a heater 60w evaporates 6×10–3kg of boiling water in 60s.what is the specific latent heat of vaporisation of water in jkg–1​

Answer:

2m

Explanation:

Answer:

The ball travels faster when Mike throws it.

Explanation:

Mike throws the ball harder, with a greater force, so the ball travels faster when Mike throws it than when Joe does.

Answer:

D. Concrete & E. Drywall

Explanation:

With a light shone upon the materials, Concrete and Drywall neither have a metallic sheen.

The materials that are made from non-metallic resources are granite countertops, concrete, and drywall. Hence, the correct options are A, D, and E.

Non-metallic materials are materials that lack magnetic properties like good electrical conductivity and thermal conductivity. They lack the properties like luster, rigor, and malleability. These materials are essential for many industries and are used for industrial purposes.

Non-metallic minerals do not have any metal substance in them. There is no new product is formed by the process of melting of non-magnetic materials. They do not have any shine or luster and they can break down easily. Eg: sand, gravel, etc.

From the given,

The materials that are made from non-metallic resources are Granite countertops, concrete, and drywall.

Hence, the ideal solutions are options A, D, and E.

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The non-zero Christoffel symbols are:Γ11v = -sin v Γ22v = sin v.

To find the Christoffel symbols, we can use the formula:

Γρμν = (1/2) gρσ ( ∂μ gνσ/ ∂xσ + ∂ν gμσ/ ∂xσ - ∂σ gμν/ ∂xσ )

where g is the metric tensor and x is the coordinate system.

First, let's find the components of the metric tensor g:

g11 = cosh u - cos v

g12 = g21 = 0

g22 = cos v - cosh u

Now, let's calculate the Christoffel symbols:

Γ11u = (1/2) g11 ( ∂u g11/ ∂u + ∂u g11/ ∂u - ∂u g11/ ∂u ) = 0

Γ12u = (1/2) g11 ( ∂v g21/ ∂u + ∂u g12/ ∂v - ∂u g11/ ∂v ) = 0

Γ22u = (1/2) g22 ( ∂u g22/ ∂u + ∂u g22/ ∂u - ∂u g22/ ∂u ) = 0

Γ11v = (1/2) g11 ( ∂v g11/ ∂u + ∂u g11/ ∂v - ∂v g11/ ∂v ) = -sin v

Γ12v = (1/2) g11 ( ∂v g21/ ∂u + ∂u g12/ ∂v - ∂v g11/ ∂v ) = 0

Γ22v = (1/2) g22 ( ∂v g22/ ∂u + ∂u g22/ ∂v - ∂v g22/ ∂v ) = sin v

Therefore, the non-zero Christoffel symbols are:

Γ11v = -sin v

Γ22v = sin v

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Answer:

Pulse & Heart Rate. Your heart rate is the number of times each minute that your heart beats, which is normally between 60 and 100 times per minute for adults. Your pulse is a way you can feel each time your heart beats

Explanation:

Explanation:

How are animals similar? All animals are made of many cells. Most animals can move on their own. Like all living things, animals grow, change, reproduce, and respond to their environment.

Answer:

A

Explanation:

A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.

Answer:

The value of Force is

\(f = 0.031n\)

Explanation:

Greetings!!!

Mass(m)= 0.005kg

Acceleration (a)= 6.2m/s²

Force= ?

Firstly, recall the Newton's second law.

substitute known variables into the equation.

Solve for Force.

If you have any questions or unclear ideas tag on comments.

Hope it helps!!!

The force of the bullet is  0.031 N.

The force of the bullet is calculated by applying Newton's second law of motion as shown below.

Mathematically, Newton's second law of motion is given as;

F = ma

where;

The force of the bullet is calculated as follows;

F = 0.005 kg  x  6.2 m/s²

F = 0.031 N

Thus, the force of the bullet is a function of the mass and the acceleration of the bullet.

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Answer:

The electrically charged gas particles are affected by magnetic forces.

For the past eleven years, the Sun's north geographic pole has also been home to its north magnetic pole

Explanation:

Answer:

Plants and animals that live in a biome must be able to live and reproduce in the conditions

Explanation:

Answer:

anywhere between 100000 to about 400000 human years .

Explanation:

The difference in charge between the inside and the outside of a nerve fiber when the nerve is at rest is -70 mV. This is known as the resting membrane potential. The inside of the nerve fiber has a negative charge compared to the outside. This charge difference is maintained by the active transport of ions across the cell membrane.

At rest, the nerve cell membrane is more permeable to potassium ions (K+) than to sodium ions (Na+). This creates an imbalance of ions across the membrane. The concentration of potassium ions is higher inside the cell, while the concentration of sodium ions is higher outside the cell.

