The current in a 90.0-mH inductor changes with time as I=1.00 t²-6.00 t , where I is in amperes and t is in seconds. Find the magnitude of the induced emf at (b) t=4.00 \mathrm{~s} .

So, the length of time for which the kettle has been switched on during the week is 5.71 hours.

Given that,

Total cost of electrical energy used by kettle in one week = 97p

Cost of 1 kWh electrical energy = 17p

To calculate the length of time for which the kettle has been switched on during the week, we can use the formula as follows;

Total cost of electrical energy = Power × Time × Cost of 1 kWh electrical energy

Let us consider Power of kettle is P.

Now,

Total cost of electrical energy used by kettle in one week = Power × Time × Cost of 1 kWh

electrical energy

97p = P × Time × 17p1kWh ⇒

Time = 97/17

time ≈ 5.71 hours

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It takes our Solar system 230 million years to complete one orbit around the milky way galaxy; option E.

The solar system refers to the system of the Sun and the planets that orbit it.

The Sun is the star of our solar system. The planets in our system include:

Our solar system is a part of the Milky Way Galaxy.

It takes about 230 million years for our Solar system to complete one orbit around the Milky Way Galaxy.

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answer :

force is called the magnetic force of repulsion, and it happens when two magnets have the same poles (either both north or both south) and they push away from each other.

When all the domains in a material are aligned in the same direction, the material becomes strongly magnetized.

explanation :

magnetic domains in the rings were stable and strong enough to resist the force of gravity.

In the case of the levitating rings, the magnetic domains were aligned in such a way that they created a strong magnetic field, which allowed the rings to levitate in mid-air.

tiny regions within ferro magnetic  material that have their own magnetic fields are called magnetic domains.

Magnetic domains in the rings refer to the tiny regions within the ring's ferro magnetic material that have their own magnetic fields.

The solenoid's axis, which is also the direction in which current flows, determines the direction of the magnetic field. As a result, Bz=0nI/2l represents the magnetic field's z component inside the solenoid.

The combined magnetic field that surrounds a closed loop and the electric current flowing through it are related in accordance with the Ampere Circuital Law. An infinitely long straight wire will produce a magnetic field that is inversely proportional to the wire's radius and directly proportional to the current.

The integral of B ⋅dl around the path is equal to the product of the magnetic field B and the circumference of the path, which is 2l. Thus,

B ⋅2l=μ0nI,

where n is the number of turns per unit length of the solenoid, and I is the current flowing through each turn. Solving for B gives

B =μ0nI/2l.

The direction of the magnetic field is along the axis of the solenoid, which is also the direction of the current flow. Thus, the z component of the magnetic field inside the solenoid is

Bz=μ0nI/2l.

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Answer:

a.ionic bond is kinds of bonds make up a formula unit of sodium chloride.

Answer:

A

Explanation:

Current is the name for the movement of electricity. Metals are often excellent conductors, allowing electricity to flow smoothly. Insulators are substances that make it difficult for electricity to pass through them.

Insulators are substances that affect the flow of electrons in exactly the opposite way from conductors. They restrict the ease with which electrons can move between atoms.  These electrons cannot be free to move and cannot be shared by nearby atoms.

There must be no energy gap between a material's valence band and conduction band for it to conduct electrical current. As a result, these bands overlap in conductors, enabling electrons to pass through.

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Answer:

15706.666

Explanation:

F = 0.155(500-(+44))/0.00450

Answer:

A saturated solution

Explanation:

A saturated solution is one that contains the most amount of solute that can be dissolved in it at a given temperature

An example of a saturated solution is carbonated water, which readily gives off bubbles of carbon dioxide gas from areas within the solution to the region above the top surface of the gas in liquid solution

A saturation solution of salt in water can be created by continuing to dissolve salt in a given amount of water until it can no longer dissolve any more salt. However, heating the saturated salt solution, increases the amount of salt that can be dissolved.

Therefore, a solution that contains all of the solute it can normally hold at a given temperature is a saturated solution

Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

Answer:

False

Explanation:

Just took the test

False, because hypochondriacs think they have a significant, undetected medical ailment even when testing reveal they are healthy.

A hypochondriac is someone who, despite diagnostic testing showing they have no health issues, lives in constant anxiety that they have a terrible, undetected medical illness. They are obsessed with the concept that they suffer from a major illness that has gone untreated.

In adults, hypochondriasis often begins to manifest. Among the symptoms are a persistent, strong anxiety of developing a major illness and concern that seemingly little symptoms portend a larger problem. A patient may change physicians or see them regularly.

Medication and counselling could be helpful.

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The torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.02 N on the ball is 0.024 N.m.

A small 1.25 kg ball on the end of a light rod is rotated in a horizontal circle of radius 1.2 m.

The moment of inertia of the system about the axis of rotation and the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.02 N on the ball can be calculated as follows:

Part (a)The moment of inertia, I of a solid ball is given by I = 2/5mr².

