what is the wavelength of a 29.75×109hz radar signal in free space? the speed of light is 2.9979×108m/s .

Answer:

Power, P = 480 W

Explanation:

It is required to find the power used by 4 A appliance that is plugged into a 120 V circuit for 4 minutes. Power used by an appliance is given by the formula as follows :

\(P=VI\)

Plugging all the values we get :

\(P=120\times 4\\\\P=480\ W\)

So, the power used by the appliance is 480 W.

Answer:

b

Explanation:

b

Answer:

multicellular

Explanation:

all fungi are multicellular

Fungi live as either single-celled organisms or multicellular organisms. Single-celled fungi are referred to as yeasts. The vast majority of fungi are multicellular. Most of the body of a fungi is made from a network of long, thin filaments called 'hyphae

All fungi are heterotrophic, which means that they get the energy they need to live from other organisms. Like animals, fungi extract the energy stored in the bonds of organic compounds such as sugar and protein from living or dead organisms.

ANSWER:

Sphere B

STEP-BY-STEP EXPLANATION:

The time of the air depends on the mass, initial velocity and the height of the object, having the same mass and the same height, it depends only on the initial velocity.

The higher the initial velocity, the shorter the time in the air, therefore in this case the sphere B that has a lower velocity will be the one that will spend the longest time in the air.

Answer: hair

Explanation: Since a persons hair can be tracked back to their DNA this was often used because most of the criminals were female and all female have extremely long hair. Hair is also easy to find at a crime scene because the k9 dogs can easily smell it.

Answer:

The answer to this question would be fingerprints.

Explanation:

In the late 1800's Chinese organized a fingerprinting system and started using it to track down criminals

Given what we know, we can confirm that the best type of study to determine if daily reading with a parent can increase the speed at which a child learns to read independently is an experimental study.

First, one must design an experiment, in this case, it can be to allow the child to read alone for a week, then measure reading speed. Then repeat this while reading with a parent and measure the speed again. After 2 weeks, compare the results.

Therefore, with an experimental study, one can test the reading speed of the child and determine if it increases when reading with a parent.

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Answer:

Please find attached the required filled diagram created with MS Visio

Explanation:

Waves → Are produced by → Vibrating molecules → Which pass energy to → neighboring molecules

Waves → Are → Repeating disturbances → That transfers → Energy → Through → Matter or Space

Waves → that need a → Medium → are called → Mechanical → And can be either → Compressional → Or → Transverse

Answer:

Explanation:

The puck slides on the ice . Coefficient of sliding friction μ = .026

Limiting frictional force = μ R

R is reaction force of the surface .

R = mg

Friction force = μ mg

deceleration = μ mg / m

= μ g

= .026 x 9.8 = .2548

= 0.26 m /s².

When in total lunar eclipse, the moon shows a reddish color because only the red light from the Sun is deflected onto it by the Earth's atmosphere.

Hence, the correct option is B.

During a total lunar eclipse, the Earth comes between the Sun and the Moon, casting a shadow on the Moon. However, even when in the shadow, the Moon does not become completely dark. Instead, it takes on a reddish hue. This occurs due to a phenomenon called atmospheric scattering.

When sunlight passes through the Earth's atmosphere, it undergoes scattering, with shorter wavelengths (blue and green light) being scattered more than longer wavelengths (red and orange light). As the Earth's atmosphere refracts or bends the sunlight, it directs the longer red wavelengths toward the Moon.

This red light is then deflected onto the Moon's surface during a lunar eclipse, giving it a reddish appearance. Essentially, the Earth's atmosphere acts as a lens that filters out most of the other colors of light, allowing predominantly red light to reach the Moon and be observed during the eclipse.

Therefore, the correct explanation for the Moon's reddish color during a total lunar eclipse is that only the red light from the Sun is deflected onto it by the Earth's atmosphere.

Hence, the correct option is B.

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Detection methods to measure the gravitational tug of a planet on its star that is allowing us to estimate planetary mass is : (c) the astrometric and doppler methods.

Method for finding extrasolar planets and brown dwarfs from radial-velocity measurements through observation of doppler shifts in the spectrum of the planet's parent star is called doppler spectroscopy.

It is also known as the radial-velocity method or the wobble method.

Method that detects the motion of a star by making precise measurements of its position on the sky is called astrometry. This technique can be used to identify the planets around a star by measuring small changes in the position of the stars.

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As clench force increases, the amplitude of the EMG signal also increases because more motor units are recruited to generate the force required for the contraction.

