Two forces P and Q acting at a point at an angle have their resultant
(2n + 1)√P2 + Q2 and when at an angle (90° - ),the resultant is(2n - 1)√P2 + Q2.
Show that tan = (n - 1)/( n + 1).

Answer:

No answer available

PLEASE MARK AS BRAINLIEST ANSWER

Answer:

Potassium and iodine

Explanation: I took the quick check

Explanation:

Answer:

42.5J/kgk

Just use the formula

C = Q/m x change in temp

Answer:

Nitrogen is N, neon is Ne

Answer:

Symbol of Nitrogen is N symbol of Neon Ne.

Answer:

Explanation:

formula

t = d/r

d = 404927 km or 404927000 meters

r = 3 * 10^8 m/s

t = 404927000 / 3 * 10^8

t =1.35 seconds.

That's one way. To get it to go all the way and back multiply by 2

t = 2 * 1.35

t = 2.70 seconds

Answer:

All of the above is the answer

hope it helps.

mark me as Brainliest plz!

Answer:

option d.

d) All of the above .

Answer:

only God knows what they are asking

Explanation:

Divergent is your answer.

have a good day.

Explanation:

the answer is in the image above

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

Answer:

Temperature is a measure of the average kinetic energy of the particles in an object.

Using the modern celcius system of temperature measurement, We. an easily determine how hot or cold it is. It was also know as Centigrade. This is because it is based on the freezing and boiling points of water with 100 degrees between those temperatures.

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]

Answer:

hope that helps uh..☺

Answer:

1298768.6

Explanation:

34.9 x 46 = 1605.4

1605.4 x 809 = 1298768.6

Answer:

14.1m/s

Hope it helps

Have a great day

a) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. This is because a positive and negative electric charge is produced, therefore the balloon sticks to the wall.

b) When an object is thrown up, it comes back to ground because of gravitational attraction force of earth.

c) Mountaineers suffer nose bleeding at higher altitudes because the oxygen level decreases with increase in altitude, which the body cannot adjust.

d) Foundations of high rise buildings are kept wide because more is the area of contact, less is the pressure efforts. So, foundations are wide so as to decrease the possibility of the building from falling down.

e) Deep sea divers or high altitude fliers wear special suits so as prevent their body from being crushed by the water pressure. Since water pressure is maximum at deep seas and oceans, therefore, more is the risk of being injured.

f) Walls of a dam are thickened near the base so that the dam can handle the kinetic energy pressure and prevent itself from breaking down, which if not, can lead to flooding.

HOPE IT HELPS...

Answer:

The term “INTERmolecular forces” is used to describe the forces of attraction. BETWEEN atoms, molecules, and ions when they are placed close to each other. •

Hope it helps

Mark me as Brainliest plz.

:DD

Answer: are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between atoms and other types of neighboring particles, e.g. atoms or ions.

Explanation:

Density of the metal is 8.9g/cm^3

Density:-

[tex]\boxed{\sf Density=\dfrac{Mass}{Volume}}[/tex]

SI unit:-

SI unit of density is kg/m^3

CGS unit of density is g/cm^3

[tex]\huge\bigstar{\underline{{\red{A}{\pink{n}{\color{blue}{s}{\color{gold}{w}{\color{aqua}{e}{\color{lime}{r}}}}}}}}}\huge\bigstar[/tex]

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:

Climate scientists compare the tree growth records to local weather records. For locations where a good statistical match exists between tree growth and temperature or precipitation during the period of overlap, the ring widths can be used to estimate past temperature or precipitation over the lifetime of the tree.

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:

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:

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.

Hi :)

The formula for velocity is

v = displacement / change in time

velocity = 100 m / 4 seconds

velocity = 25 m/s

The formula for velocity is

v = displacement / change in time

velocity = 100 m / 4 seconds

velocity = 25 m/s

Answer:

You would get an electric shock if the live wire inside an appliance, such as a cooker, came loose and touched the metal casing. ... A strong current surges through the earth wire because it has a very low resistance . This breaks the fuse and disconnects the appliance.

