If Gary rests his hand on a book, it will be much more comfortable for him than if he rests his hand on the point of a tack. This is because of A) The pressure exerted on his hand is greater with the tack B) The force exerted on his hand is greater with the tack C) The Pressure exerted on his hand is greater with the book D) The force exerted on his hand is greater with the book
Viscosity
The measure of the resistance of a fluid to flow is known as viscosity. Most fluids have some resistance to motion, the resistance provided by the fluid is called viscosity. This resistance is created by the force of attraction between the fluid molecules. If you pour water through a funnel, it flows easily and quickly, because it has very little resistance. But if you pour honey through a funnel, it may take a little time longer, as the density of honey is high.
Poiseuille's Law
The law of Poiseuille or Poiseuille's equation states that the pressure drop of an incompressible fluid especially a liquid in a laminar flow that passes through a cylindrical tube of length L, radius r, pressure gradient ΔP, and mainly depends on the viscosity of the fluid is nothing but the pressure difference of the layers of fluids. ΔP=P1-P2
Drag Forces
Forces that occur due to the movement of fluid are known as fluid mechanics. Following are the fluids present:
If Gary rests his hand on a book, it will be much more comfortable for him than if he rests his hand on the point of a tack. This is because of
- A) The pressure exerted on his hand is greater with the tack
- B) The force exerted on his hand is greater with the tack
- C) The Pressure exerted on his hand is greater with the book
- D) The force exerted on his hand is greater with the book
The pressure on the outside of your body when you are 5 feet underwater in your favourite lake is due to
- A) The weight of the water above you
- B) The weight of the air above you
- C) The weight of both the water and the air above you
Two atoms with the same number of protons but a different number of electrons are known as
- A) molecules
- B) isotopes
- C) nuclides
- D) ions
If you examine a lithium atom's nucleus, how many neutrons would you expect to find
- A) definitely 4
- B) maybe to but most likely 4
- C) definitely 3
A brick falls from the top of the building and thuds into the ground below. If the brick started out with 25 J potential energy, wheredid all that energy go once the brick is at rest? select all that apply
- A) the sound the brick makes when hits the ground
- B) temperature increases of theair and the ground
- C) chemical potential energy in the brick
- D) kinetic energy of the air molecules accelerated by the brick as it collided wiht them
During a storn the wind is blowingalarmingly fast parallel to the side f yourhouse. What is the danger to your windown on that side of the house
- A) there is no danger as long as the wind is parallel to the surface of the windows
- B) the pressure imbalance could cause your windows to break outward
- C) the pressureimbalance could cause your window to break inward
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