two microwave frequencies are authorized for use in microwave ovens, 905 and 2505 mhz. calculate the wavelength (in cm) of each.

The power of the transmitter and receiver and the height of the broadcast and receiving antennas determine the Distance a radio signal will travel.

A sinusoidal voltage at 147.5 MHz is applied by the transmitter to the dipole antenna that serves as its antenna. With a matching oscillating magnetic field perpendicular to the antenna, this creates an oscillating electric field across the antenna. These travel as one electromagnetic wave, or radio wave, from the antenna.

With the oscillating magnetic field perpendicular to the antenna axis and the oscillating electric field parallel to it, this wave propagates in all directions in a plane that passes through the transmitter's antenna's center. It moves at the speed of light, and as was previously mentioned, its wavelength and oscillation frequency are connected by the formula = c/v.

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Answer:

B. Cant stop things from going wrong.

Explanation:

To me it's the only reasonable answer...

The concept law of supply shows that price and quantity supplied move in the same direction.

The law of supply relates price changes for a product to the quantity supplied. In differentiation from the law of demand, the law of supply relationship is coordinated, not converse. The higher the cost, the higher the quantity provided. Lower costs mean decreased supply, all else held equal. Higher prices donate suppliers an incentive to supply more of the item or product, expecting their costs aren't expanding as much. Lower costs result in a fetched crush that checks supply. As a result, supply inclines are upwardly inclined from cleared out to right. As with demand, supply limitations may constrain the cost flexibility of supply for a product, whereas supply shocks may cause an unbalanced cost to alter for a basic commodity.

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In just 24 hours, a "good desert" can accumulate more energy than the total energy consumption of the entire world population in a year.

Renewable energy sources like solar power have immense potential in harnessing energy from the sun. Deserts receive abundant sunlight, making them ideal for large-scale solar energy projects. Solar panels placed in deserts can capture the sun's energy and convert it into electricity.

The efficiency of solar panels has significantly improved over the years, allowing them to convert a higher percentage of sunlight into usable energy. With advancements in technology, solar power plants in deserts can generate a staggering amount of energy in a single day. This energy output surpasses the annual energy consumption of the global population, highlighting the vast potential of solar power as a sustainable energy solution.

By tapping into the sun's energy through solar installations in deserts, we can effectively meet the world's energy demands while reducing our dependence on fossil fuels and mitigating climate change.

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Answer:

588 J

Explanation:

P.E = mgh

      = 6 * 9.8 * 10

     = 588 J

if g value is rounded and taken as 10 then answer is 600 J.

From conservation of energy, the spring constant is of magnitude 367 N/m.

Hooke's law state that the extension in an elastic material is directly proportional to the force applied provided that the elastic limit is not exceeded.

Given that a mass resting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. it takes 3.1 j of work to compress the spring by 0.13 m . if the spring is compressed, and the mass is released from rest, it experiences a maximum acceleration of 12 m/s².

The given parameters are;

The elastic potential energy = work done = 3.1

1/2ke² = 3.1  

1/2 × k × 0.13² = 3.1

0.5k × 0.0169 = 3.1

0.00845k = 3.1

k = 3.1/0.00845

k = 366.86 N/m

k = 367 N/m

Therefore, the value of the spring constant is 367 N/m approximately.

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Answer:

The velocity-time graph is illustrated and it shows the speed and direction that's traveled by the bicycle.

A velocity-time graph simply shows the speed and the direction that an object travels over a particular period of time.

It should be noted that they're also known as the speed-time graph. On the vertical axis is the velocity of the object.

Since 60 minutes = 1 hour 3 minutes will be converted to hour. This will be:

= 3/60 = 1/20 hour.

5 minutes will be changed to hour. This will be: = 5/60 = 1/12 hours.

Explanation:

Answer:

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Answer:1.36078

Explanation:

Answer:

0.25 J

Explanation:

Answer:

Explanation:

1st option is the correct answer......

Answer:

Explanation:

Given mg = 4N .

m = 4 / g

At the bottom of the swing let centripetal acceleration be a

T - mg = ma

9 - 4 = ma

5 = 4 a  / g

a =  5g / 4

I am not entirely sure but I think it is:

Answer:

Explanation:The refractive index of a medium is the ratio of the speed of light in vacuum or air to the speed of light in that medium. In this case, we can calculate the refractive index of water as follows:

Refractive index of water = Speed of light in air / Speed of light in water

Refractive index of water = 3 x 10^8 m/s / 2.26 x 10^8 m/s

Refractive index of water = 1.33 (rounded to two decimal places)

Therefore, the refractive index of water is approximately 1.33.

Answer:

The Acceleration of the object = 6.4 m/s²

Explanation:

Mass of block (m) = 5 kg

Action force on block, (F₁) = 40 N

To Find:

Acceleration of the object (a) = ?

Required solution:

Frictional force opposing the motion (F₂) = 8 N

Here in this question we have to find Acceleration of the object. So, firstly we have to find Net force of block after that we will find Acceleration of the object on the basis of conditions given above

⇒ Net force = Action force on block - Opposing friction force

⇒ F = F₁ - F₂

⇒ F = 40 - 8

⇒ F = 32 N

Now, we have to two elements that used in formula, Net force and Mass of block.

Net force of the block (F) = 32 N

Mass of block (m) = 5 kg

And we have to find Acceleration of the object.

