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Option- 2 volt

m=2000 kg

s=12 m

t=60 sec

p= w/t

p= ma/t (w=ma)

p=mgh/t (a=gh)

p=2000*9.8*12/60

p=3920 watt.

horse power = 3920/746

= 5.3 hp

The value of the gravitationalaccelerationon the surface of a planet of radius R andmassM is g=GM/R^2 . So the gravity on the moon is 1/6th that of Earth because the moon is far less massive than the Earth and has a different radius(R) as well.

avg velocity is given by (change in position)/(time) => (4-1)i+2-(-2)j +(3-3)k/2 => 3i+4j/2 the magnitude of 3i+4j = 5

so avg. velocity is 5/2 m/s.

although the distance can't be a complex number... kindly ensure that the question is correct

option D

true

The displacement will be the Shorted straight line distance from initial point to final point.

so, Displacement = 2r

As angle of incidence is 40° hence reflected angle will be 40°hence angle between incident ray and reflected ray will be 40+40=80°

sahi he kyaa

middle of the high jump means the highest point.

mass of person remains same everywhere

Since, weight of the person on planet A is half that on the earth, acceleration due to gravity there, will be 1/2 that on the earth. Hence he can jump double the height with the same muscular force.

Since weight is half, so he is lighter and will jump double the normal height, that is 0.8 m.

An athlete runs before jumping to gain momentum. Because it helps in jumping higher and longer because of inertia of motion gained due to the motion. When the athletes Jump they already have a forward motion that would be greater than that of a jump made from standing in one spot.

to gain mainraince of the body

Answer:d) in all directions

Explanation:

The pressure at a depth h in water is calculated using

P = ρ g h

So, this pressure has a high magnitude at a large depth.

But, also note that the pressure is same in all directions at a given depth. So, the submarine will experience a pressure on all of it's walls whether they are below or above. Imagine holding a banana in your hand and crushing it b closing your fist. The same would happen to the submarine. Hence, the answer is (d) in all directions.

Any process taking place sufficiently slowly, not involving accelerated motions and large temperature gradients can be treated as quasi-static process.

isothermal process

isobaric process

Force=massxaccelerationhence for doubling mass the acceleration must be halved as it is indirectly proportional.

the rains ,we went out

Acoupleis two equal forces which act in opposite directs on an object but not through the same point so they produce a turning effect. Themoment(or torque) of acoupleis calculated by multiplying the size of one of the force (F) by the perpendicular distance between the two forces (s).

A couple is two equal forces which act in opposite directs on an object but not through the same point so they produce a turning effect.

We see thelightningbefore wehear thethunderbecause light travels faster than sound. The lightfromthe lightningtravels to our eyes much quicker than the soundfromthelightning. so wehearitlaterthan we see it.

In physics, acceleration is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. The SI unit for acceleration is metre per second squared (m s−2).

A typical cloud-to-ground lightning bolt begins when a step-like series of negative charges, called a stepped leader, races downward from the bottom of a storm cloud toward the Earth along a channel at about 200,000 mph (300,000 kph). Each of these segments is about 150 feet (46 meters) long.When the lowermost step comes within 150 feet (46 meters) of a positively charged object, it is met by a climbing surge of positive electricity, called a streamer, which can rise up through a building, a tree, or even a person.

When the two connect, an electrical current flows as negative charges fly down the channel towards earth and a visible flash of lightning streaks upward at some 200,000,000 mph (300,000,000 kph), transferring electricity as lightning in the process.

The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration.

a) Hypermetropia(long-sightedness) is a common eye condition where nearby objects appear blurred, but your vision is clearer when looking at things further away. If you feel your eyes are often tired and you have problems focusing on objects close to your eyes, you may havehypermetropia.

b) Youreyesfocus light rays and send the image of what you’re looking at to yourbrain. When you’re farsighted, the light rays don’t focus like they should. Thecornea, the clear outer layer of youreye, and the lens focus images directly on the surface of your retina, which lines the back of theeye. If youreyeis too short, or the power to focus is too weak, the image will go to the wrong place, behind the retina. That’s what makes things look blurry.

