the peak wavelength of the emission spectrum of a star is 320 nm. which one of the following is the only possible correct statement?

The bearing stress in this scenario is 2 kN/mm². To calculate the bearing stress, we need to use the formula:
Bearing Stress = Load / Contact Area

Substituting the given values:
Bearing Stress = 10 kn / 5 square mm
Bearing Stress = 2 N/mm^2

It is important to note that bearing stress is a measure of the force per unit area exerted on the contact surface between two components. In this case, the load is distributed over an area of 5 square mm, resulting in a bearing stress of 2 N/mm^2. It is important to ensure that the bearing stress is within the allowable limits to prevent failure or damage to the components.

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Answer:

ans: Electromagnetic

Answer:

B on edg.

Explanation:

The electric field is the least in magnitude at point A due to the cancellation of the electric field vectors produced by the two positive charges. The correct option is A.

The electric field at a point due to two-point charges can be found by the principle of superposition, which states that the net electric field at a point due to multiple point charges is the vector sum of the electric fields at that point due to each individual charge.

For the given configuration, the electric field will be the least in magnitude at point A. At this point, the two charges are equidistant from point A and are both positive. The electric field vectors at points between the two charges point in opposite directions, and at point A, they have equal magnitudes but opposite directions, resulting in their cancellation and producing a net electric field of zero.

Option (B) is not true because the electric field is not necessarily smaller at point B compared to other points.

Option (C) is not true because the electric field is not necessarily smaller at point C compared to other points.

Option (D) is not true because the electric field is not necessarily smaller at point D compared to other points.

Option (E) is not true because the electric field is not necessarily smaller at point E compared to other points.

Therefore, the correct answer is (A) A.

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Simply multiplying the appliance's wattage by the number of hours it is used each day will accomplish this.

You must divide this figure by 1,000 since you require kilowatt- hours and this gives you watt-hours (a kilowatt equals 1,000 watts). The Energy Information Agency (EIA) estimates that the typical American home uses 10,715 kilowatt-hours (kWh) of energy annually. It takes 29,360 watts (W) per day to power a home for a day, which can be divided by 24 to get an average of 1,223 W. According to data from industry watchdog Ofgem from January 2022, the typical dual fuel variable tariff cost £1,277 per year, or £106.41 per month.

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The person who first proposed that electrons exhibit the properties of a wave was French physicist Louis de Broglie in 1924. De Broglie introduced the concept of wave-particle duality, suggesting that particles, such as electrons, could also have wave-like properties.

We have heard about the nature of light and the characters it displays. Interference, reflection, refraction and diffraction are some of the characteristics. Wave-Particle Duality helps us to understand the particle and wave nature of light. Based on the idea that light and all other electromagnetic radiation may be considered a particle or a wave nature, in 1923 physicists Louis De Broglie suggested that the same kind of duality must apply to the matter.

So, The person who first proposed that electrons exhibit the properties of a wave was French physicist Louis de Broglie in 1924.

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According to Newton's Second Law of Motion, if there is acceleration, there must be a net force acting on an object. This means that there must be an unbalanced force or a combination of forces that is causing the object to change its motion.

The magnitude and direction of the net force determine the rate of acceleration of the object. So, acceleration cannot occur without the presence of a net force.

To explain the relationship between acceleration and net force, we need to understand Newton's second law of motion.

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, it can be represented as:

Acceleration (a) = Net Force (F) / Mass (m)

If there is acceleration, it means that there must be a net force acting on the object. This is because, according to the formula, when net force (F) is zero, the acceleration (a) will also be zero. Therefore, for an object to accelerate, there must be a non-zero net force acting on it.

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Answer:

40joules

Explanation:

Work done = force × distance

Therefore 5×8=40

Work done is 40 joules

1 meter = 39.37 inches

Then the meter stick is 39.37 inches long.

The average emf induced in the coil is 7.5 V.

To calculate the average emf induced in the coil, we can use Faraday's law of electromagnetic induction, which states that the emf induced in a coil is equal to the rate of change of magnetic flux through the coil. The magnetic flux (Φ) can be calculated by multiplying the magnetic field strength (B) by the area of the coil (A) and the number of turns (N).

Φ = B * A * N

In this case, the magnetic field strength is given as 0.75 T, the area of the coil is 10 m², and the number of turns is 50. Therefore, the magnetic flux is:

Φ = 0.75 T * 10 m² * 50 turns

Φ = 375 T·m²

Since the coil is flipped over in 0.20 s, we can calculate the average emf (ε) using the formula:

ε = ΔΦ / Δt

where ΔΦ is the change in magnetic flux and Δt is the change in time.