EMG (Electromyography) is a technique used to measure the electrical activity of muscles. When a muscle contracts, it generates electrical activity that can be detected by placing electrodes on the skin overlying the muscle.

As clench force increases, the amplitude of the EMG signal also increases. This is because more and more motor units are recruited to generate the force required for the contraction. A motor unit consists of a motor neuron and the muscle fibers it innervates. For low-force tasks, only a few motor units are recruited, whereas for high-force tasks, many motor units are recruited.

The recruitment of motor units follows the size principle, which states that smaller motor units are recruited first followed by larger motor units as force increases. As force increases, larger motor units are recruited, resulting in an increase in the amplitude of the EMG signal.

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Calculating this, we find that the electron is moving at approximately 1.50 × 10^6 m/s.

To find the speed of the electron, we can use the formula for the centripetal force in a magnetic field. The centripetal force is given by the equation:

F = qvB

Where F is the force, q is the charge of the electron, v is its velocity, and B is the magnetic field strength.

In this case, the electron is moving in a circle, so the centripetal force is provided by the magnetic force. Therefore, we can equate the two forces:

qvB = mv²/R

Where m is the mass of the electron and R is the radius of the circle.

Given:
Charge of the electron (q) = -1.6 × 10^-19 C (Coulombs)
Magnetic field strength (B) = 3.2 × 10^-2 T (Tesla)
Radius (R) = 0.40 cm = 0.004 m (converted to meters)

The mass of an electron (m) is approximately 9.11 × 10^-31 kg.

Now we can solve for v:

qvB = mv²/R
v = (qvBR/m)^(1/2)

Plugging in the values:

v = (-1.6 × 10^-19 C * 3.2 × 10^-2 T * 0.004 m / 9.11 × 10^-31 kg)^(1/2)

Calculating this, we find that the electron is moving at approximately 1.50 × 10^6 m/s.

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        When acceleration is constant, we may connect displacement to time and velocity, two of the other three parameters that describe motion, using the following three equations: d = ( 1 2 ) ( 1 2 ) (v f + v I (t) (Equation 1) D = v I t + a t + 1 2 (Equation 2) V I 2 + 2 a d = v f 2 (Equation 3).

         Displacement is directly proportional to the square of the length of the linear motion when acceleration is constant and beginning velocity is zero.

Solution:-

vi =+245km/h

aavg = -3.0m/s2

vf =vi -(0.200)vi

vi =(245km/h)(1h/3600s)(103m/1km)= +68.1m/s

vf =(1.000-0.200)vi =(0.800)(68.1m/s)=+54.5m/s

Δt=vf -vi /aavg

 = 54.5m/s - 68.1m/s / -3.0m/s2

 =-13.6m/s /-3.0 m/s2

 =  4.5s

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Answer:

They both have the same GPH

Explanation:

GPE = mgh

m = mass of Claire

2m = mass of Jared

h = height of Claire

h/2 = height of Jared

GPE-jared = (2m)(g)(h/2) = mgh

GPE-claire = mgh

They both have the same GPH

Answer:C

Explanation:

Ghez's statement about "looking at a pebble at the bottom of a stream" refers to the difficulty of observing and studying black holes.

Ghez is referring to the fact that black holes are incredibly dense and have an intense gravitational pull that makes it difficult to observe them directly. Instead, scientists must infer their presence through the effects they have on nearby stars and other matter.

This requires extremely sensitive instruments and sophisticated techniques, much like trying to spot a pebble at the bottom of a stream. The comparison emphasizes the challenges involved in studying black holes and highlights the incredible achievements of Ghez and her colleagues in doing so.

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Explanation:

advantage: Easy to design and build the circuit

disadvantage: if one component in a series circuit fails, then all the components in the circuit fail because the circuit has been broken.

hope it helps!

Answer:

a?

Explanation:yes it is a

Answer:

4.61

60/13=4.61 so that is your answer : )

Centripetal acceleration ac is the acceleration experienced while in uniform circular motion. It always points toward the center of rotation. It is perpendicular to the linear velocity (tangential speed) v and has the magnitude:

\(a_c = \dfrac{v^2}{R}\)

Solving for v:

\(v = \sqrt{a_c R} = \sqrt{(250\;m/s^2)(0.50\;m)} = 5\sqrt{5}\;m/s \approx 11.18\;m/s\)

The yo-yo’s tangential speed 11.18 m/sec.

