explain how many minimum number of geostationary satellites are required for global coverage of T. V transmission

The aluminum rod AB (G = 26 GPa) is bonded to the brass rod BD (G = 39 GPa). Knowing that portion CD of the brass rod is hollow and has an inner diameter of 40 mm, determine the total strain energy of the two rods. Take TA = 900 N·m.

If i pushes a box that weighed 100 N across a 5 m distance, how much work did i do on the box.

Which statements correctly describe laser light? Check all that apply. Laser light contains many wavelengths of light. Laser light is stronger than ordinary light. Laser light is all one color.

Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 22 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 61 cm

The velocity of sound in air at sea level is about 1100 ft/s. If a person hears a clap of thunder 4.00 s after seeing a lighning flash, how far is the lightning bolt?

People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques.

A hot air ballon with a mass of 500kg ascends at a constant rate of 1.5 m/s for 20s. how much work is done by the upward force?

A construction team gives an estimate of three months to repave a large stretch of a very busy road. The government responds that it's too much inconvenience to have this busy road obstructed for three months, so the job must be completed in one

Determine the time needed for the load at b to attain a speed of 10 m/s, starting from rest.

A tea kettle is warmed on an electric stove. After a while, water vapor builds inside the kettle and causes a whistle in the lid to make a sound. How does this demonstrates the first law of thermodynamics?