1.
A kettle uses 160kJ of energy to heat the water in it from 25°C to
100°C.
1991
How much water is in the kettle in kg?

Answer:

Your mass is the same no matter where you go in the universe; your weight, on the other hand, changes from place to place. Mass is measured in kilograms; even though we usually talk about weight in kilograms, strictly speaking it should be measured in newtons, the units of force

In summary, mass is a measure of how much matter an object contains, and weight is a measure of the force of gravity acting on the object. ... The amount of gravity is directly proportional to the amount of mass of the objects and inversely proportional to the square of the distance between the objects.

Explanation:

The potential, kinetic and total energy at the top are 2.38 x 10⁷ Joule,  0 Joule, 23.8 x 10⁶ Joule respectively and the potential, kinetic and total energy at the bottom are 0 Joule, 2.448 x 10⁶ Joule, 2.448 x 10⁶ Joule  respectively. moreover the total energies are not same as not all potential energy converting into Kinetic energy of vertically drop of ride as the ride moves straight afterwards so that also need some energy which is again coming from potential energy.

Energies at the top:-

Potential energy = mgh

Potential energy  = 3.4 x 10⁴  × 10 × 70 Joule

Potential energy  = 2.38 x 10⁷ Joule

Kinetic Energy = (1/2) mv²

Kinetic Energy = (1/2) × 3.4 x 10⁴ × 0²

Kinetic Energy = 0 Joule

Total Energy = Potential Energy + Kinetic Energy

Total Energy = ( 23.8 x 10⁶ Joule ) + ( 0 Joule )

Total Energy = 23.8 x 10⁶ Joule

Energies at the bottom:-

Potential energy = mgh

Potential energy  = 3.4 x 10⁴  × 10 × 0 Joule

Potential energy  = 0 Joule

Kinetic Energy = (1/2) mv²

Kinetic Energy = (1/2) × 3.4 x 10⁴ × 12²

Kinetic Energy = 2.448 x 10⁶ Joule

Total Energy = Potential Energy + Kinetic Energy

Total Energy = ( 0 Joule ) + ( 2.448 x 10⁶ Joule )

Total Energy = 2.448 x 10⁶ Joule

The total energies are not the same since not all potential energy is converted into Kinetic energy of the vertical drop of the ride as the ride travels straight thereafter thus that also requires some energy which is again derived from potential energy.

So we have calculated the potential, kinetic and total energy at top and bottom both, and also stated the reason of why total energy at the top is not equal to the total energy at the bottom.

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Answer:

Explanation:

The sense of weightlessness in orbiting satellite is because of the lack of any contact-forces. ... Thus, both the astronaut and the satellite have the same value of g, which is again equal to the centripetal acceleration of the satellite. These two neutralize each other, causing everything to appear weightless.

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Answer:

5 km=5 × 10³ m

Explanation:

1 km=1 × 10³ m

Using unitary method,

5 km= 5×10³ m

Hope it helps.

Answer:

\( \Huge{\boxed{6.27 m/s²}} \)

Explanation:

The acceleration of the car given it's mass and the force acting on it can be found by using the formula

\( acceleration = \frac{force}{mass}\\ \)

From the question

force = 9079 N

mass = 1447 kg

We have

\( acceleration= \frac{9079}{1447}\\ = 6.27436 \)

We have the final answer as

An unbalanced force acting on an object results in the object's motion changing. The object may change its speed (speed up or slow down), or it may change its direction. Friction is a force that resists the motion or the tendency toward motion between two objects in contact with each other.

motion

Answer:

motion. FILLER FILLER FILLER

Answer:

Explanation:

Steam spins turbine blades, turning a generator shaft to create electricity.

Heat energy is converted to mechanical energy and then electricity.

Answer:

That move is called a pivot foot.

Explanation:

The total charge flown across any cross section of the wire in time interval 0-T is determined from the area under the curve as ¹/₂i₀T.

option (2) is the correct answer.

The total charge flown across any cross section of the wire in time interval 0-T is calculated as follows;

The total charge flowing = area under the curve

area under the curve = ¹/₂ x base of the triangle x height of the triangle

area under the curve = ¹/₂ x T  x i₀

area under the curve = ¹/₂i₀T

Thus, the total charge flown across any cross section of the wire in time interval 0-T is determined from the area under the curve as ¹/₂i₀T.

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The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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An object has gravitational potential energy due to its an position relative to the gravitational field it is in.

The gravitational potential energy is determined by the mass of the object, the gravitational constant, and the distance between the object and the source of the gravitational field.

Gravitational potential energy is a type of potential energy that an object can have due to its position in a gravitational field. It is the energy that is stored in an object due to its position in a gravitational field and can be converted into other forms of energy.

