The satellite is in circular motion, and the only force acting on it is the gravity exerted from the Earth:
where
is the gravitational constant,
is the Earth's mass, m is the mass of the satellite and r is the radius of the circular orbit.
Since it is a circular motion, this force acts as centripetal force,
:
where v is the satellite's speed.
But the speed is also equal to the distance covered in one revolution (which is the circumference:
) divided by the time needed to cover one revolution (which is the period T=6560 s):
By replacing this into the previous formula and simplifying ,we get
And re-arranging and substituting the values, we find the radius of the orbit:
The equation of motion of a particle is given by,
s =
Let velocity of particle is denoted by v.
The velocity of the particle is given by,
velocity (v) =
v =
v =
v =
Thus, Velocity of particle is given by,
v =
Let acceleration of the particle is denoted by a.
The acceleration of particle is given by,
Acceleration =
a =
a =
a = 12t - 16
Thus, acceleration of the particle is given by,
a = 12t - 16
Answer:
Apparent
The key discovery about Cepheid variable stars that led in the 1920s to the resolution of the question of whether spiral "nebulae" were separate and distant galaxies or part of the Milky Way Galaxy was the direct relationship between the pulsation period and the absolute brightness or luminosity of the Cepheid variables. A measurement of apparent brightness of a variable star could then be used to determine the distance to the "nebula" containing it.
Explanation:
A variable star is a star with changing apparent brightness. The changes can occur over years or in a fraction of seconds. For example the sun whose energy output varies by approximately 0.1 percent of its magnitude, over an 11-year solar cycle. This variable(apparent brightness) can be used to determine how far a variable star is (distance). Therefore, a measurement of apparent brightness of a variable star could then be used to determine the distance to the "nebula" containing it.
Answer: (1) Putrefaction
(2) Biodegradable
(3) Refuse.
Putrefaction refers to <u>decomposition of organic substances</u> usually dead plants' and animals' bodies <u>by microorganisms</u>.
Therefore, it matches with first definition that states the decay of organic matter caused by microorganisms.
Biodegradable substances are <u>decomposed by living organisms such as microorganisms.</u>
Therefore, it matches with the second definition that states susceptible to decomposition by living organisms.
Refuse refers to something which is <u>no longer useful</u>.
Therefore, it matches with the third definition of waste.