PHYSICS HIGH SCHOOL

Which best compares a brush and a commutator in an electric motor?

Answers

Answer 1
Answer: The purpose of the brush is supposed to be to lessen the amount of damage or wear placed upon the motor. I hope this helps with your answer choices since you did not post any.

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Doing a warmup before exercise is important because it

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Doing a warm-up before exercise is important because it strengthens your body and gets your body ready for the exercise you are about to do. If you do not do a warm-up, your body may grow tired a bit more quickly.

Hope this helped!

With an average surface temperature of about 737 K, _______ is the hottest planet.A. Venus
B. Mercury
C. Mars
D. Earth

Answers

With an average surface temperature of about 737 K, Venus is the hottest planet.

While Mercury is closest to the sun, it has gaseous molecules that protect it. Venus is the second closest planet to the sun, and is the hottest planet.

With an average surface temperature of about 737 K, VENUS is the hottest planet.

Differentiate elastic potential energy and chemical potential energy​

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Answer: Elastic energy is the energy store in a.. compacted spring; an extended elastic band; and a drawn bow.  

Chemical potential energy​​ is position of electrons in specific substance bonds that can be broken (energizes).

:

This stored energy is released and performs work when the elastic material reverts back to its original position. ... In comparison, chemical potential energy, is the energy released during the formation of chemical compounds.

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

Answers

Assuming this is a neutral atom, protons = electrons = atomic number
Since there are 8 positively charged particles or protons, there are also 8 electrons and that element's atomic number is 8. Neutrons is atomic mass minus atomic number which is 7 neutrons in this case.This element is therefore oxygen.

Answer:

A.) The atom has 7 neutrons and 8 protons.

Explanation:

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You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (if you run any faster, you’ll be caught for running). How much time will it take to get to your class?

Answers

200/1.5 = 133.33 seconds. 

= approximately 2 mins and 13 secs. 
Time = distance / velocity

= 200/1.5

= 133.3333 s.

Thus, the time will be around 133 seconds or 2 minutes 13 seconds.

In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge 2e and mass 6.64 10-27 kg, is a product of certain radioactive decays. The results of the experiment led Rutherford to the idea that most of an atom's mass is in a very small nucleus, with electrons in orbit around it. Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 1.50 107 m/s directly toward the nucleus (charge 79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction?

Answers

Answer:

Explanation:

We shall apply conservation of mechanical energy

kinetic energy of alpha particle is converted into electric potential energy.

1/2 mv² = k q₁q₂/d , d is closest distance

d = 2kq₁q₂ / mv²

= 2 x 9 x 10⁹ x 79e x 2e / 4mv²

= 1422 x2x (1.6 x 10⁻¹⁹)² x 10⁹ /4x 1.67 x 10⁻²⁷ x (1.5 x 10⁷)²

= 3640.32 x 10⁻²⁹ /2x 3.7575 x 10⁻¹³

= 484.4 x 10⁻¹⁶

=48.4  x 10⁻¹⁵ m

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