C. easier to build than a refracting telescope
Big mirrors used in reflecting telescopes are easier and cheaper to make than big lenses which would cost more because of the quality of glass required to make refracting telescopes
Answer:
Check explanation.
Explanation:
Net force is essentially the sum of the forces enacting upon an object. One example of net force is gravity and normal force. It is commonly accepted that every object has a force acting upon it, even if it is stationary. To give an example, the weight of an object has a force upon the earth but the earth pushes back, essentially meaning that the object will not sink.
Answer:
It takes the Moon 27.3 days to complete a single orbit around Earth.
Explanation:
This question seems to really be incomplete. You must include the options but fortunately I have already encountered this problem.
Here are the choices:
<span>A. have a different frequency than the resultant wave.
B. be in phase with each other.
C. be traveling in the opposite direction of the resultant wave.
D. have a different wavelength than the resultant wave
The correct answer is letter B. be in phase with each other</span>
Answer:
A) False B) True C) False D) False E) False
Explanation:
A) At any point of time half of the moon is always illuminated by the sun. We are able to see only the part of the moon which is facing us.
B) Typically a Lunar cycle phases take 29.5 days to complete one cycle i.e. it will take 29.5 days for one event say full moon to reoccur. So except for February all the other month can have two full moons.
C) As explained in the above answer any month except February can have two full moons.
D) The tame taken between new moon is 29.5 days.
E) Full moon always rises at the sunset and sets at the sunrise
