PHYSICS HIGH SCHOOL

PLEEASEEE HEELLPPPP !!!!!!!
PLEEASEEE HEELLPPPP !!!!!!! - 1

Answers

Answer 1
Answer: A. Gravity pushes down, normal force pushes up.

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A projectile has an initial horizontal velocity of 34.0 M/s at the edge of a roof top. Find the horizontal and vertical components of its velocity after 5.5sI need shown work !
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When you anticipate the results of your experiment before you begin, you are making a
A cheetah runs with a positive acceleration. What does this tell you about the velocity time graph for the cheetah?A. Graph negative slope B. graph positive slope C. Graph positive area D. Graph negative area

In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.03 106 m/s.(a) Find the force acting on the electron as it revolves in a circular orbit of radius 5.35 10-11 m.
whats the magnitude in N ?


(b) Find the centripetal acceleration of the electron.
whats the magnitude in m/s2

Answers

In order to answer these questions, we need to know the charges on
the electron and proton, and then we need to know the electron's mass. 
I'm beginning to get the creepy feeling that, in return for the generous
5 points, you also want me to go and look these up so I can use them
in calculations ... go and collect my own straw to make the bricks with,
as it were. 

Ok, Rameses:

Elementary charge . . . . .  1.6 x 10⁻¹⁹  coulomb
                                        negative on the electron
                                        plussitive on the proton

Electron rest-mass . . . . .  9.11 x 10⁻³¹  kg


a).  The force between two charges is

      F  =  (9 x 10⁹) Q₁ Q₂ / R²

          =  (9 x 10⁹ m/farad) (-1.6 x 10⁻¹⁹C) (1.6 x 10⁻¹⁹C) / (5.35 x 10⁻¹¹m)²

          =     ( -2.304 x 10⁻²⁸) / (5.35 x 10⁻¹¹)²

          =          8.05 x 10⁻⁸  Newton .


b).  Centripetal acceleration  = 

                                               v² / r  .

                  A  =  (2.03 x 10⁶)² / (5.35 x 10⁻¹¹)

                     =      7.7 x 10²²  m/s² .

That's an enormous acceleration ... about  7.85 x 10²¹  G's !
More than enough to cause the poor electron to lose its lunch.

It would be so easy to check this work of mine ...
First I calculated the force, then I calculated the centripetal acceleration.
I didn't use either answer to find the other one, and I didn't use  "  F = MA "
either.

I could just take the ' F ' that I found, and the 'A' that I found, and the
electron mass that I looked up, and mash the numbers together to see
whether  F = M A .

I'm going to leave that step for you.   Good luck !

Hardness is indirectly related to: specific gravity surface roughness strength of chemical bonds weight

Answers

The strength of chemical bonds would be the best answer to this question. Hardness is indirectly related to the strength of chemical bonds. Hardness is the resistance from the destruction of an object itself from a material. Hardness does not need to strength of chemical bonds in order to have this resistance.
Hardness is indirectly related to: strength of chemical bonds.

What is cell function

Answers

Answer:

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.

Explanation:

How much work is done on a a 60 n box of books that you carry horizontally across a 6 m room?

Answers

W = F x s cos thita.
= 60 x 6 x cos thita
since it is horizontal, thus the angle will be 90 degrees.
Thus, W = FS 90 degree.
Since the angle is 90 degree, cos thita will become zero.

thus, W = 60 x 6 x 0
=0
Thus, work done will be zero.
the work done on a a 60 n box of books that you carry horizontally across a 6 m room is 0

A positive charge is moving from the floor of a room toward the ceiling. A magnetic field runs from east to west. In what direction is the magnetic force on the moving positive charge?a. toward the north
b. toward the south
c. toward the east
d. toward the west
e. toward the floor

Answers

It will be in the same direction of the charge so it will be toward the north

What is one way that fission and fusion are similar?

Answers

Well, they both start chain reactions and they are also both used in certain nuclear bombs. Also they are both natural processes that occur in the sun, where hydrogen fuses with helium atoms and then they split by the process of fission.
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