If a star appears to move relative to other stars over a one-year period, this motion is due to the star's true space motion.
What is the proper motion of stars?
Proper motion is the angular change in position of a star across our line of sight, measured in arc seconds per year, and symbolized with the letter μ.
Proper motion is generally measured by measuring the movement of the image of a star with respect to more distant background stars over that time period.
Here we are told that star appears to move relative to other stars over 1 year period.
So we know that,
True space motion is the annual apparent motion of a star across the sky.
True Space Motion is Combination of radial velocity, proper motion, and distance.
Hence,
If a star appears to move relative to other stars over a one-year period, this motion is due to the star's true space motion.
Learn more about motion of stars here:
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Answer:
Adding heat makes the particles move faster so the particles have more kinetic energy when more thermal energy is added
Explanation:
Answer:
Hydrogen peroxides are known to be an active ingredient in hair dyes. Hydrogen peroxide is a damaging chemical although it has been added in diluted amounts in hair dyes. Some hair dye companies have already started looking for alternatives for hydrogen peroxide to use in their products, concerning the damaging effects of the chemical.
Hydrogen peroxide can cause hair loss, dermatitis and scalp burns.
Concerning the harmful chemicals in dyes, many people consider it is best to use henna if you really want a colour change for your hair.
Answer: 63 miles per hour
i think
Explanation:
Question:
a. If Sr-90 has a half life of 28 years, how much Sr-90 remains?
b. How much total mass remains (Sr-90 and more stable isotopes combined)?
c. What quantity of more stable isotopes exist?
Answer:
a. 25/64 grams
b. 400 g
c. 399.61 g
Explanation:
The formula for calculating half life is as follows;
Where:
N(t) = Quantity of the remaining substance
N₀ = Initial radioactive substance quantity = 400
t = Time duration = 280 years
= Half life of the radioactive substance = 28 years
a. Plugging in the values we have;
Therefore, the amount of Sr-90 that remains after 280 years is 25/64 or 0.391 grams
b. The amount of the total mass that remains is constant = 400 g
c. The quantity of the more stable isotopes that exits is therefore, 400 - 0.391 = 399.61 grams