The circular groove is provided in a saucer for placing the tea only to prevent the cup from falling over in the case of sudden shocks. Other reason could be to provide support to the cup, or else the cup will fall when we change our direction due to Inertia of Direction.
Answer:
bouyant force - the upward force on an object in a fluid
boiling point - the temperature at which a liquid becomes a gas
solubility - the ability of a substance to dissolve in another
conductivity- the ability to transfer heat or electricity
density - the amount of mass in a given volume
Answer:
The statement is not correct.
Reason:
If two objects have the same mass, their respective densities determine their volumes.
By definition,
density = mass/volume.
or volume = mass/density.
Therefore if two objects have the same mass, the mode dense object (with higher density) will occupy less volume than the other object.
The box is kept in motion at constant velocity by a force of F=99 N. Constant velocity means there is no acceleration, so the resultant of the forces acting on the box is zero. Apart from the force F pushing the box, there is only another force acting on it in the horizontal direction: the frictional force
which acts in the opposite direction of the motion, so in the opposite direction of F.
Therefore, since the resultant of the two forces must be zero,
so
The frictional force can be rewritten as
where
,
. Re-arranging, we can solve this equation to find
, the coefficient of dynamic friction:
It's <em>chemical energy</em>.
It started out as energy carried in solar radiation. It was absorbed by plants, and they stored it as chemical energy in their stems and leaves. The plants got cut down, washed off, and delivered to the supermarket. Your mom brought them home, camouflaged them so they wouldn't look like veggies, and put them on your plate while you weren't looking. Eventually, some of them got into your body, got digested, and their energy got stored in your cells as glucose and fat. When you needed some energy to do something physical or mental, you grabbed some of that energy that you had stored as chemical energy, and used it to operate your muscles and your brain. You used the glucose (blood sugar) first, and if you ever reached the point where that was running low, you started to use the fat that you have stored around in many places.