The sodium-potassium pump actively transports 3 sodium ions out of the cell for every 2 potassium ions it brings in. This helps maintain the concentration gradient and the negative charge inside the cell. As a result, the inside of the cell becomes more negative compared to the outside, resulting in a resting membrane potential of -70 mV.

In summary, the difference in charge between the inside and the outside of a nerve fiber at rest is -70 mV. This is achieved through the active transport of ions, particularly potassium and sodium ions, by the sodium-potassium pump.

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Answer:

14,400m

Explanation:

The formula for calculating speed is S=D/T.

S=speed( in meters per second- m/s)

D=distance(in meters)

T=time( in seconds)

For our case:

S=40m/s

D=?

Time=2 hours=60min x 60 sec=3600seconds

Now make D the subject.

D=S x T

D=4m/s x 3600s=14,400m

Therefore our answer is

14 400 m or 14.4 km

The final volume of water in the container after increasing the temperature is 203.8 m³.

From the given,

The initial volume of water (Vο) = 200 cm³

Initial temperature = 4°C = 4+273 = 277K

Final temperature = 95°C = 273+95 = 368 K

Volume expansion co-efficient = 210×10⁻⁶(°C)⁻¹

Final volume =?

β = 1/Vο (ΔV/ΔT),  β represents the volume expansion coefficient, ΔV change in volume, ΔT is the change in temperature, and Vο is the initial volume.

ΔV = β×Vο×ΔT

     = 210×10⁻⁶×200×(368-277)

    =  210×10⁻⁶×200×91

ΔV = 3.83 m³

ΔV = final volume - initial volume

final volume = ΔV + 200

                    = 3.82 +200

                    = 203.82 m³

Final volume = 203.82 m³.

Thus, the final volume of the water is 203.82 m³.

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Answer:

It is induction

The focal length of the lens when the object is at 36 cm from the lens on the left and the image is at 22cm towards the right is 13.6 cm.

In optics, the relationship between the distance of the image (v), the distance of the object (u), and the focal length (f) of the lens are given by the formula known as the Lens formula. The Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness.

The position of the object,u= 36cm to the left of the lens.

The position of the image, v= 22 cm to the right of the lens.

According to the sign convention, if we take the direction in which the ray of light goes as the positive direction. Then u=-36cm and v=+22cm.

Now from the lens formula, 1/f=1/v-1/u, 1/f= 1/22-(-1/36), 1/f= 1/22+1/36=(36+22)/36×22 =58/792. f= 792/58 = 13.6 cm.

The focal length of the lens is 13.6cm.

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Answer:

Below are some of the important dates that led to the creation of the Constitution: 1775 — The Revolutionary War between the Colonies and Britain begins. ... 1781 — The last battle of the Revolutionary War takes place; the 13 states set up a federal government under laws called the Articles of Confederation.

Explanation:

please give me a heart

Answer:

Explanation:

Given maximum height reached by the ball as H = 40 metres

Since the ball rises straight up when hit by a ball, then the angle of launch will be perpendicular to the ground and that is 90°.

To determine the upward speed of the ball in meters per second after it got struck by the bat, we will use the formula for calculating the maximum height according to projectile motion;

Maximum Height H = \(\frac{u^2sin^2\theta}{2g}\) where;

u is the speed of the ball

\(\theta\) is the angle of launch

g is the acceleration due to gravity = 9.81m/s²

Substituting the given parameters into the formula;

\(40 = \frac{u^2sin^2(90)}{2(9.81)}\\ \\40 = \frac{u^2}{2(9.81)}\\ \\40 = \frac{u^2}{19.62} \\cross\ multiply\\\\u^2 = 40*19.62\\u^2 = 784.8\\u = \sqrt{784.8}\\ u = 28.01 m/s\)

Hence the upward speed of the ball in meters per second after it got struck by the bat is 28.01m/s.

The energy of a free photon is continuous; thus indeed, its frequency can be anything, and between any two frequencies there are an infinite number of possible frequencies.

Mathematically,

Frequency of photon = velocity of light÷ wavelength of photons

velocity of light is 3×10⁸m/s

wavelength of photons= 35 nm= 35×10⁻⁹m

substituting the given values in above formula

Frequency of photon = 3×10⁸m/s÷ 35×10⁻⁹m= 8.57×10⁻³s⁻¹

Therefore, the  frequency photon with a wavelength of 65 nm is 8.57×10⁻³s⁻¹.

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The power exerted by the man is 735 watts.

