help me i dont understand

Answer:

1.41s,14.14m/s(approx.)

Answer:

1–

Explanation:

The fluorine is the element with biggest electronegativity in the periodic table, so it usually always take an electron and gets charge 1–

The valence electrons that Fluorine possesses is 7. Then, the charge of its ion would most probably be:

C). 1–

Fluorine is the element having F as its symbol and 9 as its atomic number(9 protons).

Learn more about 'chemical elements' here:

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Answer:

hope that helps uh..☺

Answer:

1298768.6

Explanation:

34.9 x 46 = 1605.4

1605.4 x 809 = 1298768.6

ADVANTAGE

PEOPLE USED CERTAIN UNIT OF MEASUREMENT IN THEIR SPECIFIC REGION WHICH IS NOT ACCEPTED BY WORLD IN CGS SYSTEM.CGS UNIT MADE

DIFFICULTY IN TRADE. LATER SI UNIT OF MEASUREMENT HAVE BEEN ADOPTED IN 1960 AD TO BRING THE uniformity IN measurement throughout THE WORLD. SI SYSTEM MADE THE MEASURENT AROUND WORLD MORE EFFECTIVE AND LESS COFUSING THAN CGS UNIT.

Answer:

No answer available

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Answer:

42.5J/kgk

Just use the formula

C = Q/m x change in temp

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Archimedes’ principle is the physical law of buoyancy, discovered by the ancient Greek mathematician and inventor Archimedes, stating that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force, the magnitude of which is equal to the weight of the fluid displaced by the body. The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid or to that fraction of the volume below the surface for an object partially submerged in a liquid. The weight of the displaced portion of the fluid is equivalent to the magnitude of the buoyant force. The buoyant force on a body floating in a liquid or gas is also equivalent in magnitude to the weight of the floating object and is opposite in direction; the object neither rises nor sinks. For example, a ship that is launched sinks into the ocean until the weight of the water it displaces is just equal to its own weight. As the ship is loaded, it sinks deeper, displacing more water, and so the magnitude of the buoyant force continuously matches the weight of the ship and its cargo.

Answer:

Archimedes principle states that"When a body is fully or partially immersed in a liquid,it experience an upthrust which is equal to the weight of the liquid displaced"

Answer:

its c

Explanation:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

the real answer is

O metals and nonmetals, electrons transferrednonmetals and metals, electrons shared

Answer:

All of the above is the answer

hope it helps.

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Answer:

option d.

d) All of the above .

Answer:

Potassium and iodine

Explanation: I took the quick check

Answer:

Nitrogen is N, neon is Ne

Answer:

Symbol of Nitrogen is N symbol of Neon Ne.

Explanation:

Frictional force is produced when two different objects are in very close contact and are slided against each other.

It also depends on the roughness of the object i.e, the rougher will be the object the higher friction will be produced and vice-versa.

Answer:

Hey mate....

Explanation:

This is ur answer....

Hope it helps!

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The greatest acceleration on the graph is   4 m/s²  .

"Acceleration" means how fast velocity is changing.

Changing velocity means changing speed OR direction.

This graph doesn't tell us anything about the direction of motion, so we can only work with speed.

The "greatest" acceleration means the biggest change of speed in the shortest time.

Your picture of the graph is pretty fuzzy, and I'm not sure I can actually read everything correctly.  

The y-axis looks like it's velocity, and I THINK the numbers are  0, 20, 40, and 60, in meters per second.

The x-axis looks like time, and I THINK it's marked 0, 10, 20, 30, 40, 50, 60, 70, and 80, in seconds.

Now, each straight piece on the graph shows a change of velocity and a change of time.  So the SLOPE of each piece is the acceleration of that piece.

==> On the first piece, from 0 to A, the velocity changes from 0 to 20 m/s, and the time changes from 0 to 20 sec.  The slope of that piece is (20 m/s) / (20 sec), so the acceleration is  1 m/s² .

==> On the level piece from A to B, the velocity is 20 m/s.  It doesn't change, from 20 to 30 sec. It has no slope, so the acceleration is zero.

