3 years ago

Which of the following is a physical change?

Physics

1 answer:

ella [17]3 years ago

4 0

All of these are chemical changes except evaporation.

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29.8 %

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3 years ago

Lukalu is rappelling off a cliff. The parametric equations that describe her horizontal and vertical position as a function of t

andre [41]

Answer:

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Explanation:

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$x(t) = 8t\\y(t) = -16t^2 + 100$

we can find the time it takes her to reach the ground by requiring that the vertical position becomes zero:

y(t) = 0

So we find:

$0=-16t^2 +100\\16t^2 = 100\\t=\sqrt{\frac{100}{16}}=2.5 s$

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3 years ago

Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla. Justify y

sleet_krkn [62]

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I will explain the concept of magnetic field and how it can be calculated.

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The formula for magnetic field at the center of a loop is given as

B = μ $_{o}$ I / 2R

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and μ $_{o}$ is the magnetic permeability of free space which is a constant 4π × $10^{-7}$ newtons/ampere²

If the magnetic field at the center of the loop is 0, then μ $_{o}$ I = 0

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4 years ago