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I guess their is some mistake in this question..btw what is the answer mentioned in book?

assuming , +x axis as => i and +y axis as => j

so, |V|ab = 30√2 = 30i +30j = |V|a -|V|band |V|b = -20j

so , from both , |V|a = |V|ab +|V|b = 30i+(30-20)j = 30i+10j

now |V|ca = |V|c - |V|a = 10√2 = -10i+10j |V|c = |V|ca +|V|a = -10i+10j+30i+10j = 20i+20j

so the value of |Vc| = √20²+20² = 20√2..

and the direction is in +i,+j that is north-east. (45° with the east.)

option A

Ohh!! so we have to apply vector form.

Got it.

Thanks sopan!

oh..thank you so much..😊

(C) Mechanical losses

Explanation:A transformer is a static device, hence mechanical losses (like friction loss) are absent in it. A transformer only consists of electrical losses (iron losses and copper losses). Core Loss Or Iron Loss: Core losses are due to the magnetic properties of the material used for the construction of the core.

Thanks

As 100cm = 1 meter1 cm = 1/100 meterthen 50cm = 50/100 = 1/2 meterTime = 5 secondthen speed = 0.5/50.1m /second

5.5m/s & 33333.3cm/s

thank you very much

2.01* 10"20 N

2.01

Multiplymasstimes acceleration. The force (F) required to move an object ofmass(m) with an acceleration (a) is given by theformula F= m x a.400×10 = 4000 newton

PV=nRTin isobaric processn*T=constant1*(273+60)=(1/3)*TT=999K

Torque or turning effect due to a force is maximum when r is maximum.We prefer to use a wrenchwithlong armbecause when the length of thearm(r) islong, the force (F) required to produce a given turning effect ( x ) is smaller. Hence, a nut can be unscrewed easily.

Non-conventional source of energyHydro power plant is a conventional source of energy and Solar Energy is a non conventional source of energy.

option (c) is right answer

Using v = u + atv = final velocityu = initial velocitya = accelerationt = time taken

For ostrichv = 144 km/hr = 144*5/18 = 40 m/su = 0t = 2 s

40 = 0 + a1*2a1 = 40/2 = 20

For Leopardv = 108 km/hr = 144*5/18 = 30 m/su = 0t = 3 s

30 = 0 + a2*3a2 = 30/3 = 10

Ratio of acceleration of Ostrich and Leopard a1:a2 = 20:10 = 2:1

(a) is correct option

Right answer is c. 4:1.

Wavelength is inversely proportional to the deviation in the path of the light. Red light suffers the least amount of deviation and violet the most. When a white light is made to pass through a prism, formation of a spectrum of seven colors occurs showing white light is a combination of seven separate colors.

is it's correct option(a)

Thanks for liking

(a) red is correct option

thanku jii

1

2

Suppose an object of mass, m is moving along a straight line with an initial velocity, u.It is uniformly accelerated to velocity, v in time, t by the application of a constant force, Fthroughout the time, t. The initial and final momentum of the object will be,p1 = mu and p2 = mv respectively. The change in momentum ∝ p2 – p1The change in momentum∝ mv – muThe change in momentum∝ m × (v – u).The rate of change of momentum ∝ m × (v −u)/tOr, the applied force,F ∝m × (v −u)/tF = km (v - u)/t

F = kma Here a [a = (v – u)/t ] is the acceleration, which is the rate of change of velocity. The quantity, k is a constant of proportionality.The SI units of mass and acceleration are kg and m s-2 respectively. The unit of force is so chosen that the value of the constant, k becomes one. For this, one unit of force isdefined as the amount that produces an acceleration of 1 m s-2 in an object of 1 kg mass.That is, 1 unit of force = k × (1 kg) × (1 m s-2).Thus, the value of k becomes 1. and F = ma which is the mathematical expression on the Newton's second law of motion.

