Show conversions and all work including unit conversions if possible

Questions 1, 2, 3 = 25 Fg Each
Multiple Choice Questions - 5 Fg Each, (4, 5, 6)

1.Greg is pushing two blocks (Ma = 18 kg and Mb = 14kg) horizontally across a floor with a force of 85N as illustrated. The blocks are speeding up as they move to left. Assume that friction and drag may be ignored.

(Pictureish looks like this, for mental vision... & = man, [] = boxes.... [a][b]& man pushing blocks <-- that direction.)

B: Determine the acceleration of each block. Clearly indicate both magnitude and direction. You muse use the information from your Free Body Diagrams drawn above (Have them written down, if needed I can post them up with an actual picture, just let me know) to solve for the acceleration. Show all necessary calculations.

A) Calculate the net horizontal force acting on each block. Clearly indicate both magnitude and direction. Which block experiences the greatest net force? Why? Provide an explanation with all necessary calculations.

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2. Ella is pulling her sister, Patience, who is on a sled on a snow covered sidewalk with a rope and force of 75 Newtons. Patience and the sled (mass of 36kg) are speeding up as they slide through the snow. Assume that the drag force is so small it can be ignored. The coefficients of friction for the surfaces of the sled on the snow are 0.12 (Static) and 0.05 (Kinetic). Consider Patience and the sled as one complete system.

A) (Done - Draw free body diagram - Don't need this already done but if needed I can post it for you if needed for calculations)

B: Use Free body diagram and apply Newton's 2nd law to determine the net horizontal force (magnitude and direction) acting on patience and the sled.

C) Calculate the resulting acceleration (magnitude and direction) of Patience and the sled.

D) Assuming that Patience and the sled started from rest and the acceleration calculated above remains constant, what is the velocity of both after moving 5.3 meters.

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3. A child twirls his yo-yo horizontally about his head rather than using it properly. The yo-yo has a mass of 0.200 kg and is attached to a string 0.800 meters long.

A) if the yo-yo makes a complete revolution each second. What tension must exist in the string?
B: If the tension in the string is doubled, what is the speed of the yo-yo?

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Multiple Choice:
4)
Motion illustrated below is the motion of the crate being pushed along the floor with a constant force by person.
*5----*4------------*3-------------------------2*-------------------------*1-------------------------*0
B: Non- zero net force directed to the left is acting on the crate during this entire time.
C) The acceleration of the crate remains constant
D) The crate must slide from one floor surface with a lower coefficient of friction to another floor surface with higher coefficient of friction
E) The force on the crate by the person is greater than the force on the person by the crate
F) The force due to kinetic friction and drag on the crate may be ignored.

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Multi Choice 5)

http://img534.imageshack.us/img534/1676/img20130410141951181.jpg
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Multi choice 6)
http://img715.imageshack.us/img715/5844/img20130410141938751.jpg

This post was edited by Trev on Apr 10 2013 01:24pm