Answer:
0.011 N-m
Explanation:
Given that
The mass of a solid cylinder, m = 30 kg
The radius of the cylinder, r = 0.18 m
The acceleration of the cylinder, 
It rotates about an axis through its center. We need to find the torque acting on the cylinder. The formula for the torque is given by :

Where
I is the moment of inertia of the cylinder,
For cylinder,

So,

So, the required torque on the cylinder is 0.011 N-m.
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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Answer:
Sound wave types - longitudinal waves
Longitudinal waves - Vibrating string the creates sound in the way it moves.
Explanation:
Longitudinal waves have particles of the medium that are displaced in a parallel direction to energy transport.
The second one is correct not sure about the first one sorry