Answer:
15.99861 seconds
1865.58658 Joules
Explanation:
= Angular acceleration
= Angle of rotation
I = Moment of inertia of disc = 0.031 kgm²
t = Time taken
Initial angular speed
Final angular velocity
From the equation of rotational motion
Time taken by the turntable to slow down is 15.99861 seconds
Rotational energy is given by
The work has to be done on the turntable to bring it to rest is 1865.58658 Joules
Answer:
Torque,
Explanation:
Given that,
The number of turns in the coil, N = 47.5
Radius of the coil, r = 5.25 cm
Uniform magnetic field, B = 0.535 T
Current in the coil, I = 26.9 mA
The magnitude of the maximum possible torque exerted on the coil isg given by :
So, the magnitude of the maximum possible torque exerted on the coil is .
Answer:
a) No. The kinetic energy of the ball decreases.
b) The potential energy of the ball increases.
c) The ball would go half of the original distance.
Explanation:
a) The kinetic energy would be converted to potential energy as the ball goes higher. Since the total mechanical energy is conserved, the kinetic energy would decrease.
b) The potential energy of the ball would increase. Since the total mechanical energy of the ball is conserved, the ball would lose speed, and therefore kinetic energy. In order to compensate the loss of kinetic energy, the ball would gain potential energy as it goes higher.
c) The relation of the energy and mass is as follows:
According to the energy conservation
The maximum height that the ball reaches is proportional to the initial velocity. If the ball would be imparted with the same amount of energy, its final potential energy would be the same. However, in order to have the same potential energy (mgh), its height would be half of the original case.