An electric kettle has a power rating of 2.4kW. How long does it take the kettle to heat up 4.5kg of tap water from 28°C to 100°C ? (c of water = 4200Jkg1°C-) What assumption must you make to arrive the answer ?

pls helppp....

Answer:

[Ne] 3s² 3p¹

Explanation:

Answer: 1s2 2s2 2p6

Explanation:

The aluminum ground state would be 1s2 2s2 2p6 3s2 3p1.

However, the Aluminum Ion electron configuration would be 1s2 2s2 2p6 as it has LOST 3 electrons to have the noble gas configuration of Neon (Ne)

Answer:

I think its c) no unit

Explanation:

jus took test and got a 100

Answer:

You subtract the atomic number from the atomic mass to find the number of neutrons alone

Explanation:

The atomic number is the number of protons OR electrons. They are both equal thus making the atom have a neutral charge. The relative atomic mass is the number of protons AND neutrons.

Answer:

Heat is kinetic energy -- the higher the temperature of a substance, the faster and farther its molecules move.

Explanation:

... Conversely, when heat transfers from your beverage to the ice and the temperature of the liquid drops, the molecules in the beverage slow down. When those molecules slow down, their kinetic energy decreases.

The correct option is B, The approximate share of the audience for the game would be 44%.

We know that 50% of the households had their television sets turned on, which is 0.5 times 900,000 = 450,000 households.

Out of those 450,000 households, 200,000 were watching the game.

So, the share of the audience for the game is:

(200,000 / 450,000) x 100% = 44.44%

Rounded to the nearest whole number, the approximate share of the audience for the game is 44.

A market is a platform where buyers and sellers come together to exchange goods, services, or information. It can be physical or virtual, and can range from local street markets to global stock exchanges. The basic principle of a market is to create a mutually beneficial transaction between the buyer and the seller.

In a market, prices are determined by the forces of supply and demand. If there is a high demand for a particular product or service, and a limited supply, the price will be higher. Conversely, if there is a low demand and an abundant supply, the price will be lower.

Markets play a crucial role in the economy as they allocate resources efficiently and promote competition, which drives innovation and growth. The size and structure of a market can vary greatly, and it can be influenced by factors such as consumer preferences, technological advancements, government regulations, and global events.

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A "screen" or even just a set of parallel bars are highly reflective to electromagnetic waves as long as the open spaces are small compared to the wavelengths.

"Grid" dishes work fine ... with less weight and less wind resistance ... for frequencies below about 3 GHz. (Wavelengths of at least 10 cm.)

(I even worked on a microwave system in South America where huge grid dishes were used on a 90-mile link.)

Answer:

Radiotherapy

Explanation:

Answer:

Radioisotopes are used in medicine as tracers to detect and diagnose medical problems. Radioisotopes are also used in radiation therapy to treat cancer.

Explanation:

sample answer on edge:3

The gravitational energy accelerates the object converting the gravitational potential energy into mechanical energy.

The combination of the potential and kinetic energy due to the gravitational force of the Earth leads to the formation of mechanical energy. The capacity of an object to draw nearby bodies closer to it is known as gravitational energy.

The gravitational attraction of the object transforms its gravitational potential energy into kinetic energy, converting gravitational energy to mechanical energy.

Any gravitational energy held by an object will be transformed into mechanical energy once it is subjected to an external force or falls freely from a height.

Therefore, The gravitational energy accelerates the object converting the gravitational potential energy into mechanical energy.

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The spring constant is 974.7 N/m

To find the spring constant, you can use the formula for the period of oscillation of a mass-spring system:
\(T = 2\pi \sqrt{m/k\)
where T is the period of oscillation, m is the mass, and k is the spring constant. Given the mass (m) is 5.0 kg and the period of oscillation (T) is 0.45 s, you can rearrange the formula to solve for k:
\(k = m / (T / (2\pi ))^2\)
Now, plug in the values:
\(k = 5.0 / (0.45 / (2\pi ))^2\)
First, calculate the value in the parentheses:
\(0.45 / (2\pi ) ≈ 0.0716\)
Now, square this value:
\(0.0716^2 =0.00513\)
Finally, divide the mass by the result:
k = 5.0 / 0.00513 ≈ 974.7 N/m

Therefore, the spring constant is approximately 974.7 N/m.

