If the cord has a stiffness k = 30 N/m and an unstretched length of 0.25 m, determine the force of the guide on the particle when θ=60°

ชื่อ

ID

การบาน

Mechanics I, section 4 (

สงจันทรที่

30

ส.ค.

2553

ในชั่วโมงเรียน)

Airplane A is flying horizontally with a constant speed of 200 km/h and is towing the glider B, which is gaining altitude. If the tow cable has a length r =60 m and θ is increasing at the constant rate of 5 degree per second, determine the magnitudes of the velocity v and acceleration a of the glider for the instant when θ=15° (J.L.Meriam and L.G.Kraige, Engineering Mechanics Dynamics 5^th edition, Prob. 2-199)

ชื่อ

ID

การบาน

Mechanics I, section 4 (

สงจันทรที่

30

ส.ค.

2553

ในชั่วโมงเรียน)

The smooth particle has a mass of 80 g. It is attached to an elastic cord extending from O to P and due to the slotted arm guide moves along the horizontal circular path

) sin 8 . 0

( θ

=

r m. If the cord has a stiffness k = 30 N/m and an unstretched length of 0.25 m, determine the force of the guide on the particle when θ=60°. The guide has a constant angular velocity θ& =5 rad/s. (R.C. Hibbeler, Engineering Mechanics Dynamics 11^th edition, Prob.13-97)