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An electric-dipole antenna is located on the roof of a 213-m-high building and is oriented vertically. An observer on the ground measures the intensity of the radiation from the antenna and finds 8.49 mW/m2. This observer is 1.03 km away from the antenna. A second observer hovers in a blimp at an altitude of 561 m and measures the radiation intensity from the antenna when she is 1.37 km from the antenna. What intensity, in milliwatts per square meter, does she measure?
What is the object distance? Knowing that the focal point is at 50, calculate the image distance. What is the calculated image distance
Suppose the latent heat of vaporization of H2O were twice its actual value. Other things being equal, would it take the same time, a shorter time, or a longer time for a pot of water on a stove to boil away? Would the evaporative cooling mechanism of..
The head of a hammer with a mass of 1.5kg is allowed to fall onto a nail from a height of 0.70m, What is the maximum amount of work it could do on the nail
a nearsighted person cannot see objects clearly beyond 25 cm her far point. if she has no astigmatism and contact
on june 14 2005 asafa powell of jamaica set a worlds record for the 100-m dash with a time t 9.77 s. assuming he
Three polarizing filters are stacked, with the polarizing axis of the second and third filter at angles of 25.0o and 90.0o, respectively, to that of the first. What is the intensity of the incident light
Use energy conservation to discover the mass of Planet II where it is observed that a meteor is approaching in a collision course. At7514 km from the center of the planet, the meteor has a speed of136.0 m/s and later at 2823 km a speed of 392.0 m/s.
How does size effect fluorescence or emission from quantum dots and what you know about single quantum dot experiments for Nitride based quantum dot materials - as outlined in the lectures
If a curve with a radius of 83 m is properly bamked for a car traveling 70 km/h, what must be the coefficient of static friction for a car not to skid
An electromagnetic wave of wavelength 450 nm is traveling in vacuum in the -z direction. What is the magnetic-field amplitude of this wave
a rocket of total mass m contains fuel of mass m. thus the rocket without any fuel would have a mass of m-m. the fuel
A 7.80-nF capacitor is charged up to 15.0V , then disconnected from the power supply and connected in series through a coil. Calculate the maximum charge on the capacitor
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