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TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each channel. Suppose you measure the lengths of the wires for channels 4 and 3 and find them to be 2.23 and 2.45 m long, respectively.
What is the frequency for channel 4?
What is the frequency for channel 3?
An arrow is launched from a height of 1.21 m above the ground with an initial velocity of 48.3 m/s, What will be the maximum height the arrow will reach during its trajectory
A square solenoid of length 6.82 cm has 212 turns and carries a current of 10.8 A. The sides of the solenoid measure 2.06 cm. find the magnetic flux through the cross-sectional area of the solenoid
.250 kg ball is dropped to the floor from a height of 1.0 m and upon rebounding, reaches a height of .60 m. What is the impulse delivered to the ball by the floor?
A gamma-ray photon produces an electron and a positron, each with a kinetic energy of 259keV, Determine the energy of the photon
Two charged spherical conductors are connected by a long conducting wire, and a charge of 15 μC is placed on the combina- tion. One sphere has a radius of 4.05cm and the other a radius of 6.05cm.
In a parallel plate capacitor, two plates are being discharged by a constant current. Each plate has a radius of 4.0 cm. During the discharging, at a point between the plates at radial distance 2.0 cm from the central axis, the magnetic field has ..
A hot air heating system rated at 84,000 Btu/hr has an efficiency of 65%. The furnace fan can move 225 ft3 of air per minute. If the air enters the furnace at 60.0°F, determine the temperature of the outlet air.
The Achilles tendon inserts on the calcaneus at a distance of 8cm from the axis of the ankle joint. What torque is created by these muscles about the ankle joint
If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop?
A rotational axis is directed perpendicular to the plane of a square and is located . Two forces, 1 and 2, are applied to diagonally opposite corners, and act togther the sides of the square, first as shown in part a and then as shown in part b of..
At a construction site, a 63.0 bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 83.0 box on the horizontal roof. The cable pulls horizontally on the box, and a 45.0 bag of g..
What is the resultant vector, R, obtained by adding vectors C and D? Express the magnitude to three significant figures. Express the angle to one decimal place.
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