ΔΦ = 375 T·m² - (-375 T·m²) = 750 T·m²

Δt = 0.20 s

ε = 750 T·m² / 0.20 s

ε = 3750 V / 0.20 s

ε = 18750 V/s

Therefore, the average emf induced in the coil is 18750 V/s, which is equivalent to 7.5 V.

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Answer: 5.44 m/s

Explanation:

Given:

Mass of cart: 160 kg

Momentum of cart: 870 kg•m/s

\($$Momentum $|\rho|=m \times v$$$\begin{aligned}&870 \ kg\cdot m/s=160 \mathrm{~kg} \times v \\&v=5.44 \mathrm{~m} / \mathrm{s}\end{aligned}$$\)

Answer:

The momentum is defined as :

P=mv

Where m is the mass and v is the velocity. In this case we know the mass is 160 kg and the momentum is 870 kg plugging in this equation above and solving for the velocity we have

870=160V

V=870÷160

V=5.44

Therefore, the velocity of the cart is 5.44 m/s.

Given that the progressive wave equation is represented by y=Asin2π(0.15t-0.1x). Let's find the period, amplitude, frequency, wavelength, and velocity.

The wave equation is represented by y=Asin2π(0.15t-0.1x). The standard wave equation can be written asy = Asin(kx-ωt + Φ)Where,k = wave numberω = angular frequencyΦ = phase angle for the given equation, k = 0.1 and ω = 0.15.Amplitude:

Amplitude = A = maximum displacement from the mean position.A = 1Frequency: Frequency is the number of complete oscillations made by a point on the wave in one second. It is denoted by f.f = ω/2πFrequency, f = 0.15/2π = 0.0238 HzPeriod: Period is the time taken by one complete oscillation.

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Answer:

The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element, it becomes too hot and glows red. But the resistance of cord which is usually of copper or aluminum is very low so it does not glow.

Answer:

a) 588.235 ohm ( all the 3 resistors are in parallel )

b) 10 A

c) Current flowing -

in 20 ohm resistor = 6.25 A

in 100 ohm resistor = 1.25 A

in 50 ohm resistor = 2.5 A

d) Voltage drop across all the resistor = 125 V

(As all the resistors are in parallel all the resistors will have the same voltage drop )

e) Power dissipated -

in 20 ohm resistor = 781.25 W

in 100 ohm resistor = 156.25 W

in 50 ohm resistor = 312.5 W

(Power = Current × Potential Difference)

Answer:

market is defined as the sum total of all the buyers and sellers in the area or region under consideration. The area may be the earth, or countries, regions, states, or cities. The value, cost and price of items traded are as per forces of supply and demand in a market.

Answer:

A market is defined as the sum total of all the buyers and sellers in the area or region under consideration.

Explanation:

Answer:

This is because we are surrounded by positive ions from electromagnetic fields generated by computers, cell phones, and other electronic devices which can impair brain function and suppress the immune system causing symptoms such as: anxiety, breathing difficulty, fatigue, headaches, irritability, lack of energy, poor concentration, nausea, and vertigo,

Explanation:

Answer:

Ions can be harmful because ions can produce dangerous indoor ozone and  can waste space and electricity. Hours of negative ion exposure can produce symptoms of depression. On the other hand, ions can help improve our immune systems by strengthening our immune cells. Ions can also speed up the production of antibiotics.

The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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Answer:

the foiley like color doesn't absorb the heat it bounces off of it. it would be much better to have a black blanket

Answer:

Equivalent resistance, \(\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+....\)

Explanation:

The parallel combination of resistors is given by :

\(\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+....\)

In the parallel combination of resistors, the current through each resistor is the same while the potential divides. On the series combination of resistors, the potential divides while the current hrough the current is the same.

Answer:

\(\boxed {\boxed {\sf 20 \textdegree C}}\)

Explanation:

We are asked to find the initial temperature of aluminum. We will use the following formula.

\(q= mc \Delta T\)

Where q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature, which is also the difference between the final and initial temperature.

\(q= mc (T_f-T_i)\)

We know the heat energy applied is 4050 Joules, the mass is 150 grams, the final temperature is 50 degrees Celsius and the specific heat is 900 Joules per kilogram degree Celsius.

We must convert the mass to kilograms because the specific heat is in kilograms. 1 kilogram contains 1000 grams.

Substitute all the known values into the formula.

\(4050 \ J = (0.150 \ kg )(900 \ J/kg \textdegree C)(50 \textdegree C -T_i)\)

We are solving for the initial temperature, so we must isolate the variable \(T_i\)It is being multiplied by 0.150 kilograms and 900 Joules per kilogram degree Celsius. The inverse operation of multiplication is division, so we divide by both values.

