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:
sunspots
Sunspots are areas in the sun that has a magnetic field is about 2 thousand times stronger than Earth's. Also is much higher than anywhere else on the Sun.
Answer:
9.67 A
Explanation:
We want the magnetic force on the wire to be equal to the weight of a student of mass m=75 kg. The magnetic force on the wire is given by
where
I is the current in the wire
L = 2.0 m is the length of the wire
B = 38 T is the magnetic field
is the angle between the direction of B and L
While the weight of the student is
where g=9.8 m/s^2 is the acceleration due to gravity.
The problem can be solved by equalizing the two forces: W=F. So we can write
And solving for I, the current, we find
Answer:
The Sun and planets are shown to the same scale. The small terrestrial planets and tiny Pluto are in the box---the Earth is the blue dot near the center of the box (montage created by Nick Strobel using NASA images).
Size
The Sun is by far the biggest thing in the solar system. From its angular size of about 0.5° and its distance of almost 150 million kilometers, its diameter is determined to be 1,392,000 kilometers. This is equal to 109 Earth diameters and almost 10 times the size of the largest planet, Jupiter. All of the planets orbit the Sun because of its enormous gravity. It has about 333,000 times the Earth's mass and is over 1,000 times as massive as Jupiter. It has so much mass that it is able to produce its own light. This feature is what distinguishes stars from planets.
Composition
What is the Sun made of? Spectroscopy shows that hydrogen makes up about 94% of the solar material, helium makes up about 6% of the Sun, and all the other elements make up just 0.13% (with oxygen, carbon, and nitrogen the three most abundant ``metals''---they make up 0.11%). In astronomy, any atom heavier than helium is called a ``metal'' atom. The Sun also has traces of neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, potassium, and iron. The percentages quoted here are by the relative number of atoms. If you use the percentage by mass, you find that hydrogen makes up 78.5% of the Sun's mass, helium 19.7%, oxygen 0.86%, carbon 0.4%, iron 0.14%, and the other elements are 0.54%.
Explanation:
The momentum conservation allows to find the final speed of the cars together are:
- If the second car is stopped, the final speed is: v = vo / 2
- If the second car moves towards the first, the final speed is: v = 0
The momentum is defined by the product of the mass and the speed of the body.
p = m v
Where the bold letters indicate vector, p is the moment, m is the mass and v the velocity.
If we define the system as formed by the two bodies, the forces during the collision are internal and the momentum is preserved, let's find the moment in two instants.
Initial instant. Before crash.
p₀ = m v₀₀₀+ m v₀₂
Final moment. After the crash.
The moment is preserved.
We have two cases:
- That the second car is initially stopped, therefore the speed is zero
v = v₀ / 2
- That the second car move towards the first with velocity v₀₂ = - vo
v = 0
In conclusion using the momentum conservation we can find the final velocity of the cars together are:
- If the second car is stopped, The final speed is: v = vo / 2
- If the second car moves towards the first, the final speed is: v = 0
Learn more here: brainly.com/question/3920210