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Answer:

Light is made up of different wavelengths, or colors, and white light is a combination of all of them. When a ray of white sunlight hits a patch of beach ball, the paint absorbs most of the wavelengths. It reflects the rest. For example, if the patch is blue, it reflects the blue wavelengths and absorbs all the others.

We see different wavelengths of light as different colors because they are associated to different wavelength, which activates different cells in the retina.

The direction of the induced current in the wire loop is anti-clockwise.

The direction of the induced current if the wire loop was on the left side of the wire is clockwise.

Lenz's law and the direction of the induced current are the key concepts needed to address this issue.

To determine the direction of the induced current under various circumstances, use Lenz's law.

The induced emf of the coil is proportional to the negative of the rate of change of magnetic flux, according to Faraday's law.

The following expression represents the typical emf that is generated in the coil during the course of the time period: \($$\varepsilon=-\frac{\Delta \Phi}{\Delta t}$$\)

Here, \($\varepsilon$\) is the average emf that is induced in the coil during the time interval and \($\Delta \Phi / \Delta t$\) is the rate of change of magnetic flux.

A magnetic field is induced in the rectangular loop as a result of the current in the wire. The plane is the intended target of this magnetic field.

As the current in the wire grows, the magnetic flux in the rectangular coil rises.

An emf and current are induced by Faraday's law.

Following is noted from Lenz's law:

The inwards growing flux is opposed by the generated current. Therefore, the induced current must flow counterclockwise in order to meet this.

When the rectangular loop is kept to the left of the wire, the magnetic flux will be directed outward.

If the wire loop was on the left side of the wire, the induced current would flow clockwise.

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Answer:

Mitochondria and plastids are the two organelles that contain their own genetic material. Both these organelles have their own DNA and ribosomes.

The total distance is 323.21 km. To solve these vector addition problems, we'll use the Law of Sine and Law of Cosine. Let's start with the first problem.

1) V1 = 25 N N 45 E and V2 = 35 N, 5 450 E

Step 1: Convert the vectors to their components.
V1 = 25N at an angle of 45° east of north. Its components are:
V1x = 25N * sin(45°) = 17.68N
V1y = 25N * cos(45°) = 17.68N

V2 = 35N at an angle of 450° east of north. Its components are:
V2x = 35N * sin(45°) = 24.75N
V2y = 35N * cos(45°) = 24.75N

Step 2: Add the components of the vectors.
Vx = V1x + V2x = 17.68N + 24.75N = 42.43N
Vy = V1y + V2y = 17.68N + 24.75N = 42.43N

Step 3: Find the magnitude and direction of the resultant vector.
Magnitude: R = sqrt(Vx^2 + Vy^2) = sqrt(42.43N^2 + 42.43N^2) = 59.95N

Direction: θ = atan(Vy / Vx) = atan(42.43N / 42.43N) = 45°

Therefore, the resultant vector R is 59.95N at an angle of 45°.

2) D1 = 200 km, 30' W and D2 = 300 km, 60' W

Step 1: Convert the distances to their components.
D1 = 200 km, 30' W. Its component is:
D1x = -200 km * cos(30') = -173.21 km

D2 = 300 km, 60' W. Its component is:
D2x = -300 km * cos(60') = -150 km

Step 2: Add the components of the distances.
Dx = D1x + D2x = -173.21 km + (-150 km) = -323.21 km

Step 3: Find the total distance.
D = abs(Dx) = abs(-323.21 km) = 323.21 km

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The  helicopter flies 165m horizontally and then moves downward 45m below so ,the helicopter's resultant displacement is 171 m.

What is resultant displacement ?

Resultant displacement is defined as the the shortest distance from initial point of movement to the final point of movement.

What is Pythagoras theorem ?

Pythagoras theorem is defined for a right angled triangle as the square of the hypotonus being equal to sum of square of base and square of perpendicular.

given :

helicopter flies horizontally a displacement  (x) = 165m

helicopter flies vertically a  displacement  (y)= 45m

the above condition can be imagined in a 2-D graph or plane with x and y axis

and since the curve will be a sharp 90° the resultant figure is of a right angled triangle.

therefore,

using Pythagoras theorem we get;

( resultant displacement  )²= (165)² + (45)²

( resultant displacement  ) = 171 m

The  helicopter flies 165m horizontally and then moves downward 45m below so ,the helicopter's resultant displacement  is 171 m.

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Answer:

There is an inverse relationship between distance and light intensity - as the distance increases, light intensity decreases. This is because as the distance away from a light source increases,..

