a stone is dropped from the top of 50 m high tower simultaneously another stone is thrown upward with a speed of 20 m/s . calculate the time at which both the stones cross each other

Answers

Answer 1

Answer: 'H' = height at any time
'T' = time after both actions
'G' = acceleration of gravity
'S' = speed at the beginning of time
Let's call 'up' the positive direction.
Let's assume that the tossed stone is tossed from the ground, not from the tower.

For the stone dropped from the 50m tower:

H = +50 - (1/2) G T²

For the stone tossed upward from the ground:

H = +20T - (1/2) G T²

When the stones' paths cross, their Heights are equal.

50 - (1/2) G T² = 20T - (1/2) G T²

Wow ! Look at that ! Add (1/2) G T² to each side of that equation,
and all we have left is:

50 = 20T Isn't that incredible ? ! ?

Divide each side by 20 :

2.5 = T

The stones meet in the air 2.5 seconds after the drop/toss.

I want to see something:
What is their height, and what is the tossed stone doing, when they meet ?

Their height is +50 - (1/2) G T² = 19.375 meters

The speed of the tossed stone is +20 - (1/2) G T = +7.75 m/s ... still moving up.
I wanted to see whether the tossed stone had reached the peak of the toss,
and was falling when the dropped stone overtook it. The answer is no ... the
dropped stone was still moving up at 7.75 m/s when it met the dropped one.

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Convert the following:a)2500 kilogram into gram.
b)335 hours into seconds.
c)1 day into seconds.

Answers

Explanation:

A) 1 kg = 1000g

2500kg = 2500000g

B 1 hour = 3600 sec

335 hour = 1206000sec

C 1day = 24 hours

1 hour = 3600 sec

24 hours = 86400sec

Answers:

a.2500000grams

B.1206000seconds

c.86400seconds.

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Why is carbon unique among the elements?????

Answers

Because no living organism can exist without carbon. It is the essence if life. Every single living thing that breathes or moves or produce is made up if carbon

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

Answers

Chromium is represented by the element Cr with an atomic number of 24 and a molar mass of 52 gram per mole. The number of protons in the Chromium atom is the atomic number, so it has 24 protons. And the protons of chromium atom is equal to the number of electrons, so 24 electrons.

Answer:

Explanation:

Sally is training for the 1,000-meter running race at her school. Her goal is to place third or better. How can Sally determine if she is making progress toward her goal?

Answers

She can monitor her practice run times to see if they are decreasing.

Answer: a

Explanation:

Holden is trying to determine the velocity of his race car. He went 20 meters east, turned around, and went 40 meters west. He turned the car one more time and went 35 meters east. His car was 15 meters from the starting line. This took 5 seconds.What is the car’s velocity?
A. 3 m/s west

B.3 m/s east

C. 19 m/s west

D. 19 m/s east

Answers

Although the car's average speed is 19 m/s ,
its velocity is 3 m/s east.

Velocity is (displacement) / (time)

and Displacement is the distance between the start point and
end point, no matter what route was traveled between them.

In this case, the displacement is 15 meters east.
So the velocity is

(15 meters east) / (5 sec) = 3 meters/sec east .

Answer:

i dont know what he said but i think C

Explanation:

Why do oil tankers sit lower in water

Answers

When a lower tank is damaged, the incoming sea water pushes the oil in the damaged tank up into the ballast tank. Because of the hydrostatic pressure, there is an automatic transfer out of the damaged tank. The double-hull design is aimed at the probability of zero outflow.

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