Answer:
D)
Explanation:
The Period-Luminosity relationship tells us that luminosity increases with the period, and of course the more luminosity a star has the more far away they can be seen, so from this we know that:
A) False since lower luminosities can be observed when they are close.
B) False since longer periods means higher luminosities
C) False since lower luminosities can be observed when they are close.
D) True: Variable stars with shorter periods have lower luminosities, so they can only be observed when they are close.
the force that resists the movement of a solid object through a fluid (liquid or gas). Hope this helps.
Answer:
Pressure is a quantity that may be measured in a variety of units such as atm and bar. However, the Pascal is used to measure pressure in the SI system. One Pascal is the pressure exerted perpendicularly on an area of one square meter by a force of magnitude one Newton.
. In single particle problem whole mass is concentrated at a single point so it has a single displacement, single velocity and single acceleration. while, in rigid body mass is distributed
Answer:
<h2>2000 J</h2>
Explanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
PE = 10 × 10 × 20 = 2000
We have the final answer as
<h3>2000 J</h3>
Hope this helps you