Amodel airplane of mass 0.765kg is flying at constant speed in a horizontal circle at one end of a 33.5 m cord, and at a height of 17.6m. the other end of the cord is fixed to a point on the ground. the airplane makes 4.50 revolutions per minute and the lift is perpendicular to the unbanked wings. (a) what is the acceleration of the plane? (b) what is the tension in the cord? (c) what is the lift produced by the plane's wings? 2. a 253 n trunk lies at rest on the floor. the coefficient of static friction between the trunk and the floor is 0.412, while the coefficient of kinetic friction is 0.324. (a) what is the minimum horizontal force with which a person must push on the trunk to start it moving? (b) once moving, what horizontal force must the person apply to keep the trunk moving with constant velocity? (c) if, instead, the person continued to push with the force used to start the motion, what would be the acceleration of the trunk? 3. a 4.45 kg box on a 35.0° inclined plane is acted upon by a horizontal force of 47.2 n (see figure 3 from p. s #3) the coefficient of kinetic friction between the box and the plane is 0.335. (a) what is the acceleration of the box if it is moving up the inclined plane? (b) with the horizontal force still acting, how far up the plane will the box go if it has an nitial upward speed of 4.30 m/s? (c) what happens to the box after it reaches the highest point?