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the equivalence principle, general relativity Questions with Solutions
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the equivalence principle, general relativity
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the equivalence principle, generalrelativity
If you travelled to the center of our galaxy and back at 99.99999999999% of the speed
of light, - answer you would age about 8 days, but Earth would age 50,000 years!
(Because time goes more slowly)
the four fundamental forces of nature - answer Gravity
Electromagnetism
Strong nuclear force
Weak nuclear force
1. Strong nuclear force - answerStrength:
1
Range:
10^-15
Function:
Holds atomic nuclei together
2. electromagnetism - answerany force you feel besides gravity
Strength:
1/137
Range:
Infinite
Function
Makes atoms cling to each other
3. Weak nuclear force - answerStrength:
10^-5
Range:
10^-17 m
, Function:
Breaks atoms apart
4. gravity - answerStrength
10^-39
Range:
Infinite
Function:
Makes masses attract one another
are Stars on one side of our galaxy affected by the gravitational pull of stars on the
other side? - answeryes
In a universe which is empty except for you and a baseball, and you throw a baseball,
ignoring the effect of gravity what will happen? - answerthe baseball will move away
from you at constant speed
When the baseball loses contact with your hand - answerit stops accelerating (newtons
second law)
what will happen if you throw the ball? - answerit will cause you to move in the opposite
direction but slower (third law)
newton's first law - answerObjects move with constant speed and direction unless acted
upon by an external force
newton's second law - answerforce=mass x acceleration
acceleration= force/mass
Newton's third law - answerIf one body exerts a force on another, the other body will
exert a force of equal strength but opposite direction
What keeps the moon in orbit around the earth? - answerEarth is pulling on the moon,
and the moon equally pulls on the earth
newton's law of gravity - answerF g = G x M x m / r^2
This applies for every pair of objects in the universe
The force is equal but the effect depends on the mass (bigger mass, more gravity)
From 1687 until 1916, newton's description of gravity held sway
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