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liraira [26]
3 years ago
7

How long does it take an airplane to fly 1500 miles of it maintains a speed of 600 miles per hour?

Physics
2 answers:
prisoha [69]3 years ago
7 0
2.5 hours. divide 15000 by 600




iVinArrow [24]3 years ago
5 0

Answer: 2.5 hours

Explanation: speed = distance / time.

Speed = 600 miles/hour.

Distance. = 1500 miles.

Time = unknown (t)

Speed = distance / time.

Therefore,

Time = Distance / Speed.

Time (t) = 1500 (miles) / 600 (miles/hour)

Time (t) = 2.5 hours or 2 hours, 30 mins

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A "590-W" electric heater is designed to operate from 120-V lines.
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Answer:

a) 24.4 Ω

b) 4.92 A

c) 495.9 W

d)

c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.

Explanation:

b)

The formula for power is:

P = IV

where,

P = Power of heater = 590 W

V = Voltage it takes = 120 V

I = Current Drawn = ?

Therefore,

590 W = (I)(120 V)

I = 590 W/120 V

<u>I = 4.92 A</u>

<u></u>

a)

From Ohm's Law:

V = IR

R = V/I

Therefore,

R = 120 V/4.92 A

<u>R = 24.4 Ω</u>

<u></u>

c)

For constant resistance and 110 V the power becomes:

P = V²/R

Therefore,

P = (110 V)²/24.4 Ω

<u>P = 495.9 W</u>

<u></u>

d)

If the resistance decreases, it will increase the current according to Ohm's Law. As a result of increase in current the power shall increase according to formula (P = VI). Therefore, correct option is:

<u>c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.</u>

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