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Electric shock: occurs when an extremity such as a finger, hand, or arm is placed across an electric current. The body is a good conductor of electricity because it is made up of mostly water. Electric shock can be mild, moderate, or severe. A mild electric shock leaves a slight tingling sensation. The moderate electric shock causes the muscles to contract and it may be difficult to pull away from the electric current. The severe electric shock causes respiratory or heart failure.Electrical burn: occurs when severe electric shock causes tissue to burn. Electrical burns can be external or internal. Internal burns occur when the electric current takes a path through bone and burns deep tissue.Electrical fires: occur when electric current ignites flammable materials. Electrical fires are extremely dangerous because putting them out with water may expose a person to a higher risk of electric shock.

Electrical accidents can occur due to a number of factors, including:Old wiringElectric cords that run under carpetingFlammable materials left near exposed electrical wiring in the workplaceLoose connectorsPoor wiring: substandard wiring can lead to electrical fires and electric shockLack of preventive devices such as ground fault circuit interrupters (a device that monitors and shuts off electric current in the event that the flow fluctuates), three-pronged outlets, and polarized plugs

(i) The fuse breaks the circuit if a fault in an appliance causes too much current flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

(ii) Earthing System or Grounding System in an electrical network work as a safety measure to protect human life as well as equipment, the main objective of the Earthing system is to provide an alternative path for dangerous currents to flow so that accidents due to electric shock and damage to the equipment can be avoided.

Force= m x aa= (16-10)/3a= 6/3= 2 m/s²Force= 250 x 2= 500N

According to lens maker's formula, where n= n2/n1

if n2=n1, 1/f = 0 or f =

this means that when n1=n2, the lens in liquid will act like a plane sheet of glass. Therefore when the refractive index(n1) of the liquid is equal to the refractive index(n2) of the lens material, the lens will disappear.

therefore, n1=n2=1.47

The liquid is not water because refractive inde of water is 1.33

M = 1+25/f

so, 10 = 1+25/f=> 25/f = 10-1 = 9=> f = 25/9 cm

According to lens maker's formula, where n= n2/n1

if n2=n1, 1/f = 0 or f =

this means that when n1=n2, the lens in liquid will act like a plane sheet of glass. Therefore when the refractive index(n1) of the liquid is equal to the refractive index(n2) of the lens material, the lens will disappear.

therefore, n1=n2=1.47

The liquid is not water because refractive inde of water is 1.33

-v/u is the magnification formula for a mirror.Since, it is found to be +1/5, hence the image is magnified.

UniformCircularMotion.Uniform motioncan be defined as themotionof a body following a circular path at a constant speed. ... At every point of itsmotion, theballchanges its direction. Therefore, we can say that in order to stay on a circular path, theball hasto change its direction continuously.

thank you

The resultant of lower 6N and 6N , will be √6²+6² = 6√2N = √72N , and the direction will be along OB

now the resultant of √72N and 6√2N(=√72N) , will be along OE... as both the vectors are of same magnitude..

so, the resultant will be √(√72)²+(√72)² = √144 = 12N

so option D.

:m=0.1kgvi=20m/svf=0m/st=0.1sI=?Fav=?solution:Fav=ma=m(deltav/delta t)=0.1(20/0.1)* F=20Nnowimpulse =F×t=20×0.1=2Ns

the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.

The correct answer is option no. (1) 120m/s

Afreely suspended magnetwill also point towards south. The south pole of amagnet barpoints towards north because themagneticfield around the earth happens to have its north pole towards north.

A FREELY SUSPENDED MAGNET POINTS IN THE NORTH SOUTH DIRECTION AS THE NORTH POLE OF THE EARTH ATTRACTS THE SOUTH POLE OF THE MAGNET. ON THE OTHER HAND SOUTH POLE OF THE EARTH ATTRACTS THE NORTH POLE OF THE MAGNET.SO A FREELY SUSPENDED MAGNET ALWAYS POINTS IN THE NORTH SOUTH DIRECTION.

When a flat current carrying coil is placed in uniform magnetic field such that dipole moment of coil is antiparallel to manetic field, then coil is in state of unstable equilibrium.

If we disturb the coil so that direction of dipole moment of coil is even slightly changed, the coil will flip by 180 degree.

You can also use expression for potential energy to prove the same mathematically.

U = - pB cos(pB)

for (pB) = 180, cos(pB) = -1

thus U = pB

i.e. Maximum energy state, thus unstable equilibrium.

Newton's second law states that acceleration of a body depends on its mass and the net external force acting on the force.

its answer is 30 or -30 ??

time period= 1 / frequencyso it would be 1/20 0.05 hz

2R due to wires resistance is 0

Electron moves in a magnetic field in the direction of the motion

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Electron moves in a magnetic field is the direction of the motion.

In the first case-Force applied=400NDimensions=20cm x 10cm =0.2m x 0.1mArea=0.2x0.1m²=0.02m²Pressure applied=(400N)/(0.02m²) =20000Pa

In the second case-Force applied=400NDimensions=10cm x 15cm =0.1m x 0.15mArea=0.1x0.15m²=0.015m²Pressure applied=(400N)/(0.015m²)=26666Pa

Ratio= 20000Pa:26666Pa = 10000:13333

M = 500g = 0.5 kg

v = 0 m/s

u = 50 m/s

t = 0.01 s

F = m(v-u) / tF = 0.5 (50-0) / 0.01F = 0.5 x 50 x 100 / 1F = 2500 N

Force of nail = 2500 N

3 I)Impulse I = change in momentum

I= mv’-mv

we will take vertival and horizontal component

angle theta = 45’

I= (mvcos45°-mvsin45°)-(mvcos45°-mvsin45°)

vertical resolution cancelout & horizontal adds up

I=2mvsin45

I=2*0.05*20*1\root2

= 1\root2

= √2/2 N-s

Mass of object = 50g

Volume of object = 100 cm^3

Therefore, Density of object = Mass/Volume = 50/100 = 0.5g/cm3

Density of water = 1 g/cm^3

Since the density of the object is less than the density of water, the buoyant force acting on the object will be more than its weight acting downwards.

Hence,the object will float in water.

it's asked about the weight of the object when immersed in water...

35.AGrowth hormone is secreted by pituitary glands36.AGreogor Mendel proposed the principle of heredity

Theoceanlooksbluebecause red, orange and yellow (long wavelength light) are absorbed more strongly by water than isblue(short wavelength light). So when white light from the sun enters theocean, it is mostly thebluethat gets returned. Samereasonthe sky isblue

The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned. Same reason the sky is blue.

(4)

Characteristics of SoundThere are three characteristics of sound. 1.Loudness2.Pitch3.Quality/timbre

LoudnessIt is the characteristic of the sound by which a loud sound can be distinguished from a soft sound. Loudness depends on the intensity of sound near the ear. It is the measure of ear's response to the vibration.

PitchPitch of a sound depends upon the frequency of the sound recorded by the human. If the frequency of a vibrating object is low then the pitch of sound is said to be low and vice versa

Quality/Tibre It is that characteristic if sound which enables us to distinguish between the sounds if same loudness and pitch. Quality of a sound depends on wave form of the sound.

Pegasus

Slope of V-t graph gives acceleration

so ratio of acceleration = ratio of slopes = tan(30)/tan(60) = (1/√3)/√3 = 1/3

graph

option 2 when we write -30,-40 in vectorial form-(30i+40j)

for reference.

Pegasus. This is the first and only satellite

Is it 2.5 kg?