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Closed Systems: A 12 cm diameter piston-cylinder device contains air at a pressure of 100 kPa at 24oC. The piston is initially 20 cm from the base of the cylinder. The gas is now compressed and 0.1 kJ of boundary work is added to the gas. The temperature of the gas remains constant during this process. How much heat was transferred to/from the gas? What is the final volume and pressure in the cylinder? Find the change in entropy of the gas. Why is this value negative if entropy always increases in actual processes?
A capacitor that is initially uncharged is connected in series with a resistor and a 402.8V emf source with negligible internal resistance. Just after the circuit is completed, the current during the resistor is 0.840mA and the time constant for the ..
A protostar has a temperature of 3000 K,radius of 2*10^8 km at stage 4. At stage 6, Calculate the star's change in absolute magnitude as it evolves from stage 4 to stage 6
If the glider continues on with a speed of 0.300 m/s, what is the speed of the second glider? Is this collision elsatic?
A wooden raft has a mass of 90 kg. When empty it floats in water (density 1000 kg/m3) with 67% of its volume submerged. What mass of sand can be put on the raft without it sinking
A hydraulic jack for changing car tires is designed with a primary cylinder (the one you push down on) 1 cm in diameter and a secondary cylinder (the one that pushes up on the car) 5cm in diameter. how much force acts to lift the car
What is the current passing through each appliance in the parallel circuit?
Two packing crates of masses m1 =10.0 kg and m2 = 6.00 kg are connected by a light string that passes over a frictionless pulley as in the figure below.The 6.00 kg crate lies on asmooth incline of angle 45.0°. Find the acceleration of the 6.00 kg ..
a glass lens has a scratch-resistant plastic coating on it. the speed of light in the glass is 0.607c and the speed of
The voltage drop across a resistor is 4.0 V for a current of 1.0 A in the resistor. What is the current that will produce a voltage drop of 8.0 V across the resistor?
A 6.0-cm-diameter cylinder of nitrogen gas has a 4.0-cm-thick movable copper piston. How many gas molecules are in the cylinder
What angle should the second rock be thrown to arrive at the same point as the first? How many seconds later should the second rock be thrown, after the first was thrown, to arrive at the same time?
A 160 kg horizontal beam is supported at each end. A 300 kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports
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