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A physical QUANTITY having both magnitude and direction need not be considered a vector. For example, DESPITE having magnitude and direction, current is a SCALAR quantity. ... Generally speaking, the rotation of a body about an axis is not a vector quantity as it does not follow the law of vector addition

45° EXPLANATION:

Graphite is a CRYSTALLINE form of carbon.It has sp² hybridization.It has flat hexagonal sheets of C atoms attatched to other sheets.==================================================It is a good lubricant and is black and OPAQUE and hence is USED in pencil leads.PLEASE MARK AS BRAINLIEST IF HELPFUL!!!

Explanation:Variable resistance (Rheostat) :-It is a device which is used to change the resistance in the circuit due which the current flowing through the circuit will change.Different components of an electric circuit, ammeter, voltmeter LIKE bulb, torch bulb, nichrome wire have different resistance, therefore flow of current will be different in the different components.Motion of electrons in the electric circuit constitutes an electric current. The electrons are not completely free to MOVE within the CONDUCTOR. They are HELD by the attractive forces of the atoms in which they move.Motion of electrons is retarted  by resistance.A good conductor offers a low resistance.A component of electricity that offers a high resistance is a poor conductor.An insulator offers a maximum resistance and does not allow current to flow.

1.weight of the OBJECT ACTING downwards2.buoyant FORCE acting UPWARDS

na = 1.5 NU = 1 vu = 3x10⁸ m / s Asked: Va? ANSWERED: Va / Vu = nu / na Va / 3x10⁸ = 1 / 1.5 Va = 1 / 1.5 x 3x10⁸ Va = 2x10⁸ m / s

Each row CONSISTS of n cells joined in series. The total number of cells is EQUAL to N. This battery SENDS a maximum current LIN a given external circuit. Now, the cells are so ARRANGED in the battery that instead of m rows rows are joined in parallel and each row consists of m cells joined in series.

an electromagnet is a MAGNET which RUNS on electricityExplanation:an electromagnet is a soft METAL core MADE into a magnet by the passage of electric current through a coil sorrounding it

Mass ➡️▪︎The mass of a BODY is the quantity of matter contained in it. ▪︎Mass is a scalar quantity which has only magnitude but no direction.▪︎Mass of a body ALWAYS remains constant and does not change from place to place.▪︎SI unit of mass is kilogram (kg).▪︎Mass of a body can never be ZERO.Weight ➡️ ▪︎The force with which an object is attracted towards the centre of the earth, is called the weight of the object.Now, Force = m × aBut in case of earth, a = g∴ F = m × gBut the force of attraction of earth on an object is called its weight (W).∴ W = mg▪︎As weight always ACTS vertically downwards, therefore, weight has both magnitude and direction and thus it is a vector quantity.•The weight of a body changes from place to place, DEPENDING on mass of object.•The SI unit of weight is Newton.•Weight of the object becomes zero if g is zero._____❣

:DISPLACEMENT = x = 20t + 10t².Differentiating x :⇒ V = dx/dt⇒ 20 + 2*10t⇒ 20 + 20tNow, Instantaneous velocity at time 2 seconds :⇒ 20 + 20*2⇒ 20 + 40⇒ 60 m/sHence, Instantaneous velocity at time = 2 seconds is 60 m/s.Some Additional Information -DISTANCE is the LENGTH of total path travelled by a body.Displacement is the shortest distance between the initial position and the final position of the body.The magnitude of displacement is EQUAL to or less than the magnitude of distance.Speed is distance travelled per unit time.Velocity is displacement per unit time.

Explanation:Salt ions attract the water molecules much more STRONGLY than alcohol molecules do because alcohol is less POLAR than water. This means that when there is a lot of salt, all the water molecules will bond to the salt ions, leaving NONE to FORM hydrogen bonds with the alcohol molecules.

When the body is moving DOWNWARD its velocity INCREASES it is because the body is moving in the same direction as the force of gravity acts. ... During projectile MOTION the vertical components of velocity change, but not horizontal keeps normal CIRCUMSTANCES.

e...here is your answer...Here in this case the solution is as follows :t / 30 = 2\pi ROOT l / 9 and t / 36 = 2\pi root l - 22 / 9therefore, t / 30 X 36 / t = 2\pi  root 1 / 9 x 1 / 2\pi root 9 / l - 22so, l = 72 cm.so second length 72 - 22 = 50 cm.hope it helps...

dExplanation:1/2(a+b+c)HALF of FULL AREA

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Area of the parallelogram is .EXPLANATION:In the question,We have two vectors GIVEN to US,So,We also know that,Area of parallelogram, A is given by,So,Now,Area will be,THEREFORE, the area of the parallelogram is .

2tx=3-3tdx/dt=-3v=-3m/s constanta=0please CLEAR if is 2T or t

Fluids are made of a large number of very small particles, much too small to see. These particles are in constant, rapid motion. They bump into one another. They bump into the walls of any container that holds them. They bump into objects in the fluid. As the particles of a fluid bump into an object in the fluid, they apply forces to the object. The forces, acting over the object’s surface, exert pressure on the object. When the pressure in a fluid increases, the vparticles bump together more frequently. This increases the pressure on objects in the fluid. The pressure a fluid exerts on an object in the fluid is applied in all directions. That is because the particles that make up the fluid can move in any direction. These particles exert forces as they bump into objects in the fluid. The PICTURE shows how water exerts pressure on a diver who is underwater. Notice that the arrows point in DIFFERENT directions. That is because the water is pressing all around the diver, not just from above.TO PROVE THIS, Take an empty plastic BOTTLE or a cylindrical container. You can take a used plastic bottle. Drill four holes all around near the BOTTOM of the bottle. Make sure that the holes are at the same height from the bottom. Now fill the bottle with water.� You will observe that liquid coming out of the holes FALL at the same distance.Explanation:PLEASE MARK MY ANSWER AS A BRAINLIEST ANSWER... PLEASEFOLLOW ME

