A ball is attached to astring that is hanging from a bar. You give the ball a qu
ID: 1742919 • Letter: A
Question
A ball is attached to astring that is hanging from a bar. You give the ball a quick pushso that the ball moves in a horizontal circle at constant speed.Call the initial time 2 seconds after you have given the ball apush. The final time is then half a period after the initial time.IS ENERGY CONSERVED, OR NOT CONSERVED FOR EACH OF THESYSTEMS?System: ball
System: ball + string + earth
System: ball + string
On a roller coaster ride the cars are taken up to the top of a hilland on a set of tracks. The cars are briefly stopped at the top ofthe hill and then the cars travel along the rest of the track thathas lots of hills and turns. The cars are brought to a stop at theend of the ride by the wheels locking and the cars sliding. Callthe initial time when the cars are stopped at the top of the hilland the final time when the ride is over.IS ENERGYCONSERVED OR NOT CONSERVED FOR EACH OF THESYSTEMS?
System: track
System: cars
System: cars + earth
System: track + cars + earth
System: track+earth
Explanation / Answer
A ball is attached to astring that is hanging from a bar. You give the ball a quick pushso that the ball moves in a horizontal circle at constant speed.Call the initial time 2 seconds after you have given the ball apush. The final time is then half a period after the initial time.IS ENERGY CONSERVED, OR NOT CONSERVED FOR EACH OF THESYSTEMS? System: ball System: ball + string + earth System: ball + string for ball energy is not conserved because potential energy is notdefined for one object. for items 2 and 3 energy will be conserved. On a roller coaster ride the cars are taken up to the top of a hilland on a set of tracks. The cars are briefly stopped at the top ofthe hill and then the cars travel along the rest of the track thathas lots of hills and turns. The cars are brought to a stop at theend of the ride by the wheels locking and the cars sliding. Callthe initial time when the cars are stopped at the top of the hilland the final time when the ride is over.IS ENERGYCONSERVED OR NOT CONSERVED FOR EACH OF THESYSTEMS? System: track System: cars System: cars + earth System: track + cars + earth System: track+earth except for items 1 and 2 for all energy will be conserved.
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