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A certain microwave oven produces microwaves of frequency 2450 MHz with a power of 500 W. How long must it take to heat 519 g of water, initially at room temperature, to the boiling point? Suppose that all the microwave energy is absorbed by the water. (The microwave frequency is important because the water molecule has a rotational resonant frequency at 2450 MHz. This means that water very effectively absorbs radiant energy at this frequency, thus raising its rotational kinetic energy and its temperature. The specific heat of water is 4186J/kg–C°, and suppose that the room temperature is 20°C.)
A cube of mass m = 6.55 kg is placed on an inclined plane of mass M = 10.07 kg, which makes an angle ? = 42.20° with the horizontal. What is the normal force on the inclined plane
A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of 13.0 g. The duration of its burn is 1.90 s. find What is the average exhaust speed of the engine
A 10 g mass is located 10.0 centimeter from the center of a turn table. Find coefficient of static friction between mass and turntable
A cubic container is at rest on a rough horizontal warehouse floor. determine the minimum horizontal force that must be applied to the top of the container to cause tipping
a disk of radius 0.2meters and mass 0.25kg is free to rotate without friction about an axis through its center and
There are two objects. For object 1 the net force is 2 N pointing left on x axis. For object 2 the total force on the object is 0 N. What will their future motions be
One cylinder in the diesel engine of a truck has an initial volumeof 600 cm3. Air is admitted to the cylinder at 30 C anda pressure of 1.0 atm. What are its final temperature and volume
The Antarctic Circumpolar Waves propagates around the Antarctic continent during a period of about 8-9 years. What is the average speed of the perturbation
A 10-m-by-14-m house is built on a 12-cm-thick slab of concrete. What is the rate of heat loss through the slab
a 0.465 kg wood block is firmly attached to a very light horizontal spring k 165 nm . it is noted that the
In February 1955, a paratrooper fell 370 m from an airplane without being able to open his chute but happened to land in snow, find the magnitude of the impulse on him from the snow
A nonuniform electric field is directed along the x-axis at all points in space. This magnitude of the field varies with x , but not with respect to y or z. find the net electric flux passing through the cylindrical surface
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