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A microwave oven is powered with an electron tube called a magnetron, which generates electromagnetic waves of frequency2.75 GHz. The microwaves enter the oven and are reflected with the walls. The standing wave pattern produced in the oven can cook food unequally, with hot spots in the food at antinodes and cool spots at nodes, so a turntable is often utilized to rotate the food and distribute the energy. If a microwave oven intended for utilize with a turntable is instead used by a cooking dish in a fixed position, the antinodes can appear as burn marks on foods such as carrot strips or cheese. The separation distance among the burns is measured to be 5cm ± 5%. From these data, compute the speed of the microwaves.
On a hot summer day, a young girl swings on a rope above the local swimming hole (Figure 1) . When she lets go of the rope her initial velocity is 2.20 at an angle of 35.0 above the horizontal.If she is in flight for 0.619 , how high above the water ..
a spring with a mass on the end of it hangs in equilibrium a distance of 0.4200 m above the floor. the mass is pulled
A beam of light traveling in air strikes the surface of mineral oil at an angle of 17.8° with the normal to the surface. If the light travels at 2.17 X 108 m/s in the oil, determine the index of refraction of mineral oil
question the speed of 3oz tennis ball is changed from 60 fts in one direction to 80fts in the opposite one as a racket
A bar is used to lift a 100 kg block of concrete. The pivot is 1.00 m from the block. Find the mechanical advantage
A potential difference of 1.00 V willbe applied to a 40.0 m length of18-gauge copper wire (diameter = 0.0400 in.). calculate the magnitude of the current density
A certain freely falling object requires 1.7s to travel the last 40m before it hits the ground. From what height above ground did it fall.
when the cylinder is fully immersed does the buoyant force acting on it depend on how far below the surface of the
A 4.0-m-long iron bar of uniform cross section is held perpendicular to the wall by a wire from the end of the bar to the wall. What is the tension in the wire
Two spaceships approach each other, each moving with the same speed as measured by an observer on the Earth. find the speed of each spaceship as measured on Earth
Two 5000 kg passenger cars roll without friction (one at 1 m/s, the other at 2 m/s) toward one another on a level track. They collide, couple, and roll away together with the combined momentum.
The graph shows the component of a force acting on an object, in newtons, versus the position of the object, in meters. Find the work done by the force
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