1) In which one of the following systems is there an increase in gravitational p
ID: 2023872 • Letter: 1
Question
1) In which one of the following systems is there an increase in gravitational potential energy?a. a girl jumps down from a bed
b. water is forced downward through a pipe
c. a car ascends a steep hill
d. a crate rests at the bottom of an inclined plane
e. a boy stretches a horizontal spring
2) Two cars are driving at the same constant speed v around a racetrack. However, they are traveling through turns that have different radii. Car A is traveling through a turn with radius r and car B is traveling through a turn with radius 0.5 r. Which statement is true about the magnitude of the centripetal acceleration of each car?
a. The magnitude of the centripetal acceleration of car A is less than that of car B, since the radius of the circular track is larger for car A
b. The magnitude of the centripetal acceleration of car A is greater than that of car B, since the radius of the circular track is larger for car A.
c. The magnitude of the centripetal acceleration of each car is the same, since the cars are moving at the same speed.
d. The magnitude of the centripetal acceleration of car A is greater than that of car B, since the radius of the circular track is smaller for car A.
Explanation / Answer
c. a car ascends a steep hill
Reason
As the car ascends(go upward),its height with respect to ground increases,so there is increase in gravitational potential energy.
a. The magnitude of the centripetal acceleration of car A is less than that of car B, since the radius of the circular track is larger for car A
Reason
As the centripetal acceleration is given by v^2/R
As for car A R is greater than that of car B .
Thus the magnitude of the centripetal acceleration of car A is less than that of car B
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.