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2 years ago

Determina la velocidad de un avión que recorre 459 km en 67 min

Physics

1 answer:

satela [25.4K]2 years ago

4 0

Answer:

122397.7

Explanation:

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As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor:_______.

Akimi4 [234]

Answer:

b. approaches infinity

Explanation:

Because Capacitive reactance is given as Xc = 1/ωC

So we can see that the value of capacitive reactance and therefore its overall impedance (in Ohms) decreases to zero as the frequency increases acting like a short circuit.

Same as the frequency approaches zero or DC, the capacitors reactance increases to infinity, acting like an open circuit which is why capacitors block DC

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3 years ago

What is the difference between a low tide and a high tide

Savatey [412]

A high tide means when the water has risen and is higher up(closer to high up land). Low tide is when it’s receded

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2 years ago

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How does a resistor affect the speed of the current that passes through it?

Maksim231197 [3]

A resistor DECREASES the speed of current as a resistors job is to resist the flow of electrons

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2 years ago

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1. It s defficult to lift a heavier stone than the lighter one. why

stiks02 [169]

Answer:

lThe effect of the attraction of the earth on a bigger stone can be observed more than the effect of attraction of the earth on a smaller one. hence it is difficult to lift a large stone than the smaller one on the earth surface.

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2 years ago

When an automobile moves with constant velocity, the power developed is used to overcome the frictional forces exerted by the ai

geniusboy [140]

Answer:

The total frictional force is 358.0 newtons

Explanation:

Power is the amount of average work (W) an object does on a period of time (Δt):

$P=\frac{W}{\Delta t}$

Remember average work is average force (F) times displacement (Δs):

$P=\frac{F \Delta s}{\Delta t}$

but displacement over time is average speed $v=\frac{\Delta s}{\Delta t}$ , then:

$P=Fv$ (1)

That is, the power of the car is the force the engine does times the speed of the car. As the question states, if the car is at constant velocity then the power developed is used to overcome the frictional forces exerted by the air and the road, that is by Newton's first law, the force the motor of the car does is equal the force of frictional forces. So, to find the frictional forces we only have to solve (1) for F:

$F=\frac{P}{v}$

Knowing that 1hp is 746W then 30hp=22380W and 1 mile = 1609m then 140 mph = 225308 $\frac{m}{h}$ = $62.5 \frac{m}{s}$ , then:

$F=\frac{22380}{62.5}=358.0 N$

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2 years ago

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