Question

Lab 10: Pre-labs This pre-lab is worth 30 points of your final grade. Show your work to get full credit. Each problem is worth 5 points. Problem 1: The angular velocity of flywheel decreases uniformly from 12000rev/min to 3000 rev/min in 8 sec. Find the angular acceleration and the number of revolutions made by the wheel in the 8 sec interval. How many more seconds are required for the wheel to come to rest? Problem 2: A uniform meter scale supported at the 40 cm mark is in equilibrium when a 50g mass is suspended at the 10 cm mark of the scale. Find the mass of the scale. Problem 3: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. if the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta) 1/20 where theta is the angle of the incline to the horizontal. Problem 4: An airplane pilot wishes to fly due north. A wind 30 km/hr is blowing towards the west. If the flying speed of the plane is 360km/hr. In what direction should the pilot set his course? What is the speed of the plane over the ground? Problem 5: A bullet of mass 10 g is fired vertically with a velocity of 100 m/s into a block of wood of mass 190g suspended by a long string above the gun. If the bullet comes to rest in the block, through what height does the block move? Problem : A ball of mass 0.2kg falls from a height of 45 m. On striking the ground it rebounds in 0.1s with two- thirds of the velocity with which it struck the ground. Calculate (i) the momentum change on hitting the ground (1) the force on the ball due to impact.

Answer 1

Pauer (3) F. V = G00) 20) 4000 Wott Pawer cod) 200 Wat 50k C40 10) Sat 30 = tems 1 Lmon me Sale 2 V219845 29-7 0 hiv-u) 4512(1-7)- (-29.7) 45t 5 29-7 2227-38 19s (li) FAp 222 38 h2273.N Dt I

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