Answer:
True
Explanation:
If the object moves at constant speed then it means that the velocity changes instantaneously although the speed does not change. The change in velocity brings out acceleration and where there is a mass that undergoes acceleration there must be an external resultant force. this force is centripetal force.
Answer:
At the closest point
Explanation:
We can simply answer this question by applying Kepler's 2nd law of planetary motion.
It states that:
"A line connecting the center of the Sun to any other object orbiting around it (e.g. a comet) sweeps out equal areas in equal time intervals"
In this problem, we have a comet orbiting around the Sun:
- Its closest distance from the Sun is 0.6 AU
- Its farthest distance from the Sun is 35 AU
In order for Kepler's 2nd law to be valid, the line connecting the center of the Sun to the comet must move slower when the comet is farther away (because the area swept out is proportional to the product of the distance and of the velocity: , therefore if r is larger, then v (velocity) must be lower).
On the other hand, when the the comet is closer to the Sun the line must move faster (, if r is smaller, v must be higher). Therefore, the comet's orbital velocity will be the largest at the closest distance to the Sun, 0.6 A.
Answer:
Moment of inertia of the flywheel,
Explanation:
Given that,
The maximum energy stored on flywheel,
Angular velocity of the flywheel,
We need to find the moment of inertia of the flywheel. The energy of a flywheel in rotational kinematics is given by :
I is the moment of inertia of the flywheel
On rearranging we get :
So, the moment of inertia of the flywheel is . Hence, this is the required solution.
Answer:
because the moon is nearer to the earth compared to the stars which we require telescopes to observe