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
Alex73 [517]
3 years ago
11

The parallax method of measuring star distances gives most accurate results when the gap between two observations of a star is a

bout six months. Which of these statements best explains why a gap between observations affects the accuracy of the star distance?
a. It allows the star to complete its life cycle and evolve from one form to another.
b. It ensures that measurements are taken from two points which are very far apart.
c. It makes up for the changes in the star's position due to its movement around the sun.
d. It helps to take the measurement of changes in the position of the star due to supernova explosions.
Physics
2 answers:
EleoNora [17]3 years ago
8 0
<span>b. It ensures that measurements are taken from two points
that are very far apart.

Measurements taken six months apart are the farthest apart
that an astronomer can ever get ... they're on opposite sides
of the Earth's orbit !</span>
Ronch [10]3 years ago
5 0

Answer:

b). It ensures that measurements are taken from two points which are very far apart.

Explanation:

In parallax method of measurement of the distance of far or distant objects we know that we use the method of distance geometry

It is given as

angle = \frac{arc}{radius}

now we have

Arc = distance between two positions from which angle is measured

Angle = total angle subtends by the planet at two positions

radius = distance of the planet

so we will have

distance = \frac{arc}{angle}

so here if we ensure large arc length then the error in the measurement of the angle will be small and the distance will be accurate.

You might be interested in
A 30 kg mass and a 20 kg mass are joined by a light rigid rod and this system is free to rotate in the plane of the page about a
stepan [7]

55 J

Explanation:

Kinetic energy is given as: 0.5MV^2 where M is the mass and V is the speed of rotation. Since the masses are point masses, we calculate the point mass for each mass.

M1 = 30*0.2^2 = 1.2kgm^2

M2 = 20*0.4^2 = 3.2kgm^2

V = 5 rad/s

Calculating using the formula above, we obtain :

0.5(1.2+3.2)5^2 =0.5*4.4*25 = 55 J

3 0
3 years ago
Read 2 more answers
How does a sound wave transfer energy to your ears?
inessss [21]

Answer:

I think it's C!

Explanation:

Sound waves travel at 343 m/s through the air and faster through liquids and solids. The waves transfer energy from the source of the sound, e.g. a drum, to its surroundings. Your ear detects sound waves when vibrating air particles cause your eardrum to vibrate. The bigger the vibrations the louder the sound.

Hope this helps!

4 0
3 years ago
A 2 kg ball is thrown upward with a velocity of 15 m/s. What is the kinetic energy of the ball as it is being thrown?
marusya05 [52]
KE=1/2 m v^2
KE= .5 x 2kg x 15m/s to the 2nd power
KE=225 km/s
7 0
3 years ago
Read 2 more answers
At a distance r from a charge e on a particle of mass m the electric field value is
mel-nik [20]

At a distance r from a charge e on a particle of mass m the electric field value is  8.9876 × 10⁹ N·m²/C². Divide the magnitude of the charge by the square of the distance of the charge from the point. Multiply the value from step 1 with Coulomb's constant.

<h3>what is magnitude ?</h3>

Magnitude can be defined as the maximum extent of size and the direction of an object.

It is used as a common factor in vector and scalar quantities, as we know scalar quantities are those quantities that have magnitude only and vector quantities are those quantities have both magnitude and direction.

There are different ways where magnitude is used Magnitude of earthquake,  charge on an electron, force, displacement, Magnitude of gravitational force

For more details regarding magnitude, visit

brainly.com/question/28242822

#SPJ1

7 0
1 year ago
A car travels in a straight line covering a total distance of 90.0 miles in 60.0 minutes. Which one of the following statements
andrezito [222]

Answer:

E) The average velocity of the car is 90.0 miles per hour in the direction of motion.

Explanation:

Given;

distance covered by the car, d = 90 miles

time taken, t = 60 minutes = 1 hour

The average velocity of the car is given by change in displacement per change in time;

V = Δd / Δt

V = \frac{x_f - x_o}{t_f -t_o} = \frac{90-0}{1-0} \\\\V = 90 \ miles/hour

Therefore, the average velocity of the car is 90.0 miles per hour in the direction of motion.

7 0
2 years ago
Other questions:
  • A 7-hp (shaft) pump is used to raise water to an elevation of 19 m. if the mechanical efficiency of the pump is 82 percent, dete
    12·1 answer
  • What is the amount of heat, in Sl units, necessary to melt 1 lb of ice?
    5·1 answer
  • Albert views Henry moving by at a constant velocity. Henry has a light clock and also a stopwatch which were synchronized when a
    11·1 answer
  • A bowling ball has a mass of 5 kg. What happens to its momentum when its speed increases from 1 m/s to 2 m/s?
    12·1 answer
  • Find out the x-component and y-component of the following vectors:
    13·2 answers
  • What components of the atom are found outside of the nucleus? protons electrons neutrons all are found in the nucleus
    11·2 answers
  • Can someone help me please
    12·1 answer
  • First right is brainliest, plz help:)
    12·1 answer
  • What is the full meaning of ROYGBIV?​
    6·2 answers
  • One of the possible criteria of Schizophrenia is hallucinations.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!