# Physics

A cup has a mass of 0.0650 kg and a volume of 0.000250 m^3 and is floating in fresh water. Pennies are out into the cup until the top of the cup is level with the water line. What is the mass of the pennies in the cup.

Anita is running to the right at 5 , as shown in the figure. Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 10 . According to her friends, with what speeds was the ball 1 thrown? According to her friends, with what speeds …

An electric motor has an effective resistance of 38.3 and an inductive reactance of 47.2 when working under load. The rms voltage across the alternating source is 460 V. Calculate the rms current.

A candle flame and a screen are 180 cm apart. A lens is placed between them. ForÂ
a certain position of the lens a twice magnified clear image is obtained on theÂ
screen. The lens is now moved away from the candle through 30 cm. To obtainÂ
another clear Â image on the screen, the distance through which the screen has toÂ
be moved is Â _________ and the new magnification of the image is __________.

A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = Ã¢â‚¬â€œ68 cm. What is the acceleration of the particle?

phy need it in 10 hrsÂ
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A 10.0 cm radius piston compresses a gas isothermally from a height of 15.0 cm to 2.50 cm at a constant pressure of 2.0 atm.

a) How much heat was added to the gas?

) Now if 7000 J of heat is added to the system and the piston is only moves 5.0 cm up, what is the change in the internal energy of the system is the pressure is again constant at 2.0 atm?

Sketch a PV diagram for the following process:

a) A 2.0 L gas undergoes an isovolumetric increase in pressure from 1.0 atm to 2.0 atm

b) An isothermal compression from 2.0 atm and 2.0 L to 1.0 atm and 1.0 L

) An isobaric compression from 2.0 L to 1.0 L

An ideal gas expands at a constant total pressure of 2.5 atm from 3.45 L to 6.70 L. Heat then flows out of the gas at constant volume, and the pressure and temperature are allowed to drop until the temperature reaches its original value. Calculate:

a) the total work done by the gas in the process

Heat flows into an ideal gas at a constant volume. The pressure increases from 1.5 atm to 5.5 atm. Next the gas is compressed at constant pressure from 5.0 L to 2.5 L and goes back to its original temperature.

What is the total work done on the gas in the process?

b) What is the total change in internal energy?

An object has a weight of 400 N when it is dry. When it is completely submerged in water is has a weight of 150 N. What is the density of the material is the density of water is 1000 kg/m3?

A piece of gold with a mass of 5.50 kg and density of 19300 kg/m3 is suspended from a string and then totally immersed in a beaker of water. Using density of water is 1000 kg/m3

a) Determine the volume of the piece of gold.

b) Determine buoyant force on the gold when it is submersed.

A CD with a diameter of 12.5 cm goes from rest to a tangential velocity of 5.6 m/s. If it does this in 2.5 seconds, what is its angular acceleration?

If a car horn honking that is 450 m is heard 1.3 seconds after it goes off, what is the temperature in degrees Celsius?

.50 moles of an ideal gas is at 560K. Is the gas undergoes an adiabatic compression and 3750 J of work is done on the gas, what is the final temperature of the gas?