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A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?
A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is
A ball is thrown vertically upward with a speed of 10m/s.1sec later from the same position ball b is thrown vertically upward at the same path with the speed of 25m/s.what is the height of ball b when it meets ball a
a car travelling south at 36 m/s sounds a 456 hz horn . what frequency is heard by the driver in an approaching truck traveling north at 25 m/s? what frequency is heard by the driver if he is heading south away from the car at 25 m/s?
Calculate the first cosmic velocity for a satellite launched from the Moon, near the surface several hundred km. Compare this value with that of the Earth, which as you know is about 8 km / s. The radius of the Moon is R = 1740 km, while the acceleration of the free fall near the surface of the Moon is g = 1.6 m / s²
Calculate the first cosmic velocity for the planet Jupiter. The radius of Jupiter is R = 7 × 10⁴ km, while the acceleration of free fall near the surface of the planet is g = 26m / s².
16. The artificial satellite with mass m = 5 t flies at an altitude of h = 1600 km in a circular trajectory. Calculate the centripetal force and period of the satellite. The radius of the Earth R = 5400 km is known. Acceleration of free fall at an altitude of 1600 km to take g = 6.4m / s².
1. At a distance of R = 8500 km from the center of the Earth an artificial satellite moves at a speed V = 6.8 km / s. Calculate the force of gravitational pull exerted by the Earth on a satellite of mass m = 10t
The motorcyclist crosses the turn at a speed V = 40 km / h, which is less than the allowed speed of the sliding threshold. At what angle should the motorcyclist lean from the vertical position, when it is known that the turning radius is R = 40 m?
The motorcyclist crosses a horizontal turn with radius R = 25 m at a speed of V = 50 km / h, being on the slip threshold. Calculate the coefficient of sliding friction and the angle of stability.
