3 years ago

In track, there is a 1500 meter event. Is this distance more or less than a mile?

Physics

1 answer:

fenix001 [56]3 years ago

5 0

Less than because a mile is 1600 meters

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You toss a rock of mass mm vertically upward. Air resistance can be neglected. The rock reaches a maximum height hh above your h

skad [1K]

Answer:

The speed of the rock when it is at height h/4 is $\dfrac{\sqrt{3gh} }{2}$ .

Explanation:

At maximum height the final velocity of the rock is equal to 0. Let u is the initial velocity of the rock. Using the conservation of energy to find it as :

$u^2=2gh$ .......(1)

We need to find the speed of the rock when it is at height h/4. Let v' is the speed. Using 3rd equation of motion as :

$v'^2=u^2+2as$

here a = -g and s = h/4

$v'^2=u^2-2g\times \dfrac{h}{4}$

Using equation (1) :

$v'^2=(2gh)-2g\times \dfrac{h}{4}\\\\v'^2=\dfrac{3gh}{4}\\\\v'=\dfrac{\sqrt{3gh} }{2}$

So, the speed of the rock when it is at height h/4 is $\dfrac{\sqrt{3gh} }{2}$ . Hence, this is the required solution.

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3 years ago

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vampirchik [111]

Answer:

l m = 1000000000 nm

? = 0.001

= 0

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3 years ago

How can you tell that this is a combustion reactionn

d1i1m1o1n [39]

Answer:

May form in water carbon dioxide and other forms

Explanation:I hope I got this right don’t hate me if I mess up

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2 years ago

You walk 12.0 m West and then 4.00 m south. What is your displacement?

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Answer:

12.6 (3 sig. fig.)

Explanation:

(12^2 + 4^2)^1/2 = 12.6 (3 sig. fig.)

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This has all the answer (Data sheet, graph, answers to the questions, and the summary) :)

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3 years ago