Explanation:

I'm not sure but I hope it helps!

Acceleration is the rate of change of velocity over time. The diagram that shows the effect of cutting acceleration by half without changing initial velocity is graph (c)

The equation is given as:

[tex]v = 2t + 4[/tex]

The first equation of motion is:

[tex]v = u + at[/tex]

By comparing both equations, we have:

[tex]u = 4[/tex] --- initial velocity

[tex]a = 2[/tex] --- acceleration

When the acceleration is cut in half, the new acceleration is:

[tex]a_{new} = \frac a2[/tex]

[tex]a_{new} = \frac 22[/tex]

[tex]a_{new} = 1[/tex]

So, the equation of velocity is:

[tex]v = u + at[/tex]

[tex]v = 4 + 1 \times t[/tex]

[tex]v = 4 + t[/tex]

When [tex]t = 0[/tex]

[tex]v = 4 + 0 = 4[/tex]

When [tex]t = 1[/tex]

[tex]v = 4 + 1 = 5[/tex]

The graph of velocity that satisfies [tex]v = 4 + t[/tex] and the values of time (t) and velocity (v) tested above is (c).

See attachment for the diagram (graph)

Read more about velocity and acceleration at:

https://brainly.com/question/2239252

Answer:

Most commonly anti-freeze is used in the motor engine, but water is sometimes used because it has a high thermal conductivity.

Explanation:

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:

1. Flexibility.

2. Muscular Fitness

3. Cardiovascular Fitness

4. Cardiovascular Fitness

5. Flexibility

6. Muscular Fitness

7. Cardiovascular Fitness

We know

[tex]\boxed{\sf n_{21}=\dfrac{C}{V}}[/tex]

How he find:-

The owner will measure speed of light through the index(Diamond or rutile).Then using calculations he fill find which is the velocity of diamond or rutile

[tex]\\ \sf\longmapsto n_D=\dfrac{C}{V_D}[/tex]

[tex]\\ \sf\longmapsto 2.4=\dfrac{3\times 10^8ms^{-1}}{V_D}[/tex]

[tex]\\ \sf\longmapsto V_D=\dfrac{3\times 10^8ms^{-1}}{2.4}[/tex]

[tex]\\ \sf\longmapsto V_D=1.25\times 10^8ms^{-1}[/tex]

[tex]\\ \sf\longmapsto V_D=125\times 10^6ms^{-1}[/tex]

[tex]\\ \sf\longmapsto n_R=\dfrac{C}{V_R}[/tex]

[tex]\\ \sf\longmapsto V_R=\dfrac{C}{n_R}[/tex]

[tex]\\ \sf\longmapsto V_R=\dfrac{3\times 10^8ms^{-1}}{2.9}[/tex]

[tex]\\ \sf\longmapsto V_R=1.03\times 10^8[/tex]

[tex]\\ \sf\longmapsto V_R=103\times 10^6ms^{-1}[/tex]

When an electromagnetic wave (like light) travels in a given medium, the speed of the wave in the medium depends on the refractive index of the material.

Such that if the refractive index is n₀, the speed of the wave in that material will be:

v = c/n₀

where c is the speed of light in vacuum.

c = 3×10^8 m/s

Now, we know that:

the refractive index of diamond is 2.4

the refractive index of rutile is 2.9

And the owner can measure (in some way) the speed of light through each material.

Looking at the equation of the speed of the wave in a material, we can see that as the index of refraction increases, the velocity should decrease.

Then when the light travels in the rutile (which has a larger index) it will have a smaller velocity than in diamond.

Where the speed in rutile is:

[tex]V_r = \frac{3\cdot 10^8 m/s}{2.9} = 103,448,275.1 m/s[/tex]

And in diamond is:

[tex]V_r = \frac{3\cdot 10^8 m/s}{2.4} = 125,000,000 m/s[/tex]

So measuring the speeds in each cristal, she can know which one is diamond and which one is rutile.

If you want to learn more, you can read:

https://brainly.com/question/2660868