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Let F₁ and F₂ denote the two forces, and R the resultant force.

F₁ and F₂ point perpendicularly to one another, so their dot product is

F₁ • F₂ = 0

We're given that one of these vectors, say F₁, makes an angle with R of 30°, so that

F₁ • R = ||F₁|| ||R|| cos(30°)

But we also have

F₁ • R = F₁ • (F₁ + F₂) = (F₁ • F₁) + (F₁ • F₂) = F₁ • F₁ = ||F₁||²

So, knowing that ||R|| = 100 N, we get that

(100 N) ||F₁|| cos(30°) = ||F₁||²

(100 N) cos(30°) = ||F₁||

||F₁|| ≈ 86.6 N

(And the same would be true for F₂.)

Answer:

Approximately \(73.6\; {\rm m\cdot s^{-1}}\).

(\(v = (1/2)\, g\, t\), assuming that \(g = 9.81\; {\rm m\cdot s^{-2}}\).)

Explanation:

Assume that the air resistance on the ball is negligible. Let \(v\) denote the initial velocity of the ball.

The kinetic energy of the ball will be conserved. Hence, when the ball returns to the starting position, the ball will be travelling at the same speed but in the opposite direction (downwards.) The velocity will become \((-v)\).

The change in the velocity of the ball would be \(\Delta v = ((-v) - v) = (-2\, v)\).

Change in velocity is also equal to \(a\, t\), where \(a\) is acceleration and \(t\) is the time required to achieve such change. Under the assumptions, acceleration of the ball will be constantly \(a = (-g)\). Hence:

\(\Delta v = a\, t = (-g)\, t\).

Since \(\Delta v = ((-v) - v) = (-2\, v)\):

\((-2\, v) = \Delta v = (-g)\, t\).

\(\begin{aligned}v &= \frac{(-g)\, t}{(-2)} = \frac{g\, t}{2}\end{aligned}\).

Substitute in \(g = 9.81\; {\rm m\cdot s^{-2}}\) and \(t = 15.0\; {\rm s}\) to obtain:

\(\begin{aligned}v &= \frac{g\, t}{2} \\ &= \frac{(9.81)\, (15.0)}{2}\; {\rm m\cdot s^{-1}} \\ &\approx 73.6\; {\rm m\cdot s^{-1}}\end{aligned}\).

Given data

*The given horizontal piper of diameter is D = 3.0 cm = 0.03 m

*The given depth is d = 5.0 m

*The given water desnsity is

(a)

The magnitude of the frictional force between the plug and pipe wall is given as

*Here r = d/2 is the radius

Substitute the values in the above expression as

(b)

The volume flow rate is calculated as

The total volume is calculated as

Any item that is at rest has zero momentum. At rest, there is no “mass in motion” or momentum for the object. For the purpose of comparing the momentum of two objects, mass and velocity are both significant factors. Thus, option A is correct.

A force accelerates an object if it acts in the same direction as the object's motion. A force will alter an object's velocity either way. Additionally, if an object's velocity changes, its momentum will as well.

Therefore, In a collision, an object encounters a force for a predetermined period of time, changing the velocity of its mass (i.e., that results in a momentum change). The impulse-momentum change theorem refers to this.

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Answer:

6km

Explanation:

4km + 2km = 6km

Answer:

Broccoli

Explanation:

Answer:

b. broccoli

Explanation:

took the quiz

hope this helps

The types of microscopes that reveals the surface features of small molecules is an atomic force microscope.

