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11111 K

16379274 k

ANSWER:

As density =

volume

mass

∴ρ=

3

4

πR

3

M

=

4

3

4πR

3

M

∴ The percentage error in density is

ρ

Δρ

×100% =(

M

ΔM

+3

R

ΔR

)×100%

=3% +3(2%)=3% +6% =9%

ANSWER:

velocity at top is 70 m

Explanation:

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a) 9.8 N

...................

ANSWER:

NH4+ is a composite radical

Explanation:

The ammonium ion is the only POSITIVE composite ion.

A positive ion is one which, contains more than one TYPE of elements in it. Here ammonium ion contains nitrogen and hydrogen. So it is composite.

EXPLANATION:

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Answer:

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Explanation:

yes mam I will be there at least one of us will be there at least one of us will be there at least one of us will be there at least one of us will be there at least one of us will be there at least one of us will

ANSWER:

The metal types commonly USED to MAKE jewelry include GOLD, Platinum, PALLADIUM, Titanium, Silver, Tungsten and Stainless Steel.

Explanation:

Since pressure is DIRECTLY proportional to force, increase the force. B) If you want to increase pressure while keeping force unchanged, you have to CHANGE AREA. Since pressure is inversely proportional to area, DECREASE the area.

Answer:

FORCE CHANGES DIRECTION OF MOTION - EXAMPLE

When a ball hits against a wall, it bounces BACK in the OPPOSITE direction. So the force exerted by the wall on the ball changes its direction of motion.

FORCE CHANGES SHAPE OF OBJECT - EXAMPLE

When a hammer strikes a hot rod, the rod bends. The force exerted by the hammer on the rod changes the shape of the rod.

EXAMPLES FOR EFFECT OF FORCE - EXAMPLE

Force may bring the following change:

1) Can change the state of an object(rest to motion/ motion to rest):For example, pushing a heavy stone in order to move it.

2) May change the speed of an object if it is already moving.For example,catching a ball hit by a batsman.

3) May change the direction of motion of an object.For example,footballer kicks a   moving ball to change its direction.

4) May bring about a change in the shape of an object.For example, blowing air in balloon.

5) May cause some or all of these effects.

FORCE CAN CHANGE THE DIRECTION OF AN OBJECT - EXAMPLE

A side wind can change the direction of a boat SAILING in a sea.

FORCE CAN CHANGE THE SPEED OF AN OBJECT - EXAMPLE

Blowing wind or wind STORM can change the speed of moving car.

Answer:

ANSWER

Side of square=1m

Distance between CENTRE and CORNER=

2

1

m

I=∑M

i

R

i

2

I= 1(

2

1

)

2

+1(

2

1

)

2

+1(

2

1

)

2

+1(

2

1

)

2

=2kgm

2

Answer:

A FORK consists of two tines and a handle. When it is hit with rubber hammer, the two tines starts vibrating. The back and forth motion of tines PRODUCES disturbances in the surrounding air molecules. As the tines extend outward from their original position, they compress surrounding air molecules which RESULTS in the creation of high-pressure region close to the TINE. When the tine moves inwards, it produces a low pressure region near the tine. With more vibrations of tine, an alternating pattern of high and low pressure regions are created. These pressure difference regions help in propagation of sound waves from one location to another.

ANSWER:

HOPE it HELPS........

Explanation:

A HYPOTHESIS is a leading question put to nature, a guess designed to SUGGEST the SORT of inquiry by which an ANSWER MIGHT be reached. It is a proposition which seems to explain observed facts and whose truth is assumed tentatively for the purposes of investigation

ANSWER:

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ANSWER:

The GOAL of objective measurement is to produce a reference standard common currency for the exchange of quantitative VALUE, so that all research and practice relevant to a PARTICULAR variable can be conducted in uniform terms.

Objective measurement is something that is measured consistently. For example, measuring how well someone can perform a SET number of tasks in a controlled environment. ... Objective data is not influenced by opinion or perspectives of others.

Answer:

KINETIC energy is an OBJECT is the energy that it possesses due to its motion.

Explanation:

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Answer:

AEROBIC

Explanation:

Getting regular physical activity, ESPECIALLY aerobic EXERCISE, can improve cardiorespiratory ENDURANCE. Aerobic exercises can help promote heart and lung health and improve how well the body circulates and utilizes OXYGEN.

ANSWER:

FIND the answer in the ATTACHMENT

The split RING has the function of reversing the current at that point. When a dc motor SHAFT comes into contact with a split ring, the split ring reverses the current to maintain the shaft torque in a MAGNETIC field.

EXPLANATION:

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Hope this is helpful to you.....

A POWER plant that produces electricity by using flowing WATER to rotate a turbine (which drives the GENERATOR), is called hydro-power plant (or hydroelectric power plant). The electricity produced by using the energy of FALLING water (or flowing water) is called hydroelectricity

1 ANSWER. The two CASES can be there for the position of object with respect to the pole of the mirror: ... When object is placed between pole and FOCUS of concave mirror and the distance is less than 15 cm, the image obtained will be a MAGNIFIED, erect and virtual image.

Answer:

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Answer:

In physics, motion is the phenomenon in which an OBJECT changes its position over time. Motion is MATHEMATICALLY described in terms of DISPLACEMENT, distance, velocity, acceleration, speed, and time. ... One can also SPEAK of motion of images, SHAPES and boundaries.

body at motion means the object changes its position with passage of time.ex: rotating blades of the fan,moving vehicle etc.

