the perimeter of a rectangular feild is 440m. the ratio of its lentgh to width is 7:4 find the area of the feild

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Ответ:

marahdgz

26.11.2020

Mathematics

30.1 m/s

Step-by-step explanation:

For a point in uniform circular motion, the relationship between angular speed and linear speed is given by

$v=\omega r$

where

v is the linear speed

$\omega$ is the angular speed

r is the distance of the point from the axis of rotation

In this problem, we have:

$\omega=4800 rpm$ is the angular speed, in revolutions/minute

Converting into radians per second,

$\omega=4800 \frac{rev}{min}\cdot \frac{2\pi rad/rev}{60 s/min}=502.4 rad/s$

The diameter of the CD is

d = 120 mm

So the radius is

r = 60 mm = 0.06 m

Therefore, a point at the outer edge of the disc has a distance of

r = 0.06 m from the axis.

Therefore, its linear speed is:

$v=\omega r=(502.4)(0.06)=30.1 m/s$

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