Question

find the average vilocity when a person complete a full round around a circlular ground of radius 70metere in 88seconds.
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Answer 1

A man running around a circular track of radius 20m covers one complete round in 40s. calculate the distance and displacement covered by him in 3minutes. (please answer with full explanation) very urgent

2

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Answers



THE BRAINLIEST ANSWER!



Kmg13teen

Expert

Distance in circular motion = Circumference of the circle

As we know, circumference of the circle is denoted by

 

Distance=

 2 ×  × 20

 

             = 125.7 metre

This means he completed one round in 40 seconds. Thus, he takes 40 seconds to complete one round

Now for 3 minutes= 180 seconds

now taking the ratio,



Thus,

                 



Thus

x=565.7

Thus he covered a distance of 565.7 metre in 3 minutes

for displacement let's divide the covered distance by circumference

=565.7/125.7

=4.500

Now converting this in words

this means he has completed 4 rounds and have completed 1/2 round extra, he is on a point parallel to his starting point

thus he is not on his starting position, thus his displacement is not zero. Drawing a line from starting position to his current position, it will pass through the centre, it is the diameter

Displacement= 2×20

                     = 40m

ANS Distance covered in 3 minutes is 565.7 m and displacement is 40m

Answer 2

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s[Note 3]). It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1⁄299792458 second.[Note 4][3] According to special relativity, c is the upper limit for the speed at which conventional matter and information can travel. Though this speed is most commonly associated with light, it is also the speed at which all massless particles and field perturbations travel in vacuum, including electromagnetic radiation and gravitational waves. Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. Particles with nonzero rest mass can approach c, but can never actually reach it. In the special and general theories of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.[