I need a equation for a problem in using a pulling force a mass a coefficient of static friction a coefficient of kinetic friction and solving for the frictional force

Answers

Answer 1
Answer: The minimum pulling force required to start it moving is
equal to the static frictional force.

F = (mass) x (gravity) x (coefficient of static friction).


Once it's moving, the force required to keep it moving at a steady speed,
without speeding up or slowing down, is the force of kinetic friction.

F = (mass) x (gravity) x (coefficient of kinetic friction).


In both equations, [ (mass) x (gravity)] is just the object's 'weight'.




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An apple falls to the ground due to: (A) frictional force. (B) muscular force. (C) gravitational force. (D) electrostatic force.

Answers

The answer is (c) an apple falls to the ground due to gravitational force

What is the total magnification of a microscope with two lenses when one lenses has a magnification of 15 and the other lens has magnification of 30- 15

- 30

- 45

- 450

Answers

Answer:

45 easy and if u ever need anything holla

Which best describes how DNA is used as a molecular clock?The number of mutations in DNA is compared between two species.
The total amount of DNA is compared between two species.
The percent of carbon in DNA is compared between parent and offspring.< The total mass of DNA is compared between parent and offspring.

Answers

The answer that best describes how DNA is used as a molecular clock is the number of mutations in DNA is compared between two species. 

Answer:

The correct answer is a = The number of mutations in DNA is compared between two species.

Explanation:

Hello ! Let's solve this!

The molecular clock is a technique to see the divergence between two species. In other words, to see DNA mutations.

The correct answer is a = The number of mutations in DNA is compared between two species.

Name three devices that can store electric potential energy

Answers

Potential energy, unlike kinetic, is stored energy. This energy comes from different sources. An object with potential energy also has the ability to produce energy if something triggers it. Example, a charged battery, a car on top of a hill, and capacitors.

Which characteristic should a good scientific question have?

Answers

Answer:

explained

Explanation:

A Good scientific question must lead to a hypothesis and must help in answering the reason for any observation. It should be testable, meaning it can be performed as an experiment. At the same time the formed hypothesis can be falsifiable, that is it can fail. For example, the sound generated by a moving car. The question can be is there any correlation between speed of car and the noise it generate. It can result in a hypothesis that at higher speed more noise occur. It can very easily tested.

A good scientific question should be pre-determined and also have a meaning or relation to science. 


How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it? I tried the answer "b." and that's not the right answer I guess.a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

b. Physicists develop mathematical equations to determine its physical nature.

c. The Big Bang theory provides the scientific guidelines to enable its study.

d. Scientists are able to gather samples from NASA.

Answers

Answer: a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Explanation:

Scientists cannot physically test their ideas about the origin of the universe but they use cosmological principles to study. Some aspects of the assumptions made on the basis of cosmological principle can be tested. Whatever was formed at the origin of the universe is present around us. Studies are made on them and conclusions are drawn.  

Cosmological principle states that on larger scale, the universe is homogeneous and isotropic. This means in which ever direction we look, its the same and there is no preference to any particular direction to make observations.

There are numerous theories associated with the origin of the universe but none can be proved. The theories can only be studied based on the assumptions made using the cosmological principle.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it?

a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Hope this helps.