A model airplane of mass 1
.
5 kg is attached
to a horizontal string and flies in a horizontal
circle of radius 6
.
8 m, making 1
.
6 revolutions
every 4 s. (The weight of the plane is balanced
by the upward “lift” force of the air on the
wings of the plane.)
The accelaration due to the gravity is 9.81
m/s
2
.
Find the speed of the plane.

Question

A model airplane of mass 1
.
5 kg is attached
to a horizontal string and flies in a horizontal
circle of radius 6
.
8 m, making 1
.
6 revolutions
every 4 s. (The weight of the plane is balanced
by the upward “lift” force of the air on the
wings of the plane.)
The accelaration due to the gravity is 9.81
m/s
2
.
Find the speed of the plane.

jack1 · Answer

do you think he means angular velocity or 
"if the string suddenly snapped, what would it's straight line velocity be" @yrelhan4 ?

yrelhan4 · Answer

i think he means regular velocity..

yrelhan4 · Answer

i meant the angular velocity..

yrelhan4 · Answer

so what you gotta do here is..
find the circumference=2pi*r.. thats the total distance..
and then find the time taken to complete one revolution. 6 revolutions in 4seconds.. so 1 revolution in 2/3seconds..
speed=distance/time will give you the answer..