(4) Which of the statements are correct (indicate with a C ) and which are incor
ID: 1485934 • Letter: #
Question
(4) Which of the statements are correct (indicate with a C) and which are incorrect (indicate with an I)?
A person descending in an elevator who measures their weight as less than they would if the elevator was stopped at a floor, must be speeding up.
The displacement used when calculating the work done on an object equal in magnitude to the total distance that object travels.
A cart in a vertical roller coaster in circular motion slows near the top because of the work done on it by the normal force of track on the cart.
Explanation / Answer
1.A person descending in an elevator who measures their weight as less than they would if the elevator was stopped at a floor, must be speeding up ( C)
Reason: weight is m(g-a)
2.The displacement used when calculating the work done on an object equal in magnitude to the total distance that object travels. (I)
Reason: Displacement is shortest distance
3.
A cart in a vertical roller coaster in circular motion slows near the top because of the work done on it by the normal force of track on the cart. ( C)
Net force is mg - mv^2/R (mv^2/R is centripetal force)
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