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2 years ago

13

Thunder is heard 7.2 seconds after a bolt of lightning is observed. if the speed of sound is 349 m/s, how far away did the light

ning strike?

1 answer:

Natasha2012 [34]2 years ago

5 0

Answer:

2512.8 meters

Explanation:

s=d/t

by using speed formula

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Read 2 more answers

A stone thrown off a bridge 10m above a river has an initial velocity of 8ms at an angle of 25 degrees above the horizontal. Wha

Darina [25.2K]

Explanation:

It is given that,

Height above which the stone was thrown, h = 10 m

Initial velocity of the stone, u = 8 m/s

Angle above the horizontal, $\theta=25^{\circ}$

The horizontal component of velocity is, $u_x=v\ cos\theta=8\ cos(25)=7.25\ m/s$

The vertical component of velocity is, $u_y=v\ sin\theta=8\ cos(25)=3.38\ m/s$

Let t is the time of flight in vertical motion. The second equation of motion is :

$h=u_yt-\dfrac{1}{2}gt^2$

$10=3.38t-\dfrac{1}{2}\times 9.8t^2$

t = 0.34 seconds

Let s is the range of the stone. It can be calculated as :

$s=u_x\ cos\theta \times t$

$s=7.25\times 0.34$

s = 2.46 meters

So, the range of the stone is 2.46 meters. Hence, this is the required solution.

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