

4 years ago

to lift a load to roof, you apply 21 n of force to a pulley. the pulley applies 21 n of force to the load. what is the mechanica

MariettaO [177]

Answer:

The mechanical advantage of the pulley is 1.

Explanation:

The mechanical advantage of the pulley is given as

$MA=\frac{F}{f}$

Here, MA is represent for the mechanical advantage of the pulley, F is load for lift and f applied force.

Given F =21 N and f= 21 N.

Substitute the given values, we get

$MA=\frac{21N}{21N}$

MA = 1.

Thus, the mechanical advantage of the pulley is 1.

7 0

4 years ago

What causes the disease bronchitis?

Ilia_Sergeevich [38]

Answer:

Acute bronchitis can result from: a virus, for example, a cold or flu virus. a bacterial infection. exposure to substances that irritate the lungs, such as tobacco smoke, dust, fumes, vapors, and air pollution.

Explanation:

3 0

4 years ago