John Logie Baird gave the first demonstration of a colour television transmission on July 3rd, 1928. The leading pioneer in the creation of television, John Logie Baird, was a Scotsman, born in 1888, the son of a Presbyterian minister, and educated in Glasgow. An electrical engineer and an eccentric genius, he was no businessman, his health was precarious and after a time spent marketing socks, jam and soap he suffered a nervous breakdown.
A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth (1â60) of one degree. As one degree is 1â360 of a circle, one minute of arc is 1â21600 of a circle (or, in radians, Ïâ10800). It is used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying and marksmanship.
(a) Give the angular velocity in rad/sec and in degrees per second. (b) Find the linear velocity of a point on its rim in mph. Solution. (a) To convert rpm (revolutions per minute) to radians per second, we first note that there are 2! radians per revolution.b) Find the linear speed on the rim in mph. 2. If a cylinder with a 6 in. radius is spinning at 24 mph, find the angular velocity in rpm of a point on its rim. 3. (a) What is the radius of the circle at 28 ! 15 !