Physics Answers

A mass m of helium gas is in a container of constant volume V. It is initially at pressure P and absolute (Kelvin) temperature T. Additional Helium is added, bringing the total mass of helium gas to 3m. After this addition, the temperature is found to be 2T. What is the final gas pressure?

1.The potential energy of a certain system of two charges increases as the charges are moved farther apart.What does this tell us about the sign of the charges?why?

2.Show that volt per meter is the same as newton per coulomb.

3.A student said"electric potential is always proportional to potential energy,why bother with the concept of potential at all?How would you respond?

If two equal charges, each of 1 C are separated in the air by a distance of 1 km, what would be the magnitude and kind of force between them?

1.How would you define membrane potential?

2.What are the factors that could affect the ion movement?

3.If the membrane allows only positive charges to get through it,what happens to the concentration of both sides of the membrane?

4.From what you have learned in Biology,why is membrane potential essential among plants and animals?

A 200 g object is whirled in a horizontal circle with a cord of radius 1.2 m at 2261.95 cm/s. The centripetal acceleration is .

The piston of a hydraulic automobile lift is 30 cm in diameter. What pressure, in

pascals, is required to lift a car of mass 1500 kg. Also express this pressure in

atmosphere.

The expansion tank of a house hold hot water heating system is open to the

atmosphere and is 10 m above a pressure gage attached to the furnace. What is

the gauge pressure at the furnace, in pascals? In atmosphere?

Copper has a density of 9 g/cm3 and a bulk modulus of 1.2 x 1011 N/m2. What isthe speed of a wave through it?

Two point charges ares separated by a distance of one meter .The two point charges have magnitudes of 2.5x10^-4 C and 1.5 x10^-2 C.Find the electric force between the two. Round your final answer to it's nearest hundreths.

 How much work would be required to move 4.0C of charge between the same two points of the problem above?