PHYSICS HIGH SCHOOL

The majority of visible stars are _____ stars.a. neutron
b. red giant
c. white dwarf
d. main sequence

Answers

Answer 1
Answer:

Answer:

The correct answer is D. The majority of visible stars are main sequence stars.

Explanation:

The Main Sequence in a Hertzsprung-Russell diagram is a curve along which most stars are. A star in the main series is called a Main Sequence star.

The sun is an example of a main series star: it has been there for about 4.5 billion years and will continue so for another about 4.5 billion years. After the hydrogen in the core of the sun has been consumed, it will begin to burn helium, swell and become a red giant star.
Answer 2
Answer: The majority of visible stars are neutron stars. The answer is letter A. The rest of the choices do not answer the question above.

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A 20.0-cm long pipe is covered at one end in order to create a closed-end air column. A vibrating tuning fork is held near its open end, forcing the air to vibrate in its first harmonic. The wavelength of the standing wave pattern is ____.

Answers

Answer:

80 cm

Explanation:

the given condition is closed-end air column. The wavelength is four times the length of the air column for the standing wave pattern for the first harmonic.  

The required wavelength of the standing wave pattern is

=\lambda =4L\n\lambda=4 * 20\n\lambda=80 cm

If the velocity of an object is changing, its momentum is also changing. true or false 

Answers

It is absolutely true that when the velocity of an object changes, the momentum of the object also change. Momentum of any object is defined as the multiple of velocity of an object and the mass of the object. So we can easily deduce that momentum is directly proportional to velocity of an object if the mass of the object remains constant. So it can be seen that if the mass of the object does not change then any change in velocity is bound to have an effect on the momentum of the object. We can easily write the equation as momentum= mass x velocity.


The _______scale is called an absolute temperature scale, and its zero point is calledabsolute zero.
O A. Celsius
O B. Fahrenheit
O C. Kelvin

Answers

Answer:

It is C the kelvin scale

Explanation:

Have a great day

What is the difference between electric motor and electric generator?

Answers

Electric motor convert electrical energy into machenical energy & electric generater convert mechanical energy into electrical energy...
An electric motor uses electricity as power, an electric generator creates electricity.

(01.01 LC)Two objects of the same mass are in a room. At which of the
following distances will the greatest gravitational force be exerted
by one object on another?
O 2 m
O 4 m
O 6 m
O 8 m

Answers

Answer:

2m

Explanation:

The closer the objects are, the more gravitational force there is

Answer:

2m

Explanation:

its the shortest distance so its corect

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an empty propane tank dropped from a hot air balloon hits the ground with a speed of 143.8 m/s. from what height was the tank released?

Answers

What you know:
Vi=0m/s
Vf=143.8m/s
A=-9.8m/s
d=???
Use the equation Vf^2=Vi^2+2A(d)
Rearrange to isolate d: d=Vf^2/2A
d=(143.8)^2/2(-9.8)
d=20678.4/-19.6
d=-1055m
The tank was released from a height of 1055m
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