Abody covers a semicircle of radius 7cm in 5s .find its linear speed

Ok so we are given the radius of 7cm and time of 5 seconds.

From the data we got we can calculate speed, frequency, perimeter and area of the semicircle.

Let's start with perimeter.

We know that perimeter of circle is so the perimeter of semicircle is or simply

So the perimeter is equal to:

So this is the length of a curve or let's say the distance.

Now let's look at the linear speed where d is distance and t time.

We know the distance and we know the time.

So let's calculate it.

Hope this helps.

r3t40

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles