2/59 At time t = 10 s, the velocity of a particle moving in the x-y plane is v= 0.1i + 2j m/s. By time = 10.1 s, its velocity has become -0.1i + 1.8j m/s. Determine the magnitude aay of its average acceleration during this interval and the angle made by the average accel- eration with the positive x-axis.

From the following identify the true statement. OIn general safety precaution, the operator should know the procedure to switch OFF the power and lock it in position. O In housekeeping safety precaution, compressed air should not be used to clean the machine. O In electrical safety precaution, all non- metallic parts externally accessible must always be earthed. O In general safety precaution, the inflammable materials need not be kept near to electrical controls

A flywheel rotates with a uniform speed of 112rpm for 5.7 seconds .Then it is uniformly accelerated at 0.3rad/s2 for next 7.1 s. then it is made to stop in next 5.4s. Determine (i)maximum angular velocity; (ii) total angular displacement 1.The angular displacement in rad θ1 = 2.The angular displacement in rad θ2 = 3.The maximum velocty in rad/s  ω2= 4.The initial velocity in third case in rad/s  ω03= 5.The angular displacement in third case in rad θ3= 6.The total displacement in rad θ=

The velocity of a particle moving in the x-y plane is given by (5.72i + 7.27j) m/s at time t = 5.22 s. Its average acceleration during the next 0.019 s is (3.1i + 8.0j) m/s2. Determine the velocity v of the particle at t = 5.239 s and the angle e between the average- acceleration vector and the velocity vector at t = 5.239 s. Answers: i i+ i j) m/s i