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2 years ago

9

Jane slowly paddles her canoe across a calm lake. Explain what makes the boat moves forward. What principle best explains this s

ituation?

1 answer:

nalin [4]2 years ago

7 0

Janes paddles push on the water and the water pushes back on janes paddles.

Newtons 3. Law: Action = -Reaction

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a bends each wavelength of white light slightly differently so that each wavelength color comes out separated forming a rainbow

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2 years ago

Projectile motion in two dimensions cannot be determined by breaking the problem into two connected one-dimensional problems.

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2 years ago

Find the dimension of density

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Density = Mass divided by Volume

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3 years ago

If a block of wood dropped from a tall building has attained a velocity of 78.4 m/s how long has it been falling

ryzh [129]

Gravity adds 9.8 m/s to the speed of a falling object every second.

An object dropped from 'rest' (v = 0) reaches the speed of 78.4 m/s after falling for (78.4 / 9.8) = <em>8.0 seconds</em> .

<u>Note:</u>

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3 years ago

When the displacement in SHM is equal to 1/3 of the amplitude xm, what fraction of the total energy is (a) kinetic energy and (b

Nesterboy [21]

Answer:

Explanation:

Given

Displacement is $\frac{1}{3}$ of Amplitude

i.e. $x=\frac{A}{3}$ , where A is maximum amplitude

Potential Energy is given by

$U=\frac{1}{2}kx^2$

$U=\frac{1}{2}k(\frac{A}{3})^2$

$U=\frac{1}{18}kA^2$

Total Energy of SHM is given by

$T.E.=\frac{1}{2}kA^2$

Total Energy=kinetic Energy+Potential Energy

$K.E.=\frac{1}{2}kA^2 -\frac{1}{18}kA^2$

$K.E.=\frac{8}{18}kA^2$

Potential Energy is $\frac{1}{8}$ th of Total Energy

Kinetic Energy is $\frac{8}{9}$ of Total Energy

(c)Kinetic Energy is $0.5\times \frac{1}{2}kA^2$

$P.E.=\frac{1}{4}kA^2$

$\frac{1}{2}kx^2=\frac{1}{4}kA^2$

$x=\frac{A}{\sqrt{2}}$

7 0

3 years ago

Read 2 more answers