2 years ago

Please help with these questions

Physics

1 answer:

lord [1]2 years ago

8 0

When do you gotta turn it in?

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It is necessary to develop alternative sources of energy because _____.

Leona [35]

Because we wish to have a sustainable future. The current dependence on fossil fuel means that there will be a point when humans have no fuel to use because fossil fuels are a non-renewable resource.

3 0

4 years ago

A potter's wheel is rotating around a vertical axis through its center at a frequency of 2.0 rev/s. The wheel can be considered

mart [117]

Answer:

$\omega_f=12.2954 \,rad.s^{-1}$ i.e.

$Frequency=1.9569\,rev.s^{-1}$

Explanation:

Given:

angular speed, $\omega_i =2\times 2\pi \,rad.s^{-1}$

mass of the disk, $M=4.9\,kg$

radius of the disk, $R=0.2\,m$

mass of the chunk, $m=2.7\,kg$

radius of the chunk, $r=0.04\,m$

We know that the angular momentum is given by:

$L=I.\omega$

and moment of inertia for a disc:

$I=\frac{1}{2} m.r^2$

According to the conservation of angular momentum, the final angular momentum is equal to the initial angular momentum.

$\frac{1}{2} \times M.R^2\times \omega= \frac{1}{2} \times (M.R^2+m.r^2) \omega_f$

$4.9\times 0.2^2\times (2\times 2\pi)=(4.9\times 0.2^2+2.7\times 0.04^2 )\tiems \omega_f$

$\omega_f=12.2954 \,rad.s^{-1}$

$Frequency=1.9569\,rev.s^{-1}$

4 0

4 years ago

The potential energy of an apple is 19.6 J, and it is 8 m above the ground. The mass of the apple is _____ kg

Crazy boy [7]

We know, U = mgh
Substitute the known values,
19.6 = m * 9.8 * 8
m = 19.6 / 78.4
m = 1/4

In short, Your Answer would be 1/4 Kg

Hope this helps!

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3 years ago

What effects would you expect if red blood cells were shaped like neurons

vivado [14]

A trippy asssssss body..........

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3 years ago

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Please help me please

olasank [31]

Answer:

That is true. *True

Explanation:

Have a nice night.

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3 years ago