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Nadya [2.5K]
3 years ago
7

Formation of a precipitate is usually evidence of?

Physics
2 answers:
VMariaS [17]3 years ago
6 0
<span>Formation of precipitate is usually an evidence of a chemical change. The precipitate is a new substance that gets created due a chemical reaction between two or more different substances.  The precipitate can be the formation of a solid within a liquid or the formation of a solid within a solid due to a chemical reaction or change. The solid formation within a liquid is known as precipitate. This kind of chemical reaction can be seen in normal and daily life, as well as in laboratories.</span>


IRISSAK [1]3 years ago
5 0

a chemical change               is the answer

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What happens to the resistance of a wire as its length increases? A. The resistance decreases. B. The resistance is not affected
kondor19780726 [428]

Answer:

D. The resistance increases.

Explanation:

Resistance of a wire is R = ρL/A, where ρ is the resistivity of the wire, L is the length, and A is the cross sectional area.

As L increases, R increases.

3 0
3 years ago
Identify what happens to the kinetic energy (KE) and gravitational potential energy (PE) of a rock as it falls.
Oksi-84 [34.3K]

Answer:

KE increases and PE decreases.

Explanation:

<u>POTENTIAL ENERGY (PE)</u>:

The potential energy of the rock depends upon the height of the rock, as given by the following formula:

P.E = mgh

Therefore, the potential energy will be highest at the initial point due to the highest height attained by rock. As the rock falls, its height will decrease as a result its <u>potential energy will also decrease</u>.

<u>KINETIC ENERGY (KE)</u>:

The kinetic energy of the rock depends upon the velocity of the rock, as given by the following formula:

K.E = \frac{1}{2}mv^2

Therefore, the kinetic energy will be zero at the initial point due to the zero velocity of the rock. As the rock falls, its velocity will increase as a result its <u>kinetic energy will also increase</u>.

Hence, the correct option will be:

<u>KE increases and PE decreases.</u>

3 0
3 years ago
What conditions would have to exist in order for a space station to support life
amid [387]

Answer:

Mechanical life support system

Explanation:

Mechanical life support system is one which allows humans to survive on places or conditions which are not natural to their survival so by the help of mechanical devices humans can survive in places like underwater or in space.

The life support system may not only provide water, air and food but it should also keep a proper check on the maintenance of body pressure, temperature, management of the waste product and the absorption or the radiations from the body itself.

Thus mechanical life support system are designed with the hep of high engineering techniques for the safety and security as these are life-critical.

4 0
3 years ago
If the position of a particle on the x-axis at time t is −5t2, then the average velocity of the particle for 0 ≤ t ≤ 3 is
Drupady [299]

Answer:

v = 15 m / s

Explanation:

In this exercise we are given the position function

          x = 5 t²

and we are asked for the average velocity in an interval between t = 0 and t= 3 s, which is defined by the displacement between the time interval

          v= \frac{v_{f} - v_{o} }{t_{f} - t_{o} }

let's look for the displacements

        t = 0     x₀ = 0 m

        t = 3     x_{f} = 5 3 2

                     x_{f} = 45 m

 

we substitute

           v = \frac{45 -0}{3 - 0}

           v = 15 m / s

3 0
3 years ago
What did johannes kepler contribute to the study of planets
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Despite the fact that Kepler is best known for characterizing laws in regards to planetary movement, he made a few other striking commitments to science. He was the first to discover that refraction drives vision in the eye and that utilizing two eyes empowers profundity recognition.
4 0
3 years ago
Read 2 more answers
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