Question

9. A 25 kg block is at rest on a horizontal surface. A 100 N force is applied at an angle of 30° above the horizontal. The coefficients of friction are us = 0.6 and Hk = 0.5 What is the acceleration of the block while the force is being applied? F = 100 N 30° HA=0. 6 25 kg = 0.5 5. A toy car goes down a track with a loop. The loop has a radius of 0.1m. What is the minimum speed of the car at the top of the loop so that the car will not leave the track? (ignore the size of the car.) V top = ? R=0.1 m

please answer both questions please

Answer 1

fra Balancing vertical forces we get N + Fsino = mg Meng-Fsino. = 250 - 50 - 200N. f static - Ms N = 1200. Horizontal force = Froso = = 100 cos 3 0= 503 which is leas than friction. therefore acceleration = 0.

10) 7 muel Hing at top car will have 2 forces weight and centrifugal. Balancing both we get for min velocity mv² = mg. v trg - Jo.ix. 10 = 1 m/s.