Answer:
giants has a higher luminosity
Explanation:
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.Giant stars have radii up to a few hundred times the Sun and luminosity between 10 and a few thousand times that of the Sun.
While a white dwarf is a small, very dense, hot star that is made mostly of carbon. These faint stars(less luminous) are what remains after a red giant star loses its outer layers. Their nuclear cores are depleted. They are about the size of the Earth (but tremendously heavier)
Answer:
Explanation:
Given that
Mass of disc,M=3 kg
radius r= 65 cm
Mass of small mass ,m=0.07 kg
Initial speed = 2.2 rev/s
If external torque is zero then angular momentum of system will remain conserve.
Moment of inertia of disc at initial condition
Moment of inertia of disc at final condition
So from conservation of angular momentum
This is final speed of disc after small mass flies off from the disc.
Answer:
<em>The equivalent resistance of the combination is R/100</em>
Explanation:
<u>Parallel Connection of Resistances</u>
If resistances R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:
The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.
It's known the 10 parts or resistance R/10 were connected in parallel, thus the electric resistance is:
Note the sum consists of 10 equal terms. Operating on each term:
The sum of 10 identical fractions yields 10 times each fraction:
Solving for Re needs to take the reciprocal of both sides of the equation:
The equivalent resistance of the combination is R/100
Answer:
Explanation:
a ) for the pilot to feel weightless , his weight will provide the centripetal force . The reaction force from airplane will be zero.
mg = mv² / r
g = v²/r
v² = gr
= 9.8 x 200
v = 44.27 m / s .
b )
v = 280 km / h
v = 77.77 m /s
If R be the reaction force of floor of airplane on him
R - mg = mv² / r
R = mg + m v² / r
= 700 + 70 x 77.77² / 200 ( m = mg / g = 700/ 10 = 70 )
= 700 + 2116.86
= 2816.86 N .