Hyperopia often runs in families. But lots of children who get it from their parents outgrow it.

c) Farsightedness can be corrected with glasses or contact lenses to change the way light rays bend into the eyes.

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Ans :- A revolving structure in an electric motor or generator, wound with the coils that carry the current. any part of an electric machine or device that moves under the influence of a magnetic field or within which an electromotive force is induced.

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Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them

Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them

Inertia is the resistance of any physical objects tp any change in its velocity. This includes changes to the object's speed, I or direction of motion. An aspect of this property is the tendency of objects to keep moving in a stright line at a constant speed, When no focus act upon them.

Everybody has inability that it can not change its state i.e. Rest or motion on its own this PROPERTY of everybody is defined as inertia it is measured in terms of mass

Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

Inertiais a property of matter that causes it to resist changes in velocity (speed and/or direction). According to Newton's first law of motion, an object with a given velocity maintains that velocity unless acted on by an external force. ... The mass of an objectcanbe measured by observing the extent of itsinertia.

Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.

Hypermetropia, sometimes called hyperopia, is the term used to define being longsighted.If you are hypermetropic, the image of a nearby object is formed behind the retina. This means that light is focused too far back in the eye, causing things which are close up to appear blurred.Longsightedness is corrected using a convex (outward facing) lens. This is placed in front of a hypermetropic eye, moving the image forward and focusing it correctly on the retina.

The Delta configuration has the three phases connected like a triangle, whereas the Wye (or “star”) configuration has all three loads connected at a single neutral point. Delta systems havefour wires—three hot and one ground. Wye systems havefive wires—three hot, one neutral and one ground

(a) Inertia of Rest:The inability of a body to change by itself its state of rest is known as Inertia of Rest.

Examples:

(i) Person sitting in a car falls backwards, when the car suddenly starts. It is because the lower portion in contact with the car comes in motion where as the upper part tries to remain at rest due to inertia of rest.

(ii) When we shake the branch of a tree, the leave or the fruits falls down because the branches comes in motion where as the leaves or the fruit tends to remain at rest and hence gets detached.(b) Inertia of Motion:The Inability of a body to change by itself its state of uniform motion is known as Inertia of motion.

Examples:

(i) When a moving car suddenly stops the person sitting in the car falls forward because the lower portion of the body in contact with the car comes to rest whereas the upper part tends to remain in motion due to inertia of motion.

(ii) An athlete runs a certain distance before taking a long jump because the velocity acquired by running is added to the time of jump, so that it can cover a long distance.

(c) Inertia of Direction:The inability of a body to change by itself its direction of motion.

Examples:

(i) When a car moves round a curve the person sitting inside is thrown outwards in order to maintain his direction of motion due to inertia of motion.

Inertia is a tendency to do nothing or to remain unchanged.

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Makethe surfaces smoother.

Lubrication is another way tomakea surface smoother. A lubricant is a slippery substance designed toreducethefrictionbetween surfaces.

Makethe object more streamlined. ...

Reducethe forces acting on the surfaces.

Reducethe contact between the surfaces.

Armature voltage = 2πNT/60= 2*3.14*1400*2.5/60=366.6 volt

Let the mass of the stone be ‘m’.

I = ½ mr2= 50 kg m2

Torque applied say τ.

Initial angular speed = 0

Final angular speed = 150 rotations per min = 150 × 2π/60 = 5π rad/s

Time taken = 10 s

Now,

Angular acceleration, α = 5π/10 = π/2 rad/s2

We know, τ = Iα

=> τ = 50 × π/2 = 25 × 3.14 = 78.5 Nm

velocity = 36km/hr = 36*5/18 = 10m/s

work done by forces = change in K.E

and Finally the car gets stop so ∆K.E = 1/2*(m)*(10)² = 50m

so, work done my gravity = mgh = 10mh

and work done by friction along the inclined path having distance h/cos60° = 2h is = μmgcos(60)*2h= 0.1*m*10*h = mh

no equating all work done=> mh +10mh = 50m=> 11h = 50=> h = 50/11 m