Answer for 2,3,4,5 pls....very urgent

​Q2. An electric lamp suspended from the roof of a train by a flexible wire shifts through an angle of 30° when the train goes horizontally round a curved path of 200m radius. Find the speed of the train.

Q3. An aeroplane describes a vertical circle when looping. Find the radius of the greatest possible loop if the velocity of the plane at the lowest point of its path is 50m/s. Take g as 10 m/s–2

Q4. Calculate the kinetic energy of rotation of a circular disc of mass 1kg and radius 0.2m rotating about an axis passing through its centre and perpendicular to its plane. The disc is making 30rpm.

Q5. A flywheel rotating at the rate of 120rpm slows down at a constant rate of 2 rad/s–2. What time is required to stop the flywheel and how many potations does it make in the process ?

Dear Student ,
4. Here in this case the kinetic energy of rotation of a circular disc of of mass 1 kg radius 0.2 m is ,
K.E = 1/4 mr​2w2 = 2.5 x 10-3 J
Kindly ask different question in different posts .
Regards

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