Power = Work done in unit timePower = Work/TimeMike's power = 5/10 = 0.5 J s-1Joe's power = 3/5 = 0.6 J s-1. Hence, Joe produced more power.

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second law of motion is interia

Newton's first law of motionpredicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law ofinertia- states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Objects atequilibrium(the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is anetorunbalanced forceacting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction

Newton's first law of motionpredicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law ofinertia- states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Objects atequilibrium(the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is anetorunbalanced forceacting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction

S = Ut +1/2 at^2 is the second law of motion.

law of interia is the second law of motion

according to second law of motion force=mass×acceleration i.e f=m×a

Newton's second law of motion pertains to the behavior of objects for which all existing forces arenotbalanced. The second law states that the acceleration of an object is dependent upon two variables - thenet forceacting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

second law of motion is interia

Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force. However, if the object is already in motion, or if this situation is viewed from a moving inertial reference frame, that body might appear to speed up, slow down, or change direction depending on the direction of the force and the directions that the object and reference frame are moving relative to each other.

From Newton's second law, F= ma

If F=0, then a=0

This means that if no force is applied on the body, it's acceleration will be zero. If the body is at rest, it will remain at rest and if it is moving, it will remain moving in the same direction with the same speed. Thus a body not acted upon by any external force, does not change its state of rest or of motion.

This statement is Newton's First Law of Motion.

As sini/sinr = u

More the r more the sinr therefore lesser will be refractive index

As refractive index is inversely proportional to speed in medium

therefore lesser the refractive index more thr speed

Therefore 40 degree will have maximum speed

what is the source of question

Forcesthat do not store energy are callednonconservativeor dissipativeforces. Friction is anonconservative force, and there are others. Any friction-typeforce, like air resistance, is anonconservative force. The energy that it removes from the system is no longer available to the system for kinetic energy.

A conservative force is a force with the property that the total work done in moving a particle between two points is independent of the taken path. Equivalently, if a particle travels in a closed loop, the net work done by a conservative force is zero

Lubricants are usedto reduce the friction between the parts of the machineswhich are connected together.Oilis the example of the lubricant.Lubricantsmakes themachinesefficient.

radian = 60° x π/180 = π/3

hence, option (b) is correct

When 1 Joule of work is done to move a charge of amount 1 Coulomb from one place to another, then it is said that the potential difference between the two points is 1 Volt (V).

It will behave as a coil

The RawFacts and Figures are CalledData. The word raw means that thefactshave not yet beenprocessedto get their exact meaning.hence processed facts and figures are information.

The concave surface reflects the produced sound waves towards the audience, thereby preventing sound from spreading in various directions. Consequently,the audience gets a parallel beam of powerful sound.

∆m=(43+0.5)kg is the right answer

2NaCl

Na2CO3 + 2HCl ===> 2NaCl + H2O + CO2(g)

Thus x=2NaCl

Na2Co3 +2HCl=2Nacl+co2+H2o

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.Lubrication present within any surface is on of the causes that affect the phenomenon of friction.

Also, the texture of the surface on which friction is taking place also affects friction.

Instance for such an occurrence, adding oil on a surface as a method of lubrication will affect the degree of friction to a great extent, turning it much smoother.

friction, resistance offered to the movement of one body past another body with which it is in contact. In certain situations friction is desired. Without friction the wheels of a locomotive could not grip the rails nor could power be transmitted by belts. On the other hand, in the moving parts of machines a minimum of friction is desired; an excess of friction produces heat, which in turn causes expansion, the locking of the moving parts, and a consequent breakdown of the machinery. Lubrication is important in minimizing friction as are also such devices as ball and roller bearings .

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. However, friction decreases with smoothness only to a degree; friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms. Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies. It does, however, depend on the magnitude of the forces holding the bodies together. When a body is moving over a horizontal surface, it presses down against the surface with a force equal to its weight, i.e., to the pull of gravity upon it; an increase in the weight of the body causes an increase in the amount of resistance offered to the relative motion of the surfaces in contact.