A plane mirror doesn't change the apparent size or shape of things.
-- If the meter stick is held parallel to the mirror, or is lying on the mirror,
then its image in the mirror is 1 meter long.
-- If the meter stick is held perpendicular to the mirror, or is standing on
the mirror, or pointing directly at it, then its image in the mirror has no length.
Sin/Cos if that's one of the answers. you have to use trig because you must resolve into components.
Explanation:
Let's say your mass is M, the ball's mass is m, and the ball's speed is v. Let's say your final speed is V.
Momentum is conserved. If you catch the ball, your speed is:
mv = (m + M)V
V = mv / (m + M)
If you deflect the ball, your speed is:
mv = MV + m(-v)
V = 2mv / M
To compare these, we need the common denominator.
If you catch the ball:
V = mMv / (M (m + M))
If you throw the ball:
V = 2m(m + M)v / (M (m + M))
Comparing the numerators, we can see M < 2(m + M), so catching the ball results in a lower speed.
Answer:
2.73 km/s
Explanation:
The escape velocity of an object in the gravitational field of the moon is (on the surface of the planet)
where
is the gravitational constant
is the mass of the Moon
is the radius of the Moon
As we can see, the escape velocity does not depend on the mass of the lunar module.
Substituting the numbers into the formula, we find
