(5 bulbs) x (25 watt/bulb) x (6 hour/day) x (30 day/month) =
(5 x 25 x 6 x 30) watt-hour/month =
22,500 watt-hour/month .
The most common unit of electrical energy used for billing purposes
is the 'kilowatt-hour' = 1,000 watt-hours .
22,500 watt-hour/month = <em>22.5 kWh/month</em>.
(22.5 kWh/month) x (1.50 Rs/kWh) = <em>33.75 Rs / month
</em>
This is a simple application of Newton's Law of Universal Gravitation.
The force of gravity is inversely proportional to the distance between the two
centers of mass. We don't need to know the mass of earth or the test mass to
solve this, because we'll be setting up a proportionality, which means that all
controlled variables can be expressed as a proportionality constant which will
eventually cancel. <span>
Set up the following proportionality equation from
Newton's Universal Gravitation:
F = k/d²; where k is the constant of proportionality
Plug in values for F and d, making two
equations:
(9.803 N) = k/r²; where r is the radius of earth,
and
(9.792 N) = k/(r+h)²; where h is the height above
sea level.
Divide one by the other, and you get:
9.803 / 9.792 = (r+h)² / r²; the k cancels
Solve for h:
√(9.803 / 9.792) = (r+h) / r
r √(9.803 / 9.792) = r + h
r √(9.803 / 9.792) – r = h
Look up the value for r (radius of earth) and
evaluate:
(6371 km) √(9.803 / 9.792) – (6371 km) = h
<span>h ≈ 3.58 km</span></span>
Albert Einstein was a German-born theoretical physicist. He developed the general theory of relativity, one of the two pillars of modern physics. Einstein's work is also known for its influence on the philosophy of science.
Answer:
Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves that require a medium in order to transport their energy from one location to another. ... Sound is a mechanical wave and cannot travel through a vacuum.
As kmoefgthdyfjkhyutgfrdescfgvh
