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7.4 mol of helium are in a 16 L cylinder. The pressure gauge on the cylinder reads 68 psi . What are
(a) the temperature of the gas in degrees C and
(b) the average kinetic energy of a helium atom?
An unknown mass is placed on one side of the Atwood's machine. The downward acceleration of the mass 5kg is observed to be exactly one-half of the acceleration due to gravity. determine the tension force and the unknown mass
A 131 kg sign hangs between two buildings by two cables. Cable 1 is attached at a 36 degree angle wrt to the horizontal, and Cable 2 is attached at a 24 degree angle wrt to the horizontal. What is the tension in cable 1.
Ball 1, with a mass of 130g and traveling at 14m/s, collides head on with ball 2, What are the final velocities of each ball if the collision is perfectly elastic
You have two identical lenses, each with a focal length of 16 cm, and you have a 13 mm tall object which you would like to image. Where will the final image be located and what is its height
The police at the scene of the accident observed that the point of impact is 120 m from the base of the cliff. Explain how fast was the car traveling when it went over the cliff?
During a very quick stop, a car decelerates at 7.2 m/s2. Assume the forward motion of the car corresponds to a positive direction for the rotation of the tires, How long does the car take to stop completely in seconds
The output voltage of an AC generator is given by ?v = (120 V) sin (80?t). The generator is connected across a 21.0-? resistor. Find the maximum current in the resistor
Sarah throws a ball too hard so it is over Julie's head when it reaches Julie's horizontal position, What is the speed of the ball when it leaves Sarah's hand
A 1.02 liter flask contains a certain quantity of ideal gas at 315 K. Then an equal number of molecules of the same gas are added to the flask, after which the absolute pressure is 1.60 times its original value. What is a final temperature.
Illustrate what tangential speed v must the bob have so that it moves in a horizontal circle with the string making an angle 19.0^circ with the vertical?
A mass m equals 4 kg on a slanted surface theta equals 30 degrees. A light rigid cord runs from mass m to pully beta equals 1/2, calculate the magnitude of the systems acceleration
Five seconds later, the police officer leaves on her motorcycle, starts her stopwatch, and accelerates at 2 m/s^2 toward the car. According to her stopwatch, how many seconds until she catches the car
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