PHYSICS HIGH SCHOOL

What causes a magnetic field to form around certain metals, such as iron?a. The majority of the domains are aligned.
b. The majority of the protons are aligned.
c. The majority of non-metal atoms are aligned.
d. The majority of the atoms have been acted upon by gravity.

Answers

Answer 1
Answer: The correct answer is a

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How is energy lost from the photosphere of a protostar replaced?

Answers

Energy radiated from the surface of a protostar  which is inreturn is replaced by energy released through gravitational contraction. 

This keeps a protostar in thermal equilibrium

hope it helps

Under what conditions can light be modeled like a ray? Like a wave?

Answers

when the aperture or object size is equivalent to the wavelength of light

Asteroids are larger than

Answers

Asteroids are larger than comets, you, me, and meteoroids.
asteroids are larger than a house, a molecule, a car, a fish, an Iphone, and etc...

A bicycle travels 15 km in 30 minutes. What it's is average speed in km per hour

Answers

average speed is 0.5 km per hour

Answer:

30 km/h

Explanation:

Parallel light waves hit the surface of a still lake and reflect in the same direction. Which interaction of light and matter does this illustrate?

Answers

Parallel light waves hit the surface of a still lake and reflect in the same direction and the interaction of light and matter that it illustrates is called regular reflection. Regular reflection occurs whenever the reflecting surface is very smooth. The surface of the still lake is smooth. I hope the answer helps you.

Answer:

regular reflection

Explanation:

Gradpoint

You are on roller blades on top of a small hill. Your potential energy is equal to 1,000.0 joules. The last time you checked your mass was 60.0 kilograms.
a. What is your weight in newtons?
b. What is the height of the hill?
c. If you start skating down this hill, your potential energy will be converted to kinetic energy. At the
bottom of the hill, your kinetic energy will be equal to your potential energy at the top. What will be
your speed at the bottom of the hill?

Answers

a) The weight of a person is given by:
W=mg
where m is the mass of the person and g is the gravitational acceleration. In this problem, the mass of the person is m=60.0 kg, while the value of g is g=9.81 m/s^2, therefore the weight of the person is 
W=(60 kg)(9.81 m/s^2)=588.6 N

b) The gravitational potential energy at the top of the hill is U=1000 J. The potential energy is also given by the product between the weight W and the height of the hill h:
U=Wh
If we rearrange the equation, we can calculate the height of the hill, h: 
h= (U)/(W) = (1000 J)/(588.6 N) =1.70 m

c) At the bottom of the hill, all the potential energy at the top of the hill has converted into kinetic energy:
U=K
U= (1)/(2) mv^2
where m is the mass and v is the speed. If we rearrange the formula, we can calculate the speed at the bottom of the hill:
v=\sqrt{(2U)/(m)}=\sqrt{(2\cdot 1000 J)/(60.0 kg)}=5.8 m/s
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Срочно нужно решение задания 5, пожалуйста!!!!!
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