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This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   In the following ticker tape experiment, which one(s) has(have) acceleration

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   If you push a 4.0-kg mass with the same force that you push a 10-kg mass from rest,

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   Select the one that explains best the technology behind an airbag.  

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   Where is the center of mass for the following item?  The black dot represents the location of the center of mass.    

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   If you push a 20.0-kg mass with the same force that you push a 5-kg mass from rest,

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   Jane stands motionless on a skateboard.    Her friend dropped a ball from a second story window.   Janet catches it.  Ignore air friction, 

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   Johnny brought some balloons for his mom’s birthday party.  He tied the balloons at the back of his truck and started driving.  While he was driving, he saw a dog crossing the street.  He stopped short to avoid hitting the dog.  

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A skateboarder with a mass of [a] kg at a skate park rides along the path shown in the following figure. If the speed of the skateboarder at point A is [x]  m/s and the height of the ramp is [y] m.  If the height in point B is [z] m, what is her speed in m/s at point B?  Assume that friction is negligible.  

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A child starting from rest slides down each of the four slides A to D. Each has the same vertical height.  Consider friction and air resistance, Which one has the highest velocity when the child reaches to the bottom

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A car going in a circle with a constant speed v. How much work is done by the centripetal force F on the car after it travels half way around the circle in time t?