Oct9B_day10_REVIEW.notebook
October 09, 2012
Check for Understanding
a) Determine the avg speed from t = 5s to t = 7s
b) Determine the
total displacement
and the distance
traveled in 7 s.
c) SKETCH the motion map (dot diagram) for
the entire 7 seconds of travel
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A shell is fired with a horizontal velocity in the positive X direction from the top of an 80m high cliff. The shell strikes the ground 1330m from the base of the cliff. (SHOW all work!)
a) Determine the initial speed vi of the shell
b) What is the speed of the shell as it hits the ground
c) What is the magnitude of the acceleration of the shell just before it strikes the ground?
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HORIZONTAL VERTICAL
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2. Tom the cat is chasing Jerry the mouse across a table surface 1.5m high. Jerry steps out of the way at the last second and Tom slides off the edge of the table at a speed of 5m/s. A) Where does Tom strike the floor? B) What are his vertical and horizontal velocity components just BEFORE he hits the floor?
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3. A lacrosse player slings the ball at an angle of 30o above the horizontal with a speed of 20 m/s. How far away should a teammate position herself to catch the ball at the same height as it is released?
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4. A ball is thrown straight upward and returns to the thrower's hand after 3 seconds in the air. A second ball is thrown at an angle of 30o with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
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