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Ann [662]
2 years ago
7

A plane flies 470 km east from city A to city B in 45.0 min and then 966 km south from city B to city C in 1.50 h. For the total

trip, what are the (a) magnitude and (b) direction of the plane's displacement, the (c) magnitude and (d) direction of its average velocity, and (e) its average speed?
Physics
1 answer:
noname [10]2 years ago
3 0

Answer:

a) 1074.27 km

b) 64.06^{\circ}

c) 477.453 km/h

d) 638.22 km/h

Explanation:

From Pythagoras theorem

AC² = AB²+BC²

AC=\sqrt{AB^2+BC^2}\\\Rightarrow AC=\sqrt{(-470)^2+(-966)^2}\\\Rightarrow AC=1074.27\ km

Displacement = 1074.27 km

tan\theta=\frac{\text{Opposite side}}{\text{Adjacent side}}\\\Rightarrow tan\theta=\frac{966}{470}\\\Rightarrow \theta=tan^{-1}\frac{-966}{-470}\\\Rightarrow \theta=64.06^{\circ}

Direction = 64.06^{\circ}

Average velocity

v_{av}=\frac{1074.27}{2.25}\\\Rightarrow v_{av}=477.453\ km/h

Average velocity = 477.453 km/h

Average speed

s_{av}=\frac{470+966}{2.25}\\\Rightarrow s_{av}=638.22\ km/h

Average speed = 638.22 km/h

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(a) For series circuit, current in 14 ohms = current in 72 ohms = 0.698 A

(b) Power loss in each series resistor, 14 ohms = 6.82 W and 72 ohms = 35.1 W.

(c) For parallel circuit, current in 14 ohms = 4.29 A and current in 72 ohms = 0.83 A

(d) Power loss in each parallel resistor, 14 ohms = 257.4 W and 72 ohms = 49.8 W.

<h3>Current in each series resistors</h3>

The total resistance = R1 + R2

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Current = V/R = 60/86 = 0.698 A

Since the resistors are in series, current in 14 ohms = current in 72 ohms = 0.698 A

<h3>Power loss in each series resistor</h3>

P = I²R

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P(72 ohms) = (0.698)² x 72 = 35.1 W

<h3>Current in each resistor for parallel arrangement</h3>

Total resistance, 1/R = 1/R1 + 1/R2

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F = 5.625\,N (Fuerza de repulsión/Repulsive force)

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