Explanation:

The light intensity decreases as magnification increases. There is a fixed amount of light per area, and when you increase the magnification of an area, you look at a smaller area. So you see less light, and the image appears dimmer. Image brightness is inversely proportional to the magnification squared.

Answer:

Object 2, which has a density of 1.9 g/cm3, since it has more density than freshwater.

Answer:

The answer is B.

Explanation:

Answer: she will do double the work

Explanation:

100N×200m= 20000

Force applied by the girl is 100 Newtons

Displacement is twice :

\( \large \boxed{ \mathrm{work \: \: done = f \times d}}\)

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Answer:

mass is 56.25 N

Explanation:

F=ma

325=4m

m=325/4

A 2-meter long massless rod supports a 12-Newton weight. The left end of the rod is held in place by a frictionless pin. In each case, a vertical force F is applied at different positions along the rod.

When the vertical force F is applied at the left end of the rod (0 meters from the left end), the entire weight of 12 Newtons is supported by the left end, and there is no force acting on the right end of the rod. The left end acts as a pivot point, and the rod remains in rotational equilibrium.

When the vertical force F is applied at the midpoint of the rod (1 meter from the left end), the weight of 12 Newtons is evenly distributed between the left and right ends of the rod. Each end supports a force of 6 Newtons. The rod remains in rotational equilibrium as the torques on both sides of the pivot point are balanced.

If the vertical force F is applied beyond the midpoint, closer to the right end of the rod, a greater portion of the weight is supported by the right end. This results in an imbalance of torques, causing the rod to rotate counterclockwise around the left end.

In summary, the distribution of weight and the position of the applied force determine the rotational equilibrium of the rod. When the applied force is at the left end, the rod remains stable. When the force is at the midpoint, the rod is also in equilibrium. However, if the force is applied beyond the midpoint, the rod will rotate.

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Answer:

An electromagnet is the device through which runs current and it creates a magnetic field.

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Answer:

0.25

Explanation:

According to newtons law of motion

\sum F_x = ma

F_f =  ma

nR = ma

nmg = ma

ng = a

n = a/g

g is the acceleration due to gravity

Given

a = 2.42m/s²

g = 9.8m/s²

Substitute into the formula;

n = 2.42/9.8

n = 0.25

Hence the coefficient of kinetic friction is 0.25

Answer:

0.247

Explanation:

I had the same question and this is the correct answer.

\(\displaystyle F_n = 9.8 \ N\)

Math

Pre-Algebra

Order of Operations: BPEMDAS

Physics

Forces

SI Unit: Newtons N

Free Body Diagrams

Gravitational Force: \(\displaystyle F_g = mg\)

Normal Force: \(\displaystyle F_n\)

Newton's Law of Motions

Step 1: Define

1 kg book at rest

Step 2: FBD

See Attachment

Draw a free body diagram to label the forces acting upon the book. We see that we would have gravitational force from Earth pointing downwards and normal force from the surface of the desk pointing upwards.

Since the book is not moving, we know that ∑F = 0 (sum of forces equal to 0).

Step 4: Find Normal Force

Answer:

When a magnet is dropped through a tube, the direction of the induced current below the magnet, as viewed from above, follows Lenz's Law. Lenz's Law states that the induced current will flow in a direction that creates a magnetic field opposing the change in the magnetic field that induced it.

As the magnet falls through the tube, its motion creates a changing magnetic field. According to Lenz's Law, the induced current will produce a magnetic field that opposes the motion of the magnet. This means that the induced current will create a magnetic field that points upward, opposite to the downward motion of the magnet.

Therefore, the direction of the induced current below the magnet, as viewed from above, would be in a clockwise direction.

Answer:

An atom is the smallest unit of ordinary matter that forms a chemical element.

Matter is composed of very tiny or microscopic particles called "Atom".

(According to Dalton atomic theory some of his principles were wrong and later was corrected but the definition of an atom was right in his theory).

The greenhouse effect occurs because of the absorption and re-emission of infrared radiation by the atmosphere.

When visible light from the sun enters the earth, it passes through the atmosphere and is absorbed by materials on the earth's surface like rocks, soil and the ocean, which makes the earth heat up. These materials then re-emit infrared radiation. This radiation gets reabsorbed by certain gases in the atmosphere called greenhouse gases, further keeping the earth warm. This effect is known as the greenhouse effect.

The greenhouse effect is essential for all life on earth, as without it, the earth would be a cold, frozen place. However, the level of greenhouse gases in the atmosphere has increased in recent years, further increasing the temperature of the planet, resulting in what is called global warming.

The greenhouse gases include water vapour, methane, carbon dioxide and ozone.

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