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2 years ago

A train travels 160 km in 2 h. What is the train’s average speed in km/h?

Physics

2 answers:

White raven [17]2 years ago

4 0

Answer:

80 km/h

Explanation:

Average Speed= Distance travelled / time

= 160/2

= 80

loris [4]2 years ago

3 0

The train’s average speed is 80km/h

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If Tony and Tanya both run at the same speed and in the same direction and they both run for the same amount of time, what can y

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2 years ago

You are inside a room, 15 m from the west wall, which has two doors (similar to slits) and you are centered between the two open

andre [41]

Answer:

The distance of first minimum from central maxima is 4.25 m

The spacing between maxima in sound intensity is 8.5 m.

Explanation:

Given that,

Distance D= 15 m

Frequency = 200 Hz

distance between slits a=3 m

We know that,

The width of fringe,

$\beta=\dfrac{\Lambda D}{a}$

$\beta=\dfrac{vD}{fa}$

(a). We need to calculate the distance of first minimum from central maxima

Using formula for distance

$d=\dfrac{\beta}{2}$

$d=\dfrac{vD}{2fa}$

Put the value into the formula

$d=\dfrac{340\times15}{2\times200\times3}$

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(b). We need to calculate the spacing between maxima in sound intensity

Using formula for the distance of first maxima

$d'=2d$

$d'=2\times4.25$

$d'=8.5\ m$

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The spacing between maxima in sound intensity is 8.5 m.

6 0

3 years ago