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A high-speed flywheel in a motor is spinning at 450rpm when a power failure suddenly occurs. The flywheel has mass 40.0kg and diameter 80.0cm. The power is off for 35.0s and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 170 complete revolutions.
(A) At what rate is the flywheel spinning when the power comes back on?
(B) How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on?
(C) How many revolutions would the wheel have made during this time?
A mouse is running away from a cat at 0.75 m/s and, at 1.25 m from his mouse hole, he accelerates at a constant rate of 0.25 m/s2 until he reaches his hole safely. How long a time was required for him to cover the last 1.25 m?
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question1an atomic nucleus of mass 230 u moving at 400 ms emits an alpha particle of mass 4.0 u in direction of its
There is a region with a constant magnetic field 5.2T. The magnetic field is directed out of the page. What is the current induced in the rod if the resistance is 4.9ohms
When the concave side is used as a mirror, the magnification is +2.9. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror
An ideal gas has its pressure cut in half slowly, while being kept in a container with rigid walls. How much work was done during this process
What is the ideal banking angle for a gentle turn of 1.80 km radius on a highway with a 110 km/h speed limit (about 68 mph), assuming everyone travels at the limit
A computer hard disk starts from rest, then speeds up with an angular acceleration of 200.0 rad/s2 until it reaches a final angular speed of 7300.0 rpm. How long does it take for the disk to reach this angular speed
Concept to find certain type of electronic devices & circuits.
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