Question

is attached to a string and rotated in a vertical circle of radius 04 m with constant speed of 12 m/s. Calculate the tension of the bottom of the circle. string at the top and the (b) Moon is revolving around the earth once every 28 days. Determine its angular speed in rad/s. O If the distance between earth and the moon is 3.8 x 10 m, determine the mass of the earth. 6. A 0.2 kg ball is sliding along a smooth path Shown in the diagram. If its kinetic energy is 4 J at A, determine (a) its kinetic energy at B. 4 m (b) its speed at C. A uniform ladder of weight 200 N and length 4m is placed against a smooth vertical wall making an angle of 30° with the horizontal. If the ladder is in state of equilibrium determine the friction force acting on the ladder at its lower end 7. Tom Sawyer builds a raft out of solid wood of density of 650 kg/m3 and launch it on fresh water. The raft is 3 m long 2 m wide and 0.2 m high. a. While floating in water, determine the distance between the top of the raft and the water surface. 8. b. In order to test the raft, Tom starts loading his friends onto it. How many 50 kg kids could Tom's raft support without sinking completely? 9. A ball A of mass 200 grams moving horizontaly with speed of 20 m/s collides with an identical marble B of mass 150 grams moving in opposite direction with speed 10 m/s After the collision the first marble(A) moves in a direction 60P left of its original direction and second marble(B) moves 30 degrees right of original direction of A. Determine speeds of marbles after the collision. 10. Starting from rest, a car accelerates 20 sec at 1m/s?. . Then the driver applies brake and the car decelerates at rate of 8 m/s until it comes to stop. Determine the total time it was in motion and total distance it traveled during this time.

Answer 1

SoP 5) a)Tensiom ot top top b) 28X24x3600 C) 6.67 X10 Mc -2.12 x1028 kq