Water is another valuable resource. Water is needed to irrigate crops; for drinking, sanitation, and transportation; and also to produce electricity. Many countries in this region are located along swiftly moving rivers. They are able to harness this water to generate electricity. Rivers running down mountains are dammed to produce hydroelectric power.
Answer:
Explanation:
According to the <u>Third Kepler’s Law</u> of Planetary motion:
(1)
Where;:
is the period of the satellite
is the Gravitational Constant and its value is
is the mass of the Earth
is the semimajor axis of the orbit the satllite describes around the Earth (as we know it is a circular orbit, the semimajor axis is equal to the radius of the orbit).
On the other hand, the orbital velocity is given by:
(2)
Now, from (1) we can find
, in order to substitute this value in (2):
(3)
(4)
(5)
Substituting (5) in (2):
(6)
(7) This is the speed at which the satellite travels
Answer:2.5 mph
Explanation:
Total time for trip=6 hr
Speed of roy=5 mph
the trip 4 miles one side
Let v be the stream velocity
time=