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One kilowatt-hour (kWh) is the amount of work or energygenerated when one kilowatt of power is supplied for a timeof one hour. A kilowatt-hour is the unit of energy used bypower companies when figuring you electric bill. Determine the numbner of joules of energy in one kilowatt-hour.
A hydrogen balloon at Earth's surface has a volume of 6.78 m3 on a day when the temperature is 26.5°C and the pressure is 1.00 x 105 N/m2. The balloon rises and expands as the pressure drops. What would the volume of the same number of moles of hydro..
A block of mass=0.750kg is fastened to an unstrained horizontal spring whose spring constant is k=65.0N/m. The block is given a displacment of 0.220m and then released from the rest.
A skier leaves the ramp of a ski jump with a velocity of 30.0 m/s The slope is inclined at 50.0°, Find the distance from the ramp to where the jumper lands
A 9.0-V battery is connected in series with a 35-mH inductor, a 168-? resistor, and an open switch. How much energy is stored in the inductor at this time
A 3.60 long, 420 steel beams extends horizontally from the point where it has been bolted to the framework of the new building under construction. A 72.0 construction worker stands at the far end of the beam. What is the magnitude of torque about the..
A homemade capacitor is assembled by placing two 10 in pie pans 11 cm apart and connecting them to the opposite terminals of a 9 V battery. Estimate the charge on each plate
A +1 uC charge is held 10 cm directly above the origin. A -1 uC charge is held 5 cm directly to the right of the origin. What is the electric potential at the origin
You have a small electromagnet that consumes 300 W from a residential circuit delivering 120 V at 60.0 Hz. What is the internal resistance of the electromagnet
A uniform 20.0 chain 2.00 long supports a 55.0 chandelier in a large public building. Find the tension in the middle link of the chain
In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar and has a range of 26 m. Suppose the launch speed is doubled, and the projectile is fired at the same angle above the grou..
According to the shop manual, when drilling a 12.1-mm-diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1400 rev/min. find the maximum linear speed of any part of the bit
A pendulum consisting of a small sphere with mass 1.135 kg suspended by a string of length 72.23 cm is hanging from the ceiling. Its motion is restricted by a peg that is sticking out of the wall 43.03 cm directly below the pivot point. What is the p..
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