(a) The elevator accelerates upward from rest at a rate of 1.7 for 1.6 s. s2 (i) Newton's Second Law in the y-direction can be written as T= 1 EF,=-1 meg+ 1 •m¸a (ii) Calculate the tension in the cable supporting the elevator. T= 19567 XN (iii) How high has the elevator moved during this time? Ay= (iv) Calculate the velocity of the elevator after this time. m v(t=1.6 s) = %3D S

Two carts, A and B, roll on inclined planes with negligible friction. Cart A has a mass of 1.3 kg and it is on a plane inclined at an angle of ? θ ? θ = 63 degrees. Cart B has a mass of 2.5 kg and it is on a plane inclined at an angle of ? ϕ ? ϕ = 14 degrees. The carts are connected by a (nearly) massless string that runs over a (nearly) massless and frictionless pulley. Find the tension (in newtons) in the string.

You are in charge of a cannon that exerts a force 17100 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.37 m and the cannon is aimed at a 36.7 ◦ angle from the ground. The acceleration of gravity is 9.8 m/s 2 . If you want the ball to leave the cannon with speed v0 = 89 m/s, what mass cannon ball must you use? Answer in units of kg. Answer in units of kg.

In the figure here, block 1 of mass 2.2 kg and block 2 of mass 3.4 kg are connected by a string of negligible mass and are initially held in place. Block 2 is on a frictionless surface tilted at 0 = 23 °. The coefficient of kinetic friction between block 1 and the horizontal surface is 0.25. The pulley has negligible mass and friction. Once they are released, the blocks move. What then is the tension in the string? Number i Unit