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antoniya [11.8K]
4 years ago
13

A motorcycle has a velocity of 24 m/s, due south as it passes a car with a velocity of 15 m/s due north. What is the magnitude a

nd direction of the velocity of the motorcycle as seen by the driver or car?
A. 39 m/s, southB. 9 m/s, northC. 39 m/s, northD. 15 m/s, south
Physics
1 answer:
Amiraneli [1.4K]4 years ago
7 0

Answer:

39 m/s north

Explanation:

Let us consider North direction as positive and south as negative

Velocity of motorcycle = -24 m/s

Velocity of car = +15 m/s

The Velocity of the motorcycle as seen by the driver or car

15-(-24)=39\ m/s

The speed of the motorcycle as seen by the driver or car is 39 m/s as it is positive the direction is north

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Linear expansivity(∝) of a metal : Is defined as an increase in length per unit length for one degree rise in temperature.

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∝= (L₁-L₂)/(L₁ΔT)........................ Equation 1

∴ L₂ = L₁ + (1 + ∝ΔT)....................... Equation 2

Where ∝ = linear expansivity of the metal ( K⁻¹), L₁ = Initial length (m), L₂ = Final length ( m )

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∴ L₂ = L₁ + (1 + ∝ΔT)....................... Equation 2

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Conversion

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L₂ = 38 + (1 + 0.00327)

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L₂ = 39.00327 m.

Therefore, length of the Steel beam = 39.00327 m

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