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

The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

What is the total current flowing through a 45 ohm resistor (1.4 amps) and a 20 ohm resistor (1.8 amps) ?

A cup of hot coffee can be cooled by placing a cold spoon in it. A spoon of which of the following materials would be most effective for this purpose: aluminum, copper, iron, or glass? Assume all spoons have the same mass.

After your experiment is complete and all the data has been compiled, which would best describe a reasonable conclusion? A. My conclusion answers my hypothesis, therefore, it had to be true. B.

What is the mechanical advantage of the machine shown below? a 5 b 4 c 3 d 2

If a car has a speed of 85 m/s and travels for 120 seconds, how far does it go?

In the scientific method, a hypothesis is a

According to Kepler's second law, where in a planet's orbit would it be moving fastest? Where would it be moving slowest?

What is energy from the sun called?