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4 years ago

I NEED HELP FAST PLEASE!!!! 30 POINTS!!!!

Physics

1 answer:

svetlana [45]4 years ago

4 0

Certain conditions do make one better than the other and there is no clear winner

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What is the english system of measurement called?

Artemon [7]

The answer is imperial units

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3 years ago

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii and are of uniform density. If the three are r

scZoUnD [109]

Answer:

A ) SOLID SPHERE

Explanation:

Moment of inertia of solid sphere = 2/5 M R²

= M K² , K is called radius of gyration

K = √2/5 R

Moment of inertia of solid cylinder = 1/2 M R²

= M K² , K is called radius of gyration

K = 1 /√2 R

Moment of inertia of solid sphere = M R²

= M K² , K is called radius of gyration

K = R

For rolling on inclined plane , acceleration

a = $\frac{gsin\theta}{1+\frac{K^2}{R^2} }$

Putting the value of K for solid sphere

a for solid sphere

a = g sinθ / ( 1 +2/5)

a = .714 g sinθ

Putting the value of K for solid cylinder

a for solid cylinder

a = g sinθ / ( 1 +1/2)

a = .666 g sinθ

Putting the value of K for hollow pipe

a for hollow pipe

a = g sinθ / ( 1 +1 )

a = . 5 g sinθ

So we see that acceleration a for solid sphere is greatest and a for hollow pipe is the least. Hence solid sphere will reach the bottom earliest and hollow pipe will reach the bottom the latest.

7 0

3 years ago

What conversion takes place in a motor?

LenaWriter [7]

C should be the right answer! hopefully this helps!

4 0

3 years ago

3. Calculate the wavelength of wave that has a frequency of 4.75 x 1012Hz.

Klio2033 [76]

Frequency=v=4.75×10^12Hz
Wavelength=?

We know

$\boxed{\sf \lambda=\dfrac{C}{V}}$

$\\ \sf\longmapsto \lambda=\dfrac{3\times 10^8ms^{-1}}{4.75\times 10^{12}s^{-1}}$

$\\ \sf\longmapsto \lambda=0.631\times 10^{-4}m$

$\\ \sf\longmapsto \lambda=6.31\times 10^{-5}m$

4 0

3 years ago

Two forces, 80N and 100N acting at an angle of 60 degrees with each other, pull on an object. What single force would replace th

KIM [24]

We use the law of Cosines, resultant force

$F =\sqrt{(F_{1})^2 + (F_{2})^2 + 2 F_{1} F_{2} cos \theta }$

Here, $(F_{1})$ and $(F_{2})$ are forces acting at angle $\theta$ with each other.

Given $F_{1} = 80 N$ , $F_{2} = 100 N$ and $\theta = 60^0$ .

Substituting these given values in above formula we get

$F =\sqrt{(80)^2 + (100)^2 + 2 \times 80 \times 100 \ cos 60^0 } = 156. 20 \ N$ .

Thus, the resultant force is 156 N.

8 0

4 years ago