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A microwave oven is powered by an electron tube called amagnetron that generates electromagnetic waves of frequency2.15 GHz. The microwaves enter the ovenand are reflected by the walls. The standing wave pattern producedin the oven can cook food unevenly, with hot spots in the food atantinodes and cool spots at nodes, so a turntable is often used torotate the food and distribute the energy. If a microwave oven isused with a cooking dish in a fixed position, the antinodes canappear as burn marks on foods such as carrot strips or cheese. Theseparation distance between the burns is measured to be5.60 cm. Calculate the speed of the microwaves from these data.
m/s
Consider an elevator that is hanging from a strong cable. The elevator is initially at rest. It then accelerates upwards for 2 seconds, due to the cable pulling. It then then slows down, still moving upwards, until it comes to a stop. Pick out any..
Figure (a) below gives the magnitude E(x) of the electric fields that have been set up by a battery along aresistive rod of length L = 9.02 mm (Fig. belowb). The vertical scale is set by Es =4.02 ×103 V/m.
A camera has a lens with a focal length of 29.4 cm. When an object is placed 3.95 meters away is being photographed, how far from the film should the lens be placed
An anthropologist focuses her camera on a distant mountainpeak when she sees a very interesting looking monkey just 5.2 m away. Quickly sheadjusts the focus and takes the picture. If her lens has a focal length of 41mm,
A 1800 kg truck traveling north at 33 km/h turns east and accelerates to 50 km/h. What is the change in the truck's kinetic energy
a boy pulls a loaded wagon having a total mass m=100kg. He applies a constant force F=100N along the handle at 30 degrees, compute the horizontal force on the wagon
The construction of a flat rectangular roof (5.15 m × 7.44 m) allows it to withstand a maximum net outward force of of 2.33 × 104 N. At what wind speed will this roof blow outward
Water starts moving at 10 meters per second at the top of the hill at a pressure of 1 atm. It moves down a pipe and exits at the bottom. The change in height is 5 meters. If the radius of the pipe at the top is 0.1 meters and the radius of the pipe a..
If the moment of inertia of the wheel about its axle is 0.30kg*m2, what is the magnitude of the frictional torque.
What is the natural frequency of a LC circuit with L = 20 mH and C = 800 F? The capacitor is initially charged to 12.0 V
the magnetism of the earth acts approximately as if it originates from a huge bar magnet within the earth. which of the
In a model AC generator, a 503 turn rectangular coil 5.0 cm by 21 cm rotates at 120 rev/min in a uniform magnetic field of 0.59 T. What is the maximum emf induced in the coil
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