1. A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0", and the man pulls upward with a force .F whose direction makes an angle of 30.0 with the ramp (Figure 4.9). a) How large a force .F is necessary for the component Ft parallel to the ramp to be 43.3N'.' b} How large will the component F). perpendicular to the ramp then be? 2. A sled is tied to a tree on a frictionless, snow-covered hill, as shown in the second figure in the right. If the sled weighs 80 N, nd the a) force exerted by the rope on the sled: and the b} normal force exerted by the hill on the sled. 3. An athlete whose mass is 90.0 kg is performing weightlifting exercises. Starting from the rest position. he lifts, with constant acceleration, a barbell that weighs 490 N. He lifts the barbell a distance of 0.60 m in 1.6 5. Find the total force that his feet exert on the ground as he lifts the barbell. 4. In a physics lab experiment, a 6.0Elkg box is pushed across a flat table by a horizontal force. a) If the box is moving at constant speed of 0.350 mfs and the coefcient of kinetic friction is 0.12I what is the magnitude of the force? b} What is the magnitude of the force if the box is speeding up with a constant acceleration of 0.130rn/s2? 5. A block of m1=20.0 kg is placed an a plane incline at angle a=3?.l and is connected to a second hanging block with mass m; by a cord passing over a small, frictionless pulley. The coefcient of kinetic friction between the plane and the block is 0.30. a) Find the mass rn; if it is to descend 12.0 m in the first 3.00 s after the system is released from rest. b) Find the mass m; for which the block m1 accelerate down the plane at a rate same as the magnitude in {a}. 6. A small car with mass of 0.800 kg travels at a constant speed on the inside ofa track that is a vertical circle with radius 5.00 rn. 1f the normal force exerted by the track on the car when it is at the bottom of the track is 25 N, a) What is the normal force on the car when it is at the (F) top, (if) rightmost and (iii) leftmost point of the track? b} What is the speed of the car as it travels around the vertical circle