1. What is the center of buoyancy and metacenter?
Center of Buoyancy: When a body is placed in a fluid, the fluid exerts an upward force which is called buoyant force. Center of buoyancy is the point at which the whole buoyant force acts upwards
If the vessel is floating upright, the center of gravity and the center of buoyancy are in the same line.
Meta Center: It is the line drawn through the center of buoyancy of a floating vessel and corresponding line through a new center of buoyancy when the vessel is tilted.
2. Can the walk of man be an example of a resolution of vector?
An example of the resolution of a vector is the way a person walks. When a person walks, he/she presses the ground obliquely, (i.e., at an angle to the ground) in the backward direction. The ground offers an equal and opposite reaction in the opposite direction. The vertical component of this reaction balances the weight of the person. The horizontal component helps the person to walk.
3. If you wet your hand and pick up an ice tray that is below $0^{\circ}C$, your hands may stick to it. This does not happen to wood, why?
In fact, since wood is not warmer than the environment (unlike your hand) it may be easier for this to happen with wood. (Explain it more).
4. Do you expect the gas in the cooking gas cylinder to obey the ideal gas equation?
No. Because,
1) In a cooking gas cylinder, the gas is kept at high pressure and at room temperature. Real gases behave ideally only at low pressure and high temperature.
2) Cooking gas is kept in liquid state inside the cylinder because liquid state does not obey the ideal gas equation.
No comments:
Post a Comment