Answer:
<h3>25.152m</h3>
Explanation:
Compete question;
A roller coaster has a loop in which the centripetal acceleration equals 9.8m/s² . If the tangential speed of the roller coaster cars is 15.7 m/s, find its radius.
centripetal acceleration a = v²/r
v is the tangential speed
r is the radius
Given
v = 15.7m/s
a = 9.8m/s²
9.8 = 15.7²/r
9.8r = 15.7²
r = 15.7²/9.8
r = 246.49/9.8
r = 25.152m
Hence the radius of the coaster is 25.152m
Answer:
The magnitude of angular acceleration of the motor is .
Explanation:
Given that,
Initial angular velocity,
Final angular velocity,
Angular displacement,
Let is the magnitude of the angular acceleration of the motor. It can be calculated using third equation of rotational kinematics as :
So, the magnitude of angular acceleration of the motor is .
I believe the correct answer would be "A" energy source.