Answer:
Its fine. You can ask me if you need help, and I can answer it.
While rotating around Earth the Moon also rotates around it's axis. These two rotations have almost same duration (27.3 and 27 days respectively). This is the reason why we always see the same side of Moon.
The dark part of a Moon is the part where there is night on the Moon, meaning there is no sunlight visible. This dark part depends on the Moon's position relative to Earth and Sun. The change in size is due to part of Moon-day. Dark part of Moon has night, bright part has day and the boundary has either sunrise or sunset.
Answer:
The wavelength of the sound the person observes will be longer than it was, and the frequency will also be lower than it was.
Explanation:
From Doppler effect we know that
f_L= frequency observed by the listener
f_s= frequency of the source
v= velocity of sound
Vs= velocity of source
Vo= velocity of observer
so
when the Source( car siren) moves away, Vs increases and the factor (V -Vs)(V +V_0) decreases
thus f_L also Decreases
option C it is
A. They are larger with more moons.
Answer:
29.2 m/s
Explanation:
The escape velocity of an object from the surface of a planet is given by:
where
G is the gravitational constant
M is the mass of the planet
r is the radius of the planet
In this problem, we have
is the mass of the Death Star
is its radius
Substituting into the equation, we find