All categories

3 years ago

Which of these stars has the coolest surface temperature?A. A starB. F starC. G starD. K star

Physics

2 answers:

morpeh [17]3 years ago

7 0

Answer:

D. K star

Explanation:

Stars are classified into different groups according to their peak wavelength and their surface temperature.

In particular, we have the following group of stars, which correspond to the following surface temperatures:

Group O - Temperature > 25,000 K

Group B - Temperature 11,000 - 25,000 K

Group A - Temperature 7,500 - 11,000 K

Group F - Temperature 6,000 - 7,500 K

Group G - Temperature 5,000 - 6,000 K

Group K - Temperature 3,500 - 5,000 K

Group M - Temperature < 3,500 K

So among the options given, the star with the coolest surface temperature is star in group K.

Lostsunrise [7]3 years ago

7 0

Answer:

D. K star

Explanation:

You might be interested in

What is the size of the smallest vertical plane mirror in which a 5.0 ft tall kangaroo standing erect can see her full-length im

kati45 [8]

Answer:

iskidkdikdxidkzodkxkziskkkssisi

Explanation:

go see a pic with my mouth to get it over there was homework to call me if I can I can hear it bro I'm dillo of me I hope to see if it would work with you to the person I would love with the same thing I was gonna to do with it I can send a picture it's for you guys and he will get my job done in time I think of it like the last few weeks lol but I'm just gonna start working out with you to the adio of u up here is very important that we have been working in his room for me in my mom and then we are u doing well I'm better off with

8 0

3 years ago

Question 19 D

Elena L [17]

The answer of this question would be D

6 0

3 years ago

(a) Convert 46.0° to radians.

jeyben [28]

The answers are :

(a) 23π/90 radians ≈ 0.803 radians

(b) 17/2π revolutions ≈ 2.706 revolutions

(c) 79.5/60 rad/s = 13.25 rad/s

*The important formulas to remember*

Degrees to Radians

$\boxed {Radian = Degree \times \frac{\pi}{180^{o}}}$

2. Radians to Revolutions

$\boxed {Revolution = \frac{Radian}{2\pi}}$

3. rpm to rad/s

$\boxed {rad/s = \frac{rpm}{60}}$

4 0

2 years ago

In the picture below, sphere X swings down and collides with sphere Y. Identify the action and reaction forces.

matrenka [14]

Answer:

Action force is force acting in one direction. Reaction force is force acting in the opposite direction.

8 0

3 years ago

An electric motor is used to hoist building supplies from the ground to the roof of a building. How much work can the motor do i

Alexeev081 [22]

Answer:

18000 J is the work can do by the motor.

Explanation:

If an electric motor works for 12 seconds and the power output is 1.5 KW = 1500 Watts we need to find how much work can an electric motor does.

We know that,

“Power” is defined as the “rate” of doing “work”, the “energy” transferred or converted per unit time. Mathematically, $\text { power }=\frac{\text {work}}{\text { time }}$

Where, units of power is “Watt”, units of work is “Joule” and time in “seconds”.

Substitute the given values to find work

$1500=\frac{w o r k}{12}$

1500 × 12 = work

Work = 18000 Joules

Therefore, work can done by an electric motor is 18000 J.

5 0

4 years ago