\(\frac {4050 \ J}{ (0.150 \ kg )(900 \ J/kg \textdegree C)}= \frac{(0.150 \ kg )(900 \ J/kg \textdegree C)(50 \textdegree C -T_i)}{(0.150 \ kg )(900 \ J/kg \textdegree C)}\)

\(\frac {4050 \ J}{ (0.150 \ kg )(900 \ J/kg \textdegree C)}=(50 \textdegree C -T_i)}\)

The units of Joules and kilograms cancel.

\(\frac {4050 }{ (0.150 )(900 \ \textdegree C)}=(50 \textdegree C -T_i)}\)

\(\frac {4050}{135} \textdegree C = (50 \textdegree C -T_i)\)

\(30 \textdegree C = (50 \textdegree C -T_i)\)

50 degrees Celsius is being added to \(-T_i\). The inverse operation of addition is subtraction. Subtract 50 degrees Celsius from both sides.

\(30 \textdegree C - 50 \textdegree C= 50 \textdegree C - 50 \textdegree C - T_i\)

\(-20 \textdegree C = -Ti\)

\(T_i\) is being multiplied by -1. The inverse operation of multiplication is division. Divide both sides by -1.

\(\frac {-20 \textdegree C}{-1}= \frac{-T_i}{-1}\)

\(20 \textdegree C = T_i\)

The initial temperature of the aluminum was 20 degrees Celsius.

The use of a parachute when jumping out of a plane is beneficial because it reduces the impulse and momentum of the jumper, leading to a safer landing with a reduced risk of injury.

The use of a parachute when jumping out of a plane is beneficial because it reduces the impulse and thus the momentum of the person jumping. Momentum is defined as the product of an object's mass and velocity, and it is conserved if there are no external forces acting on the object.

When jumping out of a plane, the initial momentum of the person is determined by their mass and the velocity they have just before jumping. If they were to fall to the ground simply, the momentum would remain constant and the velocity would increase as they fall, leading to a much greater impact force upon landing.

Thus, the use of a parachute when jumping out of a plane is beneficial because it reduces the impulse and momentum of the jumper, leading to a safer landing with a reduced risk of injury.

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(a) The block will move approximately 0.352 meters up the plane before coming to rest.

(b) No, the block will not slide down the plane again after coming to rest.

(a) To determine how far the block will move up the plane before coming to rest, we need to consider the conservation of energy. The initial kinetic energy of the block is converted into potential energy as it moves up the plane. At the point where the block comes to rest, all of its initial kinetic energy will be converted into potential energy.

The gravitational potential energy (PE) is given by PE = m * g * h

Since the block is moving with a constant velocity down the inclined plane, there is no net force acting on it, which means the gravitational force is balanced by the component of the force due to the incline. This can be expressed as m * g * sin(θ) = m * g * h.

Simplifying the equation, we find sin(θ) = h.

Given that the slope angle θ = 20.4 degrees, we can substitute this value into the equation to find h:

sin(20.4 degrees) = h.

Calculating sin(20.4 degrees), we get:

h ≈ 0.352 meters.

Therefore, the block will move approximately 0.352 meters up the plane before coming to rest.

(b) After the block comes to rest, it will not slide down the plane again. When the block reaches its maximum height, its velocity becomes zero. Since there is no additional force acting on the block, it will remain at rest in that position. The gravitational force acting on the block is now directed vertically downwards, perpendicular to the plane. Without any additional force or inclination to overcome the gravitational force, the block will not slide down the plane again.

(a) The block will move approximately 0.352 meters up the plane before coming to rest.

(b) No, the block will not slide down the plane again after coming to rest because there are no additional forces acting on it to overcome the gravitational force pulling it downward perpendicular to the plane.

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The tank will contain 350 lb of salt when it is full of brine.

Let x be the amount of salt in the tank when it is full.

Then:

x = 50 + 1 * (400 - 100) = 50 + 300 = 350 lb

So, the tank will contain 350 lb of salt when it is full of brine.

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When the bus driver steps on the brakes, your motion on the bus will experience a sudden deceleration. Your body tends to keep moving forward due to inertia, causing you to lurch forward.

This situation applies to Newton's First Law of Motion.

Newton's First Law of Motion: An object at rest or in motion will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

According to Newton's First Law of Motion, an object will continue its current state of motion (either at rest or moving with a constant velocity) unless acted upon by an external force. In this case, the external force is the bus driver applying the brakes, which causes the bus to decelerate. Due to your inertia, your body wants to maintain its state of motion, resulting in you lurching forward inside the bus.

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Answer:B. 40.6%

Explanation:

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 50 × 3 = 150

We have the final answer as

Hope this helps you

Answer:

100 meters

Explanation: