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GOLIGHTLY.SUM03.MT1

# GOLIGHTLY.SUM03.MT1 - F RON FAX N O Ju 15 2AA3 A6:55HN Pl...

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FRON : FAX NO. : Ju]. 15 2AA3 A6:55HN Pl Physics 8A Summer 2003 Midterm I I, (15 pts) A man exerts a steady force of 25.0 N on a block of mass 2.0 kg as he pushes it up a 30o incline. The incline is 15.0 m long. Theblock stafis out stationary at the bottom of the incline, which is on the ground. (a) What is the speed of the block when it reaches the top of the incline? Assume the surface is frictionless. (b) Once the block reaches the top, the man letsgo of it and allows it to travel freely through the air until it hits the ground. How much total time does the object spend on its trip (i.e, the time from when it starts at the bottom of the inclineuntil it lands on the ground)? 2. (10 pts)A man walks 5.0 kph (kilometers per hour) for 10.0 minutes at 30o north of east, then 3.0kph for 15.0 minutes at 20o east of south. Findtheaverage velocity (magnitude and direction) for the trip. 3. (10 pts) In the diagr^m, mt = 3.0 kg and mr= 4.0 kg. The block m, is falling with an acceleration of 1.60 m/s?. Find the coefficient of kinetic friction berween theblocknr, and

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