1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
klasskru [66]
3 years ago
12

The term 'Zero Age Main Sequence' refers to the time when a new star stops contracting and hydrogen fusion starts.A. TrueB. Fals

e
Physics
1 answer:
mash [69]3 years ago
6 0

Answer:

True

Explanation:

When a star has reached the main sequence stage, hydrogen is converted into helium by nuclear fusion, . Also, the gravity and pressure are balanced because the star does not radiate more heat than it generates. A star usually spends most of its lifetime at this stage.

The Zero Age Main Sequence is the period during the main sequence when a star stops contracting, and begin to fuse hydrogen in its core.

You might be interested in
A car is travelling down a road. A displacement vs. time graph for the car is shown below. What is the velocity of the car 6 s i
Kruka [31]

May you attach your displacement vs. time graph picture and resend the question once again then I might be able to help you

8 0
3 years ago
Suppose you pour water into a container until it reaches a depth of 12 cm. Next, you carefully pour in an 8.5 cm thickness of ol
Phantasy [73]

Answer:

the pressure at the bottom is approximately 103264 Pa

Explanation:

From Pascal's law, the pressure at the bottom of the container is the pressure from the atmosphere and the columns of water and olive , therefore

Pressure at the bottom = Pressure at the surface of the liquid ( atmospheric pressure) + pressure of the column of water + pressure of the column of olive oil

since

- Pressure at the surface of the liquid = atmospheric pressure = 101325 Pa

- pressure of the column of water = density of water * gravity * level of water

= 1000 kg/m³ * 9.8 m/s² * 0.12 m = 1176 Pa

- pressure of the column of olive oil=  density of olive oil* gravity * level of olive oil = 916 kg/m³ * 9.8 m/s² * 0.085 m = 763 Pa

therefore

Pressure at the bottom = 101325 Pa + 1176 Pa + 763 Pa = 103264 Pa

density of olive oil was taken from internet sources ( we can check that is lower than the one of water, and thus it floats )

3 0
3 years ago
Which of these is largest? A. asteroids B. comets C. meteoroids D. planets
lys-0071 [83]
Planets are the largest among the list. Take Jupiter or Saturn for example.
5 0
3 years ago
Read 2 more answers
Djejfje kdjejfjeofjod fjdidjskd.jdjdjdjdp
Mariana [72]

YUHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH gbghdwqygfywefyugsadfyuyuqwbhfbds       hehrwuhuaijkfa

5 0
3 years ago
A 10-cm-thick aluminum plate (α = 97.1 × 10−6 m2/s) is being heated in liquid with temperature of 475°C. The aluminum plate has
Anuta_ua [19.1K]

Answer:

T_0 = 338.916 Degree\ celcius

Explanation:

Given data:

Thickness of aluminium sheet 10 cm

initial temperature = 25 degree celcius

Assumption

Thermal properties remain constant, transfer of heat by radiation is negligible.

from the information given in the question we have

T_S ≈T_∞ , it implies we have h → ∞

from table 4.2 Biot number → ∞ the value of

\lambda_1 = 1.5708 and A_1= 1.2732

The fourier number is

t = \frac{\alpha t}{l^2} = \frac{97.1\times 10^{-6} \times 15}{0.05^2} = 0.5826

Temperature at center after 15 second of heating

\theta _{0 wall} = \frac{T_0 - T_{\infity}}{T_i -T_{\infity}} = A_i e^{\lambda_1^2 t}

T_0 = T_i -T_{\infity} \times A_i e^{\lambda_1^2 t}

T_0 = (25 - 475) 1.2732 e^{-1.5708^2 \times 0.5826} +  475  = 356 degree celcius

T_0 = 338.916 Degree\ celcius

8 0
3 years ago
Other questions:
  • Find the probability of at least three
    15·1 answer
  • Which state law would be considered unconstitutional based on the Fourteenth Amendment?
    5·1 answer
  • According to car and driver, an alfa romeo going at 70 mph requires 177 feet to stop. assuming that the stopping distance is pro
    6·1 answer
  • Why would your weight be different on the moon than on earth?
    14·1 answer
  • Which is the appropriate unit of measurement for pitch?
    15·2 answers
  • Protons and neutrons are composed of...<br> A.molecules<br> B.ions<br> C.quarks<br> D.electrons
    14·2 answers
  • If the spinning speed of the earth is increased, then the weight of the body at equator
    9·1 answer
  • A solo trumpet in an orchestra produces a sound intensity level of 84 db. fifteen more trumpets join the first. how many decibel
    5·1 answer
  • A wire with mass 50 g is stretched so that it’s ends are tied down at points 100 cm apart. The wire vibrates in its fundamental
    9·2 answers
  • Explain why our sweat is salty?​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!