Here, m is the mass of the ball, and r is the radius of the ball.

We have to find the moment of inertia of the system about the axis of rotation.

Since the axis of rotation passes through the center of the ball, the moment of inertia of the ball is given by Iball = 2/5mr².

Thus, the moment of inertia of the system about the axis of rotation is given by I = Iball + mR²I = 2/5mr² + mR²I = m(2/5r² + R²)I = 1.25(2/5(0.06)² + (1.2)²)I = 0.026 kg.m²

Part (b)The torque required to keep the ball rotating at constant angular velocity can be calculated as follows:

τ = Iα

Here, τ is the torque,

I is the moment of inertia of the system, and

α is the angular acceleration.

At constant angular velocity, α = 0.

Since air resistance exerts a force of 0.02 N on the ball, the torque required to keep the ball rotating at constant angular velocity is

τ = Frτ = F × Rτ = 0.02 × 1.2τ = 0.024 N.m

Therefore, the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.02 N on the ball is 0.024 N.m.

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Answer:

The work remains the same

Please mark as brainliest

Answer:

it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

Explanation:

To find out how much heat is needed to heat 2 kg of lead from 265K to 315 K, we can use the formula for specific heat capacity, which is:

q = mcΔT

Where:

q = heat energy (in joules)

m = mass of the substance (in kilograms)

c = specific heat capacity of the substance (in joules per kilogram per degree Celsius)

ΔT = change in temperature (in degrees Celsius)

The specific heat capacity of lead is 0.128 J/g°C. we need to convert it to J/kg°C

So, the heat energy needed is:

q = (2 kg)(0.128 J/kg°C)(315 K - 265 K)

q = (2 kg)(0.128 J/kg°C)(50 K)

q = 64 J

Therefore, it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

Answer:

yes

Explanation:

velocity is vector though but speed is scalar

velocity requires direction

so velocity is literally speed with direction

Answer:

the ballon is purple

Explanation:

Answer:

B) 350 kg m/s

Explanation:

momentum or p is given by the equation p= mxv

We have the mass and velocity so we can use the equation directly

p= 72kg x 4.9 m/s

p= 352.8 kg m/s

Answer:

so basically what you gotta do is, and then you can do that but you shouldn't do this

Answer:

nun

Explanation:

Answer:

Godzilla

Explanation:

The final velocity of the airplane is 75.1 m/s.

Velocity can be defined as the measurement of rate and direction of motion.

The velocity of a moving object changes with time. Thus, a moving object will have an initial velocity as well as a final velocity.

The formula for final velocity, V is given by the formula below:

v = √(u² + 2as)

where

The values are as follows:

u = 25.88 m/s

a = 4.21 m/s²

s = 590.39 m

Substituting the values

v = √{(25.88)² + 2 * 4.21 * 590.39)}

v = 75.1 m/s

Therefore, the final velocity, v is 75.1 m/s

In conclusion, the final velocity of the airplane is derived from the initial velocity, acceleration, and distance of travel.

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Answer:

               So the distance between film and source is 26.7cm

Explanation:

GIVEN:

The divergence of the source, Ф = 50

the distance between film and source, d = 1m

To FIND:

   The spot size in cm, D = ?

SOLUTION:

                As we know the formula is give as

                              tan Ф/2 = 0.5 x D/d

Now, by putting values,

                tan 50/2 = 0.5 x D/1

               -0.134÷0.5 = D

we get

            D =0.267m

And    D=0.267x10^-2 cm

So       D= 26.7cm

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The proton experiences an acceleration of \($6.60\times10^{10} \text{m/s}^2$\) in a uniform electric field of 691 N/C, and it takes \($3.48\times10^{-5}$\) s to reach a velocity of \($2.30\times10^{6}$\) m/s. During this time, the proton travels a distance of \($4.36\times10^{-10}$\) m and has a kinetic energy of \($3.07\times10^{-12}$\) J.

(a) The magnitude of the acceleration experienced by the proton can be determined by using the equation for the force on a charged particle in an electric field, which is F = qE, where F is the force, q is the charge of the particle, and E is the electric field strength. For a proton, the charge is equal to the fundamental charge, which is \($1.602\times10^{-19} \text{C}$\). Therefore, the force on the proton is \($F = (1.602\times10^{-19} \text{C})(691 \text{N/C}) = 1.106\times10^{-16} \text{N}$\)

The acceleration of the proton can be determined using the equation F = ma, where m is the mass of the proton. Thus, \($a = F/m = \dfrac{1.106\times10^{-16} \text{N}}{1.6726\times10^{-27} \text{kg}} = 6.60\times10^{10} \text{m/s}^2$\).

