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3 years ago

Must new substances be formed when you observe a chemical property? Explain

1 answer:

5 0

Yes. It is rather a natural phenomenon. If you search and understand the process of chemical change or reaction that results to its chemical property outcome, it has a new formed substance. Unlike physical change or reaction it only changes in shape or form but the substance, compound or element in the matter is till the same. Furthermore, when chemical change is undergoing you notice the change in shape, size and from like the physical change but there is a change in the element, compound or substance. When you lit a fire on a paper the fire disorients, disorganizes and disturb the former positions of the atoms and because of the fire as catalyzer the atoms did its behavior –changing both intrinsic and extrinsic.

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Ball B is suspended from a cord of length l attached to cart A, which can roll freely on a frictionless, horizontal track. The b

Kazeer [188]

Answer:

a.Velocity of A and Velocity of B will be opposite in direction.

b.Both velocities have the same direction.

c. The two objects will move in a direction of some angle α.

Explanation:

When the angle gets maximum the velocities of the two objects pull each other and move in opposite direction. But when the two objects make an angle zero degree with each other their motion is in the same direction.

7 0

3 years ago

Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a

Andrews [41]

Answer:

37.545 m/s

Explanation:

f' = Actual frequency of horn = 269 Hz

f = Observed frequency of horn = 290 Hz

v = Speed of sound in air = 343 m/s

$v_0$ = Speed of second train = 13.7 m/s

$v_s$ = Speed of first train

From Doppler effect we have

$f=f'\dfrac{v-v_0}{v-v_s}\\\Rightarrow v_s=v-\dfrac{f'}{f}(v-v_0)\\\Rightarrow v_s=343-\dfrac{269}{290}(343-13.7)\\\Rightarrow v_s=37.545\ m/s$

The speed of the first train is 37.545 m/s

5 0

3 years ago

Organism would make the best index fossil. Answers a , b , c , d please help

aivan3 [116]

Answer: You didn't put what a, b, c, or d is so how is anyone supposed to know what the answer is?

5 0

3 years ago

Read 2 more answers

Why are electromagnets used in metal scrap yards<br> PLEASE HELP!!!!!!

Alinara [238K]

To help pick to up the metal and place it in a incinerator <span />

4 0

3 years ago

Four seconds after being launched, what is the height of a ball that starts from a height of 12 m with an initial upward velocit

MrMuchimi

Answer:

15.24 m/s in the downward direction

Explanation:

Given that the initial upward velocity of the ball is 24 m/s.

Assuming that the upward direction is positive.

As gravitational force acts in the downward direction and the direction of acceleration is the same as the direction of force, so the acceleration due to gravity will be negative.

Now, from the equation of motion, when an object is launched with initial velocity u, the final velocity, v, of an object after time t is v=u+at.

Given that u=24 m/s, t=4 seconds, $g=-9.81 m/s^2$ .

So, the final velocity is

$v= 24 + (-9.81)\times 4 \\\\\Rightarrow v= 24-9.81\times 4$

$\Rightarrow v=-15.24$ m/s

Here, the negative sign means the final velocity is in the downward direction.

Hence, the velocity after 4 seconds is 15.24 m/s in the downward direction.

8 0

3 years ago