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A typical microwave oven has a power consumption of about 1200 W. Estimate how long it should take to boil a cup of water in the microwave, assuming that 50 percent of the electrical power consumption goes into heating the water. How does this estimate correspond to everyday experience? (Assume that the water is initially at 30°C and that the cup contains 218 g of water.)
Two identical 19.1?kg spheres of radius 12.7cm are 35.7cm apart (center-to-center distance). If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact
The interior of a refrigerator has a volume of 0.600 m3. The temperature inside the refrigerator in 282 K, what is the mass of air inside the refrigerator
in a particular region of the earth's atmosphere, the electric field above the earth's surface has been measured to be 153 N/C downward at an altitude of 241m, Calculate the volume charge density of the atmosphere
A 2.93-kg model rocket is launched vertically upward with sufficient initial speed to reach a height of 3.71·102 m, even though air resistance (a nonconservative force) performs -6.11·102 J of work on the rocket.
A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3 and the density of helium in the balloon is 0.18 kg/m3. What is the magnitude of the buoyant force on each person
What is the electric field strength between the disks. What is the speed of the box at the end of the 5.7-s interval.
A person rides a bike 6.5 miles in 26 min up a mountain, climbing 1900 vertical feet. how much work did his muscles do
The wingspan (tip-to-tip) of a Boeing 747 jetliner is 59 m. The plane is flying horizontally at a speed of 300 m/s. Find the emf induced between the wing tips
Distance between focal plane and lens
Biologically usefull technetium nucleuii (at wt 99) have half life of 6 hours. A solution containing 10^-12 gram of this is injected into the bladder of a patient.
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. What is the volumetric flow rate through the pipe
A uniform diving board, of length 5.21 m and mass 50.4 kg, is supported at two points; What is the force acting on the board due to the right support when a diver of mass 62.9 kg stands at the end of the board over the water
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