4 10 points A wheel on a truck with radius 18 inches is turn

4 (10 points) A wheel on a truck with radius 18 inches is turning\" 12 mliwpr-Vu, the speed of the truck in mph? (assume I mile 5280 18 inches is turning at 12o 5.(10 points) A man at ground level views the top ofa building atmkofer Ahrn. straight line towards the building at the same altitude fr 500 ft, the man views pcftie haling an angle of 59°. How tall is the building? akhien

Solution

Here circumference is the distance covered by wheet in its one revolution.

So total distance in one revolution = 2 x \\pi x radius = 2 x 3.14 x 18 = 113.04

So total distance covered in 1 second = 113.04 x 12 = 1356.48 iinch

now as 1 inch = 0.0000157828 miles

So 1356.48 inch = 1356.48 x 0.0000157828 = 0.0214 miles

Futher 1 second = 0.00028 hours

So required speed in mph = 0.0214/0.00028

= 77.04 miles per hour.

That is our last answer.