Answer:
Explanation:
Given:
angular speed of rotation of friction-less platform,
moment of inertia with extended weight,
moment of inertia with contracted weight,
<u>Now we use the law of conservation of angular momentum:</u>
The angular speed becomes faster as the mass is contracted radially near to the axis of rotation.
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Answer:
10.53m/s²
Explanation:
Centripetal acceleration is the acceleration of an object about a circle. The formula for calculating centripetal acceleration is expressed by:
v is the velocity of the car = 24.5m/s
r is the radius of the track = 57.0m
Substitute the given values into the formula:
Hence the centripetal acceleration of the race car is 10.53m/s²
Answer:
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Explanation:
The car travels a distance of 200 kilometers for 1.31 × 10⁵ seconds.
We have:
The velocity of the car, v = 15.3 m/s
The distance traveled by car, d = 200 kilometers.
Now, let the time taken to travel the distance be t.
The formula for the speed of an object, when traveled a distance in a particular time, is given as:
Speed = distance / time
v = d / t
Now, d = 200 kilometers = 20 × 10⁴ m
Therefore,
t = d / v
t = 20 × 10⁴ m / 15.3
t = 131071.89 sec
t = 1.31 × 10⁵ sec
The car travel for a time 1.31 × 10⁵ sec.
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