Answer:
A)
2. very cool but very luminous
6. found in the upper right of the H-R diagram
B)
1. The majority of stars in our galaxy
5. the Sun, for example
7. a very hot and very luminous star
C)
3. not much larger in radius than Earth
4. very hot but very dim
Explanation:
Main-sequence stars :
Main-sequence stars are the star which having hydrogen in the core and also having stable inward and outward force.
White dwarfs :
This is also a star like the sun .The temperature of these type of star above 100,000 Kelvin.The mass of White dwarfs is less than the sun but slightly more than earth.
Red giant or supergiant stars :
This is the biggest star in the universe.When a star does not having hydrogen fuel in the core then Red giant or supergiant stars are formed.
A) 2 ,6
B) 1 , 5 ,7
C) 3 ,4
Answer:
For the force due to electromagnetism we use Coulomb’s inverse square law:
F=keq1q2r2
(where F is the electrostatic force, q1 & q2 are the two charges, r is the distance between them, and Coulomb’s Constant ke=14πϵ0=8.99×109Nm2C−2, where ϵ0 is the permittivity of free space)
r=keq1q2F−−−−−√
r=8.99×109Nm2C−2−1.60×10−19C×−1.60×10−19C1.0N−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−√
r=1.52×10−14m
Explanation:
First, we need to calculate for the height where the mailbag
was dropped.
h = 3.50 * t^3
at t = 1.75 s, h is:
h = 3.50 * (1.75)^3
h = 18.758 m
Then we can use the equation to solve for time:
h = v0t + 0.5gt^2
where v0 is initial velocity = 0, t = time, g =
acceleration due to gravity
18.758 m = 0 + 0.5 * (9.81 m/s^2) * t^2
t^2 = 3.8242
t = 1.96 s
<span>So the mailbag reaches the ground after 1.96 seconds</span>
Visible light
the part of the electromagnetic spectrum that the human eye is able to detect
Answer:
(a). The average power of the elevator motor during this time interval is 5903.6 W.
(b). The power input from motor is
Explanation:
Given that,
Mass of elevator = 650 kg
Time = 3.00 sec
Speed of the elevator = 1.75 m/s
We need to calculate the acceleration of elevator
Using formula of acceleration
(a). We need to calculate the net force on elevator is
Using formula of force
We need to calculate average velocity
Using formula of average velocity
We need to calculate the average power
Using formula of power
(b). We need to calculate the power input from motor
Using formula of power
Hence, (a). The average power of the elevator motor during this time interval is 5903.6 W.
(b). The power input from motor is