An EM wave in free space has a wavelength of 720 nm .
What is its frequency?
Express your answer to two significant figures and include the appropriate units

Newton's third rule of motion states that whenever air is forced backwards out of a balloon (out the end with the opening), there must be an equal and opposite reaction force pushing the balloon forward (out the end opposite the opening).

A balloon tends to fly around the room randomly when you just let it go on its own, making steering nearly impossible. On the other hand, you can use the balloon's energy to move the automobile forward if you attach it to a vehicle.

What is the ballon powered car model experiment?

Steps to Take

1. Poke a hole through the centre of the pop bottle lid with the hammer and nail.

2. Attach the ballon to the straw using masking tape. By blowing into the straw, check the balloon for any holes.

3. Connect the tongue depressor to the two short straw pieces. These will serve as the wheels' axles.

4. Using the skewers, fasten the four wheels. This could be a little difficult! To prevent the bottle cap from rubbing on the side of the tongue depressor, you might need to adjust it.

5. Use masking tape to secure the balloon and straw to the car's top.In order to have enough space to blow into the straw, make sure it is over the edge.

6. Blow into the balloon, grip the straw, then release. Observe how the automobile moves off! ​

Students build a car in this exercise that is propelled by the elastic energy of a balloon. In contrast to family automobile, which transforms chemical energy into kinetic energy, this vehicle transforms potential energy into kinetic energy.

When inflated with air, balloons, which are elastic, can store potential energy. The potential energy, sometimes referred to as kinetic energy, is transformed into the energy of motion when the air is released. When the car is moving forward, you can perceive this energy.

When you release the automobile, it will have more kinetic energy the more potential energy it has saved.

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Answer:

They increase the time it takes to slow you down, which decreases the force applied to you.

Explanation:

Hope it helps :)))

Answer:

They increase the time it takes to slow you down, which decreases the force applied to you.

Explanation:

Air bags can only deploy at around 8-14mph

Answer:

Lithium

Explanation:

Elements that are metals are tend to lose electrons and become positively charged ions called Cations. Elements that are non metals tend to gain electron and become negatively charged ions called Anions.

Answer: True

The distanve travelled is d=1200 miles

Time taken is t=420 miles.

The velocity is

The velocity is 2.85 miles/min

Answer:

The average speed of an object is the total distance traveled by the object divided by the elapsed time to cover that distance.

Answer:

The total distance traveled by the object divided by the elapsed time to cover that distance is known as the average speed.

Answer:

Speed

Explanation:

The answer is speed. It doesn’t affect potential energy because it’s associated with position. But since kinetic energy is associated with motion speed affects it.

Answer:

its 882 J

Explanation:

the answer is D for edge

The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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Answer:

397 j

Explanation:

Because 5.0kg yuh

The kinetic energy of the block with a mass of 5.0 kg is pushed on a frictionless surface by applying a horizontal force of 80.0 N. The block starts from rest, and its final velocity is 12.6 m/s is 396.9 J.

A moving item or particle has a certain kind of power called kinetic energy. When an item exerts a net force to perform work, which involves the transfer of energy, the object accelerates and as a result, gains kinetic energy.

The amount of kinetic energy that a moving object or particle possesses is determined by both its mass and rate of motion. Any combination of vibration, axis rotation, translation (or movement along a path