Explanation:The volume of the rolled cylindrical carpet = πr²l=> density = m/πr²lwhen the carpet unrolls to a RADIUS of r/2volume = πr²l/4Hence its massm₁ = density X volume = m/πr²l  x  πr²l/4=> m₁ = m/4Potential ENERGY of the rolled carpet = mgrpotential energy of the half unrolled carpet = m₁g(r/2)= m/4  x g  x r/2 =  MGR/8Hence loss in potential energy = mgr - mgr/8= 7mgr/8Hence the decrease in potential energy will be 7mgr/8

Explanation:displacement of VECTOR = 2×r =2×5 =10m distance covered =half of CIRCUMFERENCE of circle =1/2 of 2pir pi x RADIUS =pi×5 =5PI m

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Explanation:Given -MSR = 0.5 cmVSR = 25 LC = 0.001 cmZero ERROR = -0.0004 cm# Solution -Diameter of steel BALL measured by STUDENT -Measured diameter = MSR + VSR × LCMeasured diameter = 0.5 + 25 × 0.001Measured diameter = 0.525 cmTrue diameter of steel ball must be -TRUE diameter = Measured diamter - Zero errorTrue diameter = 0.525 - (-0.004)True diameter = 0.529 cmHope this HELPS you...

as DIAMETER can VARY upto 0.02mm in calculationwhere 0.02 mm is LEAST count of that instrument

I don't KNOW the ANSWER

Explanation:Horizontal distance COVERED by ball =nb Vertical distance covered by ball =NH If the time taken to hit the edge of nth STEP is t, then nb=ut nh=12gt2 Eliminating t, we get, nh=12g(nbu)2 n=2hu2gb2 Hence B is the correct ANSWER.

Explanation:A body is DROPPED from certain HEIGHT and it takes 4 seconds to reach ground, what is the displacement TRAVELED by OBJECT in the 3rd second of... A body falls freely from a height h. After travelling a distance h/u, the acceleration due to gravity disappears.

I don't KNOW the ANSWER

The SI unit for specific heat capacity is the joule PER kilogram Kelvin, J?kg-1?K-1 or J/(kg?K), which is the amount of energy required to raise the temperature of one kilogram of the substance by one Kelvin.Hope it will help you Please MARK as brainliest

end here is your answer.The conversion energy from electrical to mechanical was explained by Michael faraday ,a british scientist in the year 1821.T he energy conservative can be done by ARRANGING a current CARRYING conductor within a magnetic field.s o the conductor star ROTATING because of the generated torque from the magnetic field and electrical current. A british scientist William sturgeon was DESIGNED a DCmachine in year 1832 BASED on his law.h however it was, expensive and doesn't suitable for any application.So finally the electric motor was invented in the year 1886 by frank Jilian Sprague.I am not sure about my answer but if you get a little helps also from my answer so plz mark my answer as brainlist.

The SPEED of RAIN MUST be 2 km/hr

2.-150 JExplanation:Given:m=4 kgu=10 m/sv=5 m/sSolution:VARIOUS forces ACTING on the body are:Normal reaction in vertically upward directionweight of the body in vertically downward directionForce of friction in the opposite DIRECTION of motionThe change in velocity is only due to  frictional force cause WEIGHT and normal reaction are balanced and contribute nothing in changing the velocity as they are acting in a different plane.mg=N   (in vertical direction)From work energy theorem we know thatWork done by all the forces=change in kinetic energyW=ΔKE=KEf - KEiKEf=1/mv²=1/2*4*5²=50 JKEi=1/2mu²=1/2*4*10²=200 JthereforeW=50-200=-150 JHence frictional force does -150 J of work.PS: the NEGATIVE sign indicates that force and displacement are in opposite direction.Hope this helps

We KNOW that MAGNITUDE of RESULTANT

3Explanation:ACCELERATION can be EXPRESSED as a= V. (dv/dx)

direct formula BASED question of GRAVITATION. the ANSWER is EXPLAINED in the attachment

on between TWO bodies is defined as mutual interaction of the bodies for a short interval of time as a result of which the energy and momentum of the INTERCHANGING bodies are exchanged .ELASTIC COLLISION : the collision in which both momentum and kinetic energy of system are conserved .1. momentum is conserved .2. kinetic energy is conserved 3.the total energy hence is conserved .4. but mechanical energy cannot be changed into any other form of energy .5. forces involove during the interaction are of conservative nature.EXPLANATIONS ARE TOO LONG SO GIVING U PICTURE HOPE U WILL UNDERSTAND PLEASE MARK ME BRAINLIEST !!!!DEAR MATE

Height of the tower = 15u²/2gStep by step explanations :Given,a stone THROWN upward with a speed u from the top of the tower REACHES the ground with a VELOCITY 4uHere, Initial velocity of the stone = UAND we know that velocity at which is thrown upwards it passes it initial position at the same speed so, speed of stone in during passing it's initial position = uso, now we have, Initial velocity = ufinal velocity = 4uv² = u² + 2gh(4u)² = u² + 2gh2gh = 16u² - u²2gh = 15u² h = 15u²/2gso, Height of the tower = 15u²/2g

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