To find the power exerted by the man, we need to use the formula for power, which is:
Power = Work / Time
Work is the product of force and displacement, so we can write the formula as:
Power = (Force × Displacement) / Time

We know that the displacement is 5 meters and the time is 4 seconds. To find the force, we need to use the formula for weight, which is:
Weight = Mass × Acceleration
The acceleration in this case is the acceleration due to gravity, which is 9.8 m/s². So the weight of the man is:
Weight = 60 kg × 9.8 m/s² = 588 N

Now we can plug in the values into the formula for power:
Power = (588 N × 5 m) / 4 s = 735 Nm/s = 735 W
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Answer:

a) KINETIC ENERGY   K = 0.045 J , b) POTENTIAL ENERGY  U = 0.196 J ,

c)  KINETIC ENERGY  K = 9.45 10⁵ J, d) POTENTIAL ENERGY ,    U = 41.16 J ,

e) POTENTIAL ENERGY  U = 154.84 J , f)  ENERGY IS POTENTIAL    U = 9.31 J

g) energy is POTENTIAL   U = 189.336 J

Explanation:

a) The ball is moving with a speed, so it has KINETIC ENERGY

          K = ½ m v²

          K = ½ 10 10⁻³ 3²

          K = 0.045 J

b) The ball is at a given height therefore it has POTENTIAL GRAVITATORY ENERGY

           U = m g y

           U = 10 10-3 9.8 2

           U = 0.196 J

c) The ball has speed so it has KINETIC ENERGY

           K = ½ m v²

           K = ½ 2,100 30²

           K = 9.45 10⁵ J

d) The baby carriage is at a height whereby the POTENTIAL ENERGY

           U = mg h

           U = 0.200 9.8 21

           U = 41.16 J

e) the concrete block is at a height that has POTENTIAL ENERGY

           U = m g h

           U = 0.790 9.8 20

           U = 154.84 J

f) the hood has height, the ENERGY IS POTENTIAL

           U = 0.190 9.8  5

           U = 9.31 J

g) The roller coaster has height and speed, therefore the mechanical energy has a scientific part and a potential part, in general the speed at the top of the mountain is very small, so we can consider that almost all the energy is POTENTIAL

The value they give allows calculating the potential energy

            U = 9.660 9.8 2

            U = 189.336 J

The answer to all the questions on potential energy and kinetic energy have been done below;

A) We are told that the ball is rolling. An object in motion has kinetic energy. Formula for kinetic energy is;

K =  ½mv²

We have; m = 10 g = 0.01 kg and v = 3 m/s

K = ½ × 0.01 × 3²

K = 0.045 J

B) We are told that the ball is held at a height. This means it is at rest and any object at rest has Potential Energy. Formula for potential energy is;

PE = mgh

We have; m = 10g = 0.01 kg and h = 2 m

PE = 0.01 × 9.8 × 2

PE = 0.196 J

C) Like in A above, the ball is in motion. Thus, it has kinetic energy.

K = ½ × 2.1 × 30²

K = 945 J

D) The baby carriage is sitting at rest and therefore has potential energy.

PE = 0.2 × 9.8 × 21

PE = 41.16 J

E) The toy car is in motion and has kinetic energy. Thus;

K = ½ × 1.12 × 4²

K = 8.96 J

F) The cinder block is sitting at rest and has potential energy. Thus;

PE = 0.79 × 9.8 × 20

PE = 154.84 J

G) The bell is at the top of the tower and is at rest and thus has potential energy.

PE = 0.19 × 9.8 × 5

PE = 9.31 J

g) The rollercoaster is at the top at rest and so has potential energy.

PE = 9.66 × 9.8 × 2

PE = 189.336 J

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The Sun is a main-sequence star which is also known as G2V.

It can also known as yellow dwarf because of its yellow colour. It was formed about 4.6 billion years ago from the gravitational collapse of matter of a large molecular cloud.

So we can conclude that the Sun is a main-sequence star which is also known as G2V.

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Answer:

Matching principle

Explanation:

Matching principle is an accounting principle for recording revenues and expenses. It requires that a business records expenses alongside revenues earned.

Answer:

b

Explanation:

your welcome :)

Answer:

Explanation:

KE =1/2mv²

KE =1/2(1000kg)(15m/s)²

KE = 500kg (225 m²/s²)

KE = 112,500 JJ

Answer:

If a piece of iron is brought near a permanent magnet, the electrons within the atoms in the iron orient their spins to match the magnetic field force produced by the permanent magnet, and the iron becomes “magnetized.”

Explanation:

i dont know how to add align and domain

An illustration of the impact of Frontier justice is the idea that people have the right to use fatal force against others who enter their house.

What is Frontier justice?

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