(b) To find the time it takes for the proton to reach the given speed, we can use the kinematic equation v = u + at, where u is the initial velocity (which is 0 m/s), v is the final velocity (\($2.30\times10^{6} \text{m/s}$\)), a is the acceleration (\($6.60\times10^{10} \text{m/s}^2$\)), and t is the time. Rearranging this equation gives \($t = \dfrac{v-u}{a} = \dfrac{2.30\times10^{6} \text{m/s}}{6.60\times10^{10} \text{m/s}^2} = 3.48\times10^{-5} \text{s}$\).

(c) The distance the proton has moved in this time interval can be calculated using the kinematic equation \($s = ut + \dfrac{1}{2}at^2$\), where s is the distance traveled. Substituting the known values, we get \($s = \dfrac{1}{2}(6.60\times10^{10} \text{m/s}^2)(3.48\times10^{-5} \text{s})^2 = 4.36\times10^{-10} \text{m}$\)

(d) The kinetic energy of the proton can be calculated using the equation \($KE = \dfrac{1}{2}mv^2$\), where KE is the kinetic energy, m is the mass of the proton, and v is the velocity of the proton. Substituting the known values, we get \($KE = \dfrac{1}{2}(1.6726\times10^{-27} \text{kg})(2.30\times10^{6} \text{m/s})^2 = 3.07\times10^{-12} \text{J}$\).

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Answer:

jus did this, the answer is A, -0.8 m/s^2 :)

Explanation:

Answer:

Explanation:

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

force = mass × acceleration

From the question we have

force = 10 × 16

We have the final answer as

Hope this helps you

The moon's gravity  pulls back on the earth. (B)

The two pulls are EQUAL.

Gravity always produces a pair (2) of equal forces in opposite directions.  For example, your weight on the Earth is equal to the Earth's weight on you !

All large telescopes are reflectors since they offer these benefits and are better suited for large telescopes.

Specifically: It is feasible to manufacture telescopes with wider apertures (larger diameter mirrors), which can collect more light and provide higher resolution images, because mirrors can be produced larger than lenses without sagging under their own weight.

Thin metal sheets can be applied to mirrors to improve reflectivity and decrease light loss.

Mirrors can be supported from the back, which increases their rigidity and solves the lens flexure issues that plague refracting telescopes.

Although producing huge lenses to exact specs is more expensive and complex than producing large mirrors, reflectors are typically less expensive to produce than refractors.

Hence, all large telescopes are reflectors since they offer these benefits and are better suited for large telescopes.

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The required volume of the gas is 0.52 L.

Diminishing the volume of a contained gas will expand its tension, and expanding its volume will diminish its strain. As a matter of fact, on the off chance that the volume increments by a specific variable, the tension declines by a similar element, as well as the other way around.

V1 = 1.56 L, P1 = 1 atm, P2 = 3 atm,

To find: V2 of gas

So, P1V1 = P2V2

V2 = P1V1/P2

V2 = 1.56(1)/3 = 0.52 L

Thus, required volume of gas is 0.52L

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Correct question:

A gas occupies 1.56 l at 1.00 ATM what will be the volume of this gas if the pressure becomes 3.00 ATM

The frequency of the spinning flat disc can be calculated by taking the reciprocal of its period. In this case, since the period is 2 seconds, the frequency of the disc is 0.5 Hz.

Frequency is a measure of how many cycles or oscillations occur in a given time period. It is defined as the reciprocal of the period, which is the time taken to complete one cycle.

In this case, the period of the spinning flat disc is given as 2 seconds. To find the frequency, we can take the reciprocal of the period, which means dividing 1 by the period.

Therefore, the frequency (f) of the disc can be calculated as:

f = 1 / T

Where T is the period of the disc.

Substituting the given period of 2 seconds into the formula, we have:

f = 1 / 2

Simplifying the expression, we find:

f = 0.5 Hz

Hence, the frequency of the spinning flat disc is 0.5 Hz, indicating that it completes 0.5 cycles or oscillations per second.

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the energy of ultraviolet radiation that has a wavelength is 6.95*\(10^{-19}\) kj/photon

calculation :

1.E =hc/λ

λ = hc/E

 = \(\frac{6.6626*10^{-34}*3*10^{8} }{1.99*10^{-19} }\)

 = \(1.0*10^{-8}m\)

2 . E =hc/λ

    λ = hc/E

       =  \(\frac{6.6626*10^{-34}*3*10^{8} }{3.97*10^{-19} }\)

      = 501 nm

3 . λ = 286 nm

     E =hc/λ

        =   \(\frac{6.6626*10^{-34}*3*10^{8} }{286}\)

        =  6.95*\(10^{-19}\) kj/photon

In physics, energy is the quantitative property transmitted to the body or physical system, perceived in the performance of work and in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. The unit of measure for energy in the International System of Units (SI) is the joule (J).

Common forms of energy include the kinetic energy of moving bodies, the potential energy stored in bodies (due to their position in the field, etc.), the elastic energy stored in fixed bodies, the chemical energy associated with chemical reactions, Radiant energy carried by electromagnetic radiation and internal energy contained in thermodynamic systems. All living things absorb and emit energy all the time.

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