What does E=MC5, do you think einstein was correct or wrong,

Answers

Answer 1

Answer: Einstein's famous equation has a 2 in it, not a 5. It makes no difference what you, I, or anyone else 'thinks'. That equation has been proven correct in hundreds of experiments and thousands of observations and measurements since it was published. Among other things, it happens to be the reason why the sun shines.

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What could you do to change the volume of a gas?

Answers

People are going to tell you about heating or cooling the gas, but
there's only one way to change the volume of a gas: Put it into a
different container !

A gas always expands to fill whatever you keep it in ... doesn't matter
how warm or cold it is. So the only way to make it change its volume
is to put it into a larger or smaller jar.

Heat it up to make it expand, or cool it down to make it contract. When you heat a gas, the particles of the gas get farther apart, therefore making the gas expand. The opposite happens when you make it colder.

A 0.15-kg ball is thrown into the air and rises to a height of 20.0 m. How much kinetic energy did the ball initially have?

Answers

IF the toss was straight upward, then the kinetic energy it got
from the toss is the gravitational potential energy it has at the top,
where it stops rising and starts falling.

Potential energy = (mass) x   (gravity) x (height)

   = (0.15 kg) x (9.8 m/s²) x (20 m)

   = 29.4 kg-m²/s² = 29.4 joules .

The conservation of energy says that energy in an isolated system remains constant, that it is not created nor destroyed but transforms from one form of energy to another.
So when the ball is thrown into the air, it has kinetic energy (KE). As it goes into the air, that kinetic energy transforms into gravitational potential energy (GPE). The higher it gets, the more GPE it has and therefore the less KE it has.
At the top, all of it is transformed into GPE and there is no KE.
But total energy at any point after the ball is thrown until it lands it has the same energy throughout.

Knowing this, you can set the beginning KE equal to the final GPE.
KE = GPE

Insert formula for GPE.

KE = mgh
KE = 0.15kg*9.8m/s^2*20.0m
KE = 29 J

The ball initially had 29 J of kinetic energy

Volume of a Cube The volume V of a cube with sides of length x in. is changing with respect to time. At a certain instant of time, the sides of the cube are 7 in. long and increasing at the rate of 0.2 in./s. How fast is the volume of the cube changing (in cu in/s) at that instant of time?

Answers

The volume of the cube is changing at the rate of 29.4 in³/s.

Time derivative:

The rate of change of the sides of the cube is 0.2 in/s, which can be mathematically represented as :

$(dx)/(dt)=0.2 \;in/s$

Now the volume of the cube is given by:

V = x³

If we take the time derivative of the above equation then it gives the rate of change of volume with time, so:

$(dV)/(dt)= (d)/(dt)x^3\n\n (dV)/(dt)= 3x^2(dx)/(dt)$

At the instant x = 7 in, the rate of change of volume will be:

$(dV)/(dt)= 3*7^2*0.2\;in^3/s\n\n(dV)/(dt)=29.4\;in^3/s$

So the volume is changing at 29.4 cubic inches per second.

Learn more about differential equation:

brainly.com/question/25731911?referrer=searchResults

Answer:

Therefore the volume of cube is change at the 29.4 cube in./s at that instant time.

Explanation:

Formula

$(dx^n)/(dx) =nx^(n-1)$

Cube :

The volume of a cube is = $side^3$

The side of length is x in.

Then volume of the cube is (V) = $x^3$

∴ V = $x^3$

Differentiate with respect to t

$(d)/(dt)(V)=(d)/(dt) (x^3)$

$\Rightarrow (dV)/(dt) =3x^2(dx)/(dt)$ ....(1)

Given that the side of the cube is increasing at the rate of 0.2 in/s.

i.e $(dx)/(dt) = 0.2$ in/s.

And the sides of the cube are 7 in i.e x= 7 in

Putting $(dx)/(dt) = 0.2$ and x= 7 in equation (1)

$\therefore (dV)/(dt) =3 * 7^2 * 0.2$ cube in./s

=29.4 cube in./s

Therefore the volume of cube is change at the 29.4 cube in./s at that instant time.

What is the advantage of designing a thermos so that it has a vacuum layer surrounding the area where hot liquids are stored?

Answers

The vacuum layer will prevent heat losses due to conduction and convection completely as it will provide no medium for these phenomena.

Answer:

insulator

Explanation:

Which of the following is an example of diffraction? A. Hearing a band play through an open doorway without seeing them. B. Sitting in a room and watching a band play. C. Playing in a band. D. None of these examples show diffraction.

Answers

A because diffraction is the bending of waves around small obstacles or openings. That’s why you can hear a band through an open doorway without seeing them

A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

Answers

Force x speed = power
200 x 2 = 400 watts

Answer:

Explanation:

Power = work/time

Work = force x distance

power = force X distance/time (velocity)

power = 200N x 2m/s

power = 400 joules

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