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4 years ago

How does the law of the conservation of mass relate to "You can't get something for nothing

1 answer:

8 0

You can't get something from nothing is practically stating the law. The law means states that energy can't be created or destroyed, in other words, it's constant. So in saying so, you truly can't get something from nothing

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A box experiencing a gravitational force of 600 N is being pulled to the right with force of 250 N. A 25 N frictional force acts

jeka57 [31]

The answer is: 0 Newtons

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3 years ago

Read 2 more answers

True or false as heat and pressure decreases one type of metamorphic rock will transform into another type

dezoksy [38]

Answer: True

Explanation: Metamorphism is the changing of rocks by heat and pressure. During this process, rocks change either physically and/or chemically. They change so much that they become an entirely new rock. Figure 4.22: The platy layers in this large outcrop of metamorphic rock show the effects of pressure on rocks during metamorphism.

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3 years ago

sam drove 44 meters to the right . she drove 13 meter to the left . what was her displacement ? what is displacement ?

GuDViN [60]

The displacement was 31

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3 years ago

A conducting sphere with neutral charge is connected to the ground. A positively charged rod is moved near the sphere. While the

statuscvo [17]

Answer:

A negative

when the charged rod is brought closer to the sphere negative charges get induced on the surface of the sphere by gathering some electrons from the ground and the negative charges reamain on the sphere even after disconnecting it. here the ground acts as a reservoir of electrons.

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3 years ago

You drop a stone into a deep well and hear it hit the bottom 6.65 s later. This is the time it takes for the stone to fall to th

baherus [9]

Answer: ok, so total time is Tt = 6.65 seconds = time falling + time of sound traveling.

the time of the rock falling is given by: $(g/2)*t₀^{2} -h = 0$ (1)

where h is the heigth of the hole, and t₀ is the time it took to reach the bottom.

the time of the sound traveling is given by 343*t₁ - h = 0 (2)

so t₁ + t₀ = 6.65s = total time

then you know that t₁ = 6.65s - t₀

so now you have two variables, t₀ and h, and we want to know the value of h, so we want to write t₀ as a function of h.

in the second equation we have now: 343*(6.65 - t₀) = h

so t₀ = (-h/343 + 6.65)s

replacing this on the first equation you have:

$(g/2)*(-h/343 + 6.65)^{2} -h = 0$

now you want to take h to the right side so

so if we replace g by 9.8 meters over seconds square we get

h = $\frac{-1.19 -+ \sqrt[2]{1.56} }{2*0.00041}$

where you will take the positive root

h = 61 meters

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4 years ago