==> On the piece from B to C, the velocity rises (60 - 20) = 40 m/s, and the time changes (40 - 30) = 10 sec.  The slope is (40 m/s) / (10 sec), so the cceleration on that piece is  4 m/s² .    

==>  Finally, on the last piece, from C to D, the velocity DROPS from 60 to 0 m/s, during the time from 40 to 80 sec.  The change in velocity is -60 m/s, and the change in time is 40 sec. So the slope of the piece, and the acceleration, is  (-60 m/s) / (40 sec)  =  -1.5 m/s² .

The greatest acceleration shown on the graph happens along the line segment from B to C, from 30 to 40 seconds. During that time, the velocity changes from 20 to 60 m/s.  That's an acceleration of   4 m/s² .    

Answer:

1m

Explanation:

The conversion is 1mm = 0.001m. So all we need to do to find how many mm there are in a meter, all we need to do is divide by a 1000;

1000 / 1000 = 1m

Best of Luck!

Answer:

the thumb

Explanation:

pressure is exerted more by an area of small surface area.

pressure is got by P=Force/Area in contact

on the thumb there is a smaller area in contact. so as the area reduces, the force exertes becomes greater.

Answer:

Explanation:

Thks for answer

The spirit rover could move across the Martian landscape at a maximum of 2.68 m/mi. It would take 3.88 minutes  to travel 10.4 m, the length of a typical classroom

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is meter/second. The generally considered unit for speed is a meter per second.

In this scenario, a body would move at a speed of 4 meters per second while covering a distance of 2000 meters in 50 seconds.

As given in the problem The spirit rover could move across the Martian landscape at a maximum of 2.68 m/mi.

The speed of the spirit rover = 2.68 m/mi

as we know

speed = distance /time

2.68 m/mi = 10.4 meters/ time in minutes

time in minutes = 10.4/2.68 minutes

                          = 3.88 minutes

Thus. it would take 3.88 minutes for the spirit rover to travel 10.4 m, the length of a typical classroom

Learn more about speed from here

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Answer:

The combination of cells in which the negative terminal of a first cell is connected with the positive terminal of second cell and the negative terminal of a second cell is connected to the positive terminal of a third cell and so on is known as series combination of cells.

Explanation:

hope this helps to u

Answer:

Battery.

Explanation:

'What is the magnitude of the force needed to stop the horses and bring the box into equilibrium?' ≈42N; according to the vectors rules.

'Where would you locate the rope to apply the force?' - in point D.

PS. zoom out the attached picture.

Explanation:

the answer is in the image above

Explanation:

a).  The gravitational forces between the Earth and the Sun bends the Earth's motion along a curving path instead of a straight line.

b).  The gravitational forces between the Earth and a falling rock make the rock fall faster and faster.

c).  The force of a pressurized stream of hot air makes a balloon get rounder and bigger.

d).  The gravitational forces between the Earth and a rock tossed straight up make the rock go slower and slower, and eventually stop.  (In the next instant,  it starts falling, as described in answer-b.))

e).  The acoustic and emotional force of your mother's voice 15 minutes before the school-bus arrives causes you to turn over, sit up, and start putting on your socks.

Answer:

It is 4,250 N

Explanation:

Mass of each boot:

[tex] = \frac{1}{2} \times 850 \\ \\ = 425 \: g[/tex]

Weight:

[tex]{ \sf{weight = mass \times acceleration}} \\ { \sf{weight = 425 \times 10}} \\ { \sf{weight = 4250 \: newtons}}[/tex]

Please find the attached photograph for your answer. Please do comment whether it helped you or not.

Answer:

Option (I)

Explanation:

The independent varible is arm length. Therefore, to eliminate the effect of other factors and make a valid and effective conclusion, only the arm length should be changed, while other factors (mass, force and materials) should remains the same.

Answer: Only the arm length should be changed. The mass should remain the same.

Explanation:

Answer:

sum of protons and neutrons in the nucleus of an atom

Explanation:

Mass number=proton number + neutron number

Answer:

Mass number= protons(atomic number) + neutrons

It is the total number of nucleons present in an element

Answer:

kinetic

Explanation:

kinetic energy is powered by motion or gravity the steeper the hill is the faster a ball will roll