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Radda [10]
3 years ago
11

What is the value of x in the equation Ix - 3y = 30, when y = 15?

Physics
1 answer:
ankoles [38]3 years ago
8 0

Answer: x= 75

Explanation:1x -3y = 30

And y = 15

Substitute y accordingly into the equation, so that

x - 3(15) = 30

x-45=30

Add 45 to both sides if the equation

x-45+45=30+45

x=75

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Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y is released from rest from the s
frosja888 [35]

Answer:

C) True. S increases with time, v₁ = gt and v₂ = g (t-t₀)  we see that for the same t v₁> v₂

Explanation:

You have several statements and we must select which ones are correct. The best way to do this is to raise the problem.

Let's use the vertical launch equation. The positive sign because they indicate that the felt downward is taken as an opponent.

Stone 1

    y₁ = v₀₁ t + ½ g t²

    y₁ = 0 + ½ g t²

Rock2

It comes out a little later, let's say a second later, we can use the same stopwatch

     t ’= (t-t₀)

    y₂ = v₀₂ t ’+ ½ g t’²

    y₂ = 0 + ½ g (t-t₀)²

    y₂ = + ½ g (t-t₀)²

Let's calculate the distance between the two rocks, it should be clear that this equation is valid only for t> = to

    S = y₁ -y₂

    S = ½ g t²– ½ g (t-t₀)²

    S = ½ g [t² - (t²- 2 t to + to²)]  

    S = ½ g (2 t t₀ - t₀²)

    S = ½ g t₀ (2 t -t₀)

This is the separation of the two bodies as time passes, the amount outside the Parentheses is constant.

For t <to.  The rock y has not left and the distance increases

For t> = to.  the ratio (2t/to-1)> 1 therefore the distance increases as time

passes

Now we can analyze the different statements

A) false. The difference in height increases over time

B) False S increases

C) Certain s increases with time, v₁ = gt and V₂ = g (t-t₀) we see that for the same t   v₁> v₂

3 0
3 years ago
A machine has an efficiency of 70%. How much work dose the machine do when 20,000 J of work is done on it ?
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Answer: The machine does 14.000 J

3 0
3 years ago
A man climbs on to a wall that is 3.6m high and gains 2268J of potential energy. What is the mass of the man? *
Ilia_Sergeevich [38]
The mass of the man is 63 kilograms
There is it written down properly. Its hard to type this stuff in here

3 0
3 years ago
when a cup of hot chocolate cools from 90c to 80c which of the following is happening to the molecules of the liquid
Murljashka [212]

Answer:

I think that the liquids molecules are slowing down. Hope this helps!

Explanation:

Please vote me Brainliest

7 0
3 years ago
Is there gravitational force between two students sitting in a classroom?
drek231 [11]

Answer:

Yes.

Explanation: the magnitude of the force is extremely small because the masses of the students are small relative to Earth's mass.

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