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

Centripetal acceleration ac is the acceleration experienced while in uniform circular motion. It always points toward the center of rotation. It is perpendicular to the linear velocity (tangential speed) v and has the magnitude:

\(a_{c} = v^2/r\)

Solving for v

\(v = \sqrt{a_{c}r }\) = 11.18 m/sec

The yo-yo’s tangential speed 11.18 m/sec.

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Answer:

1/2 m*(2(h)/t)*g

Explanation:

Kinetic energy refers to the form of energy that's used by an object due to its motion.

You didn't give more information about the values, therefore, the kinetic energy will be explained. It should be noted that when work, which helps in the transfer of energy is done on an object, the object will speed up and thereby gain kinetic energy.

Kinetic energy simply refers to the property of a moving object or a particle. It depends on both motion and mass. The formula for the calculation of kinetic energy is given as:= 1/2mv²

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The area of the shaded region is 4621.5 cm2 - 1083.8 cm2 = 3537.7 cm.

Area is the space or size of a two-dimensional surface or shape. It is a measure of the size of a surface and is typically expressed in square units, such as square feet or square meters. Area is usually calculated by multiplying the length of a shape by its width. For example, the area of a rectangle with a length of 4 feet and a width of 3 feet is 12 square feet. Area can also be calculated for shapes with curved sides such as circles, triangles, and other polygons.

The shaded region is the area between the two circles. To calculate the area of the shaded region, we need to subtract the area of the inner circle from the area of the outer circle.

The area of the outer circle can be calculated using the formula A = πr2, where r is the radius of the circle. Since the two circles have the same center, the radius of the outer circle is twice the radius of the inner circle.

Therefore, the radius of the outer circle is 2 × (117.436/2π) = 38.212 cm.

The area of the outer circle is A = π × 38.212^2 = 4621.5 cm2.

The area of the inner circle can be calculated using the same formula: A = πr2. The radius of the inner circle is (117.436/2π) = 18.606 cm.

The area of the inner circle is A = π × 18.606^2 = 1083.8 cm2.

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Answer:C

Explanation:

You should just have to do the math and will get you C

Using the free body diagram, let's determine the scenario the diagram illustrates.

From the free body diagram, we can see that the weight is acting on the object while the tension will be the force which supports the object.

The tension in this case, helps hang the object while the weight is the product of the mass of the object and the force of gravity acting on the object.

Tension can be defined as the pulling force transmitted through a rope or string.

Therefore, the best scenario which is represented by the free body diagram is a sign board supported by two strings.

ANSWER:

A signboard supported by

Centrifugal forces are an apparent reality to observers in a reference frame that is rotating.  Option d is correct.

In other words, if an observer is in a reference frame that is rotating, they will experience a force that appears to push them away from the center of rotation. This force is known as the centrifugal force. It is important to note that the centrifugal force is not a true force in the sense that it does not arise from any physical interaction. Rather, it is a fictitious force that arises due to the observer's motion in a non-inertial reference frame.

To understand this concept better, it is helpful to know that an inertial reference frame is one in which the laws of physics hold true without any need for additional forces. On the other hand, a non-inertial reference frame is one in which additional forces, such as the centrifugal force, are needed to explain the observed motion.

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The full question is:

Centrifugal forces are an apparent reality to observers in a reference frame that is

A) moving at constant velocity.

B) an inertial reference frame.

C) at rest.

D) rotating.

E) none of these

Using a saltwater aquarium to model the ocean has limitations, such as showing only a small part of the actual ocean and being unable to replicate the vastness and complexity of the ocean ecosystem.

One limitation of using a saltwater aquarium to model the ocean is that it can only show a small part of the actual ocean. Since an aquarium is confined and limited in size, it cannot realistically replicate the vastness and complexity of the ocean ecosystem. For example, it may not have the space to accommodate large marine animals like whales or the turbulent currents that exist in the open ocean. Therefore, it is important to recognize that while a saltwater aquarium can provide some insights into the ocean, it cannot fully capture the dynamic nature and diverse interactions found within the entire ocean ecosystem.

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Answer:

Actually, gravity is the weakest of the four fundamental forces. Ordered from strongest to weakest, the forces are 1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity

Explanation:

Mark me the Brainliest..pls..

Answer:

C  hit the ground at the same time

Explanation:

Both bullets have to fall the same VERTICAL distance and are affected by gravity the same way in this regard.

Answer: The speed limit is 15 mph when you come within 100 feet of a railroad crossing and you cannot see the tracks for 400 feet in both directions. You may go faster than 15 mph if the crossing is controlled by gates, a warning signal, or a flagman.

Explanation: hope this helps

Answer:69

Explanatioits funnyn: