An airplane is towing a glider to altitude. The tow rope is 20° below the horizontal and has a tension
force of 300 lb exerted on it by the airplane. Find the horizontal drag of the glider and the amount of lift
that the rope is providing to the glider. Sin 20° = 0.342; cos 20 °= 0.940. - Answers Drag:
Cos 20° = D/T (Rearrange) D = Cos 20° X Tension
D = 0.940 X 300lbs
D = 282lbs
Lift:
Sin 20° = L/T (Rearrange) Lift = Sin 20° X Tension
Lift = 0.342 X 300 lbs
Lift = 102.6 lbs
A jet airplane is climbing at a constant airspeed in no ‐wind conditions. The plane is directly over a point
on the ground that is 4 statute miles from the takeoff point and the altimeter reads 15,840 ft. Find the
tangent of the plane's climb angle and the distance that it has flown through the air. - Answers Find the
tangent of the plane's climb angle:
Convert Altitude Into Miles: 15,840 ft / 5280ft = 3sm
Tan = Height / Distance
, Tan = 3sm / 4sm
Tan = 0.75
Find the Distance that it has flown through the air:
Da = √ Distance² + Height²
Da = √ 4sm² + 3sm²
Da = √ 4 x 4 + 3 x 3
Da = √ 25sm
Da = 5sm
Find the distance (S) and the force (F) on the seesaw fulcrum shown in the figure. Assume that the
system is in equilibrium. - Answers For the system to be in equilibrium, the moments on the left and
right of the fulcrum must be equal.
Find the Distance:
Moment = Force (W) X Distance
Weight 1 X S = Weight 2 X (Distance - S)