The Atomic Force Microscope (AFM) is useful for imaging the surface topography of living, soft materials in their natural settings. It can be used to examine the inherent elastic modulus and receptor-ligand interactions of cells and extracellular matrix, among other mechanical properties. SEM pictures can investigate surface features that are several tenths of a nanometer in size, but AFM resolution is less than 0.1 nm. As a result, AFM can discern objects on flat surfaces with molecular dimensions.

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The perpendicular component of a displacement factor with a magnitude of 20 m is 20 m as well. When an object moves from its initial position to a final position, the displacement is the straight-line distance between the two positions and the direction of the displacement is from the initial position to the final position.

A perpendicular component is created when the displacement vector is resolved into two components. When a displacement vector is divided into two perpendicular components, the magnitude of each component is found using the Pythagorean theorem. The Pythagorean theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

This theorem is represented mathematically as: a² + b² = c².Where c is the length of the hypotenuse, and a and b are the lengths of the other two sides of the triangle. In this case, the hypotenuse represents the displacement vector, and the two other sides represent the components of the displacement vector that are perpendicular to each other. Therefore, the perpendicular component of a displacement factor with a magnitude of 20 m is 20 m as well.

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The lift on the car is 11,760 N and the work done by the lift to raise the car 5 meters off the ground is 58,800 J.

What is Hydraulic lift?

A hydraulic lift is a device used to raise heavy objects using a liquid, usually oil, which is stored in a closed system. It consists of two pistons that are connected by a pipe and filled with oil. When a force is applied to the smaller piston, it creates pressure in the oil, which is transmitted to the larger piston, causing it to rise and lift the heavy object.

The lift force on the car is equal to the weight of the car, which can be calculated using the formula:

Weight = mass x gravity

where mass is the mass of the car and gravity is the acceleration due to gravity, which is approximately 9.8 m/\(s^{2}\)

Weight = 1200 kg x 9.8 m/\(s^{2}\)

Weight = 11,760 N

To lift the car 5 meters off the ground, the mechanic must do work against the force of gravity. The work done is equal to the force multiplied by the distance lifted, which can be calculated using the formula:

Work = force x distance

Work = 11,760 N x 5 m

Work = 58,800 J

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Answer:

zero

it ends at the starting point

Explanation:

A tank whose bottom is a mirror is filled with water to a depth of 19.8 cm . a small fish floats motionless 6.40 cm under the surface of the water.The apparent depth of the fish when viewed at normal incidence to the water is approximately 4.81 cm.

To find the apparent depth of the fish when viewed at normal incidence to the water, we can use the concept of apparent depth and the Snell's law.

The apparent depth (D') of an object submerged in a medium can be calculated using the formula:

D' = D / n

Where D is the actual depth of the object and n is the refractive index of the medium.

In this case, the actual depth of the fish is 6.40 cm and the refractive index of water is 1.33.

Plugging in the values into the formula, we get:

D' = 6.40 cm / 1.33

Calculating this, we find:

D' ≈ 4.81 cm

Therefore, the apparent depth of the fish when viewed at normal incidence to the water is approximately 4.81 cm.

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Answer:

20.4375 seconds.

Explanation:

Wattage = Work / time

Work = f * d

F = mass * acceleration

mass = 5000 kg

acceleration = force of gravity

acceleration = 9.81

Force = 5000 * 9.81

Force = 49050 N

Work = F * d

d = 2.5

Work = 49050 * 2.5

Work = 122625 Joules

Wattage = Work / time

time = work / wattage

wattage = 6000 watts

time = 122625 / 6000

time = 20.4375 seconds.

Explanation:

potential energy = mass × gravity force × height

5000 = 50 ×10 ×h

5000= 500×h

h = 5000÷500

h = 10 m

The molar mass of a compound can be found by adding the molar masses of all of the atoms in the compound.

The molar mass of an atom can be found on the periodic table by looking at the atomic mass listed for that element.

For example, to find the molar mass of water (H2O), we would add the molar masses of two hydrogen atoms (2 x 1.01 g/mol) and one oxygen atom (16.00 g/mol) to get a total molar mass of 18.02 g/mol.