We can find Acceleration of the object by using the Second law of Newton which says F = ma

Here,

F is the Force in N.

m is the Mass in kg.

a is the Acceleration in m/s².

So let's find Acceleration (a) !

† From second law of Newton

⇛ F = ma

⇛ a = F/m

⇛ a = 32/5

⇛ a = 6.4 m/s²

Answer:

Place some smooth tiles under the dresser

Smooth surfaces, like smooth tile, are easy to slide over. They create very little friction. Rough surfaces like carpet create much more friction.

remove the drawers from the dresser

Weight affects friction in that friction is directly proportional to the weight of the load one is moving. So reduce the weight, reduce the friction.

Explanation:

Speed does not impact friction, so moving the dresser slower won't help. Wind has nothing to do with the scenario, so that's not a correct option.

Answer:

disturbance,energy

Explanation:

Waves are a disturbance that transfer energy from one place to another.

;)

Answer:

T = mg / cos θ

ac = g tan θ

Explanation:

Draw a free body diagram. There are two forces acting on the pendulum bob. A tension force T acting θ from the vertical, and gravity pulling down.

Sum the forces in the y direction:

∑F = ma

T cos θ − mg = 0

T = mg / cos θ

Sum the forces in the centripetal direction (towards the center).

∑F = ma

T sin θ = m ac

ac = T sin θ / m

Substitute for tension T:

ac = (mg / cos θ) sin θ / m

ac = (mg / m) (sin θ / cos θ)

ac = g tan θ

Answer:

https://medlineplus.gov/spanish/healthrisksofaninactivelifestyle.html

Explanation:

Cuando usted tiene un estilo de vida inactivo:

   Quema menos calorías. Esto hace que usted tenga más probabilidades de subir de peso

   Puede perder masa muscular y resistencia, porque no usa tanto sus músculos

   Los huesos se debilitan y pierden algo de su contenido mineral

   Su metabolismo puede verse afectado y su cuerpo puede tener más problemas para sintetizar grasas y azúcares

   Su sistema inmunitario quizás no funcione tan bien

   Puede tener una mala circulación de la sangre

   Su cuerpo puede tener más inflamación

   Puede desarrollar un desequilibrio hormonal

Cuando usted tiene un estilo de vida inactivo:

   Quema menos calorías. Esto hace que usted tenga más probabilidades de subir de peso

   Puede perder masa muscular y resistencia, porque no usa tanto sus músculos

   Los huesos se debilitan y pierden algo de su contenido mineral

   Su metabolismo puede verse afectado y su cuerpo puede tener más problemas para sintetizar grasas y azúcares

   Su sistema inmunitario quizás no funcione tan bien

   Puede tener una mala circulación de la sangre

   Su cuerpo puede tener más inflamación

   Puede desarrollar un desequilibrio hormonal

Answer:

All the options (a, b, c, and d) are correct situations for negative value of acceleration due to gravity.

Explanation:

Acceleration due to gravity is always acted towards the center of the earth. It's magnitude is \(9.8\rm{m/s^{2}}\).

As per the sign convention, downward direction is considered as negative.

Now, consider the cases:

1. When an object or ball is thrown upward: While moving upwards, gravity or gravitational acceleration opposes the motion of object. The object speed or displacement will be positive while gravity will be negative.

2. When an object is at the top or highest point of their path: When the object is at the top of its path, the gravity still acts downwards and the velocity becomes zero. So, gravity will be negative at this position.

3. When object is falling downward: While falling downwards, the acceleration and velocity will be negative as they both are directed downwards.

From the above points, the value of gravity will always be negative.

Therefore, in all the given options (a, b, c, and d), the acceleration will be \(-9.8\rm{m/s^{2}}\).

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0.1 km/min

Explanation:

1 km every 10 minutes

Answer:

i don’t know what kind of waves you mean but if you’re talking about sound waves...

Explanation:

“Sound waves are transmitted through solids, liquids, and gases. Light waves are transmitted through transparent materials (may be clear or colored material such as filters) that allow most of the light that strikes them to pass through them. Only a small amount of light is reflected or absorbed.”

The temperature in Celsius at which it is exactly twice the temperature in Fahrenheit is 160 °C.

The temperature can be converted from (°F) Fahrenheit to (°C) Celsius by using the formula:

°F = (9÷5) × °C + 32

To know the point where the temperature in Fahrenheit is exactly twice that in Celsius, then we can set up the equation:

2 ×°C = (9÷5) ×°C + 32

By simplifying the equation:

2 × °C - (9÷5) × °C = 32

On multiplying by 5 to cancel the fraction:

10 × °C - 9 × °C = 160

°C = 160

Hence, the temperature in Celsius at which it is exactly twice the temperature in Fahrenheit is 160 °C.

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Answer:

Explanation:'Distance' is the total length travelled by an object. The standard unit is the 'metre'.

A distance-time graph shows how far an object has travelled in a given time.

Distance is plotted on the Y-axis (left) and Time is plotted on the X-axis (bottom)

The kinetic energy of balls is conserved, the collision is elastic.

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Answer:

liver (but avoid this during pregnancy)

red meat.

beans, such as red kidney beans, edamame beans and chickpeas.

nuts.

dried fruit – such as dried apricots.

fortified breakfast cereals.

soy bean flour.

Explanation:

Answer:

A and B and D and C

Explanation:

Answer: I would say (A) (D) and (C)

Explanation: I am doing the same thing in my class as well.

Hope this helped.  :-)

Have a wonderful day!!