ANSWER:

Velocity Gradient is DEFINED as rate of change in velocity per UNIT of distance. Mathematically, Velocity Gradient= velocity/distance.

Dimension is T-1

Answer:

This is FALSE. METER SCALE is USED to measure the linear distance.

ANSWER:

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Answer:

THEREFOR, K. E=M/N X 2 x COS 60°=M/N J

Answer:

The pressure exerted by a static LIQUID DEPENDS only on the DEPTH, density of the liquid, and the acceleration DUE to gravity. As a result, pressure within a liquid is therefore a function of depth only, with the pressure INCREASING at a linear rate with respect to increasing depth.

Answer:

The specific heat is the amount of heat per unit mass required to raise the temperature by ONE degree CELSIUS. The relationship between heat and temperature change is usually expressed in the form shown below where c is the specific heat.

Explanation:

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When you turn the KEY, you're tightening a sturdy METAL spring, called the mainspring, and STORING up energy; the mainspring is the mechanical equivalent of a battery. ... Tightening the mainspring in a windup TOY is LIKE pushing a rollercoaster car up a hill.

Hope it helps you...

Solution :-

As per the given data ,

• Speed of  car A = 36 km / hr = 36 x 5 / 18 = 10 m /s

• Speed of Car B = 54 km / hr = 54 x 5 / 18 = 15 m /s

• Speed of Car C = - 54 km / hr = - 15 m /s

Speed of Car B with respect to A (VBA)

= Vb - Va

= 15 - 10  

= 5 km / hr

Speed of car C with respect to A (Vca)

= Vc - Va

= -15- 10

= - 25 km / hr

Time required by the C to overtake car A

we know that ,

⇒ speed = distance / time

⇒ time = distance / speed

hence ,

⇒ t = 1000 / 25

Now as per the question , B NEEDS to overtake A before C does in order to do that he has maximum 40 s

Now we need to find the minimum ACCELERATION of the car B required to avoid accident ,

By using second equation of motion ,

⇒ S = Vba x t + a t² / 2

⇒ 1000 = 5 x 40 + a x 1600 /2

⇒ 1000 = 200 + a x 800

⇒ 800= 800 a

⇒ a = 1 m /s ²

The maximum acceleration of the car in order to avoid accident is 1 m /s²

Explanation:

To CONSTRUCT a ray diagram, we use two LIGHT RAYS which are so chosen that it is easy to know their directions after reflection from the lens. ... Use these two rays to locate the image of an object placed between 'F' and '2F' of a CONVEX lens.

Answer:

BODY can execute natural vibrations at a PLACE where no external forces are acting, and this is VACUUM

Answer:

Both fission and fusion are NUCLEAR processes by which atoms are altered to create energy, but what is the DIFFERENCE between the two? Simply PUT, fission is the division of one ATOM into two, and fusion is the COMBINATION of two lighter atoms into a larger one. ... Nuclear fission releases heat energy by splitting atoms

Explanation:

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Answer:

the answer is

EXPLANATION:

The average AC POWER is found by multiplying the rms VALUES of current and voltage.

Ohm's LAW for the rms ac is found by dividing the rms voltage by the impedance.

In an ac circuit, there is a phase angle between the source voltage and the current, which can be found by dividing the resistance by the impedance.

Explanation:

The algebraic EXPRESSION used to determine the change incurred from one point to ANOTHER with a UNIT is referred to as differentiation. On the other hand, integration is an algebraic expression used in CALCULATING the area under the curve because it is not a perfect shape after which area can easily be calculated.

For EXAMPLE, the CGS unit of force is the DYNE, which is defined as 1 g⋅cm/s², so the SI unit of force, the newton (1 kg⋅m/s2), is equal to 100000 dynes.

ANSWER:

The distance between DAVID and the MIRROR is EQUAL to the distance between the mirror and his image. When he MOVES 1 m towards the mirror, he is at a distance of 3m (4m - 1m) from the mirror. Thus, the distance between David and his image will be = 3m + 3m = 6m.

ANSWER:

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Explanation:

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Answer:

Things which weigh more than 1 KG are School bag, a BRICK and a big pumpkin. Things which weigh LESS than 1 kg are Geometry box, slippers/shoes.

Explanation:

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Answer:

40N

Explanation:

f=ma

=20*2

=40N

okay

Answer: 17 m from the stop LINE not crossing the traffic lights

Explanation: the car will decelerate between time INTERVAL .7s at 4.5 ms^2.

so distance COVERED= 8 m formula used s=ut=1/2at^2

8m is LESS than 25m so 25-8=17m from the sto line.

Radius of gyration or gyradius of a body about an axis of rotation is DEFINED as the RADIAL distance to a POINT which would have a moment of INERTIA the same as the body's actual distribution of mass, if the total mass of the body were concentrated.

Speed, being a SCALAR quantity, is the rate at which an object covers DISTANCE. The average speed is the distance (a scalar quantity) per time ratio.

Velocity is the rate at which the position CHANGES. The average velocity is the DISPLACEMENT or position change (a VECTOR quantity) per time ratio.

ANSWER:

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..,..,..................

EXPLANATION:

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The torque on a given AXIS is the product of the moment of inertia and the angular acceleration. The UNITS of torque are Newton-meters (N∙m). Torque Formula Questions: 1) The moment of inertia of a SOLID disc is , where M is the MASS of the disc, and R is the radius.

Answer:

45n is the FORCED APPLIED on the CAR