Another way is by finding the molecular formula of the compound, it can be done by analyzing the compound's chemical and physical properties and then using the mass spectrometer to determine the molecular weight.

In conclusion, the molar mass of a compound can be found by adding the molar masses of the atoms in the compound using the atomic masses listed on the periodic table, or by determining the molecular formula of the compound and using a mass spectrometer to find the molecular weight.

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Answer:

Replication is vital to science. It helps make science a self-correcting system. Any time a result is surprising, research­ers will try to replicate it, to see if the phenom­enon is dependable or just a fluke

Explanation:

The speed of the 5.30 kg body after the collision is approximately 4.358 m/s.

To solve this problem, we can apply the principle of conservation of momentum. The total momentum before the collision should be equal to the total momentum after the collision.

Let's denote the initial velocity of the 5.30 kg body as v2 and the final velocity as v2f. The initial velocity of the 1.32 kg projectile is 12.5 m/s, and its final velocity is -5 m/s (opposite direction).

Before the collision:

Total momentum = m1 * v1 + m2 * v2

= (1.32 kg) * (12.5 m/s) + (5.30 kg) * (0 m/s) (since the 5.30 kg body is stationary initially)

After the collision:

Total momentum = m1 * v1f + m2 * v2f

= (1.32 kg) * (-5 m/s) + (5.30 kg) * v2f

Since momentum is conserved, the total momentum before the collision should be equal to the total momentum after the collision:

(1.32 kg) * (12.5 m/s) + (5.30 kg) * (0 m/s) = (1.32 kg) * (-5 m/s) + (5.30 kg) * v2f

Solving for v2f:

(1.32 kg) * (12.5 m/s) = (1.32 kg) * (-5 m/s) + (5.30 kg) * v2f

16.5 kg·m/s = -6.6 kg·m/s + (5.30 kg) * v2f

23.1 kg·m/s = (5.30 kg) * v2f

Dividing both sides by 5.30 kg:

v2f = 23.1 kg·m/s / 5.30 kg

v2f ≈ 4.358 m/s

Therefore, the speed of the 5.30 kg body after the collision is approximately 4.358 m/s.

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Answer:

p2=28.12KPa

Explanation:

Given data:

Initial temperature = 295 K

Final temperature= 395 K

Initial pressure = 21.0 KPa

Final pressure = ?

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

21.0 KPa / 295 K = P₂/395 K

P₂ = 21.0 KPa× 395 K / 295 K

P₂ = 8295 KPa. K /295 K

P₂ = 28.12 KPa

Answer:

I'm pretty sure it's called Astronomy

Explanation:

Hope this helps:)...if not then sorry for wasting your time and may God bless you:)

Answer: Astronomy

Explanation: Astronomy is objects we can see with our eyes, like the Sun , the Moon , the planets, and the stars . It also includes objects we can only see with telescopes or other instruments, like faraway galaxies and tiny particles.

I hope this helps ;o o;

Physical properties of a mineral is mainly due to the atomic structure as well as the crystalline structure of the mineral. Each mineral will have its own characteristic crystalline structure.

The important physical properties are color, crystal form, hardness, cleavage, density and  specific gravity. All these properties are based on the arrangement of atoms. It atoms are tightly packed harder will be the mineral, greater the density.

The location of atoms or ions in the crystalline structure determines the cleavage. It happens through the line where the bonds are weakest.  The more the space between the atoms, less the density and specific gravity.

So all these physical properties are imparted due to the atomic structure and arrangement of atoms in its crystal.

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Answer:

- longitudinal waves only

Explanation:

The P seismic waves travel as elastic motions at the highest speeds. They are longitudinal waves that can be transmitted by both solid and liquid materials in the Earth's interior.

Explanation:

Your attitude affects your level of satisfaction with your life and with your job. Your attitude affects everyone who comes into contact with you. Your attitude is reflected in your tone of voice, posture and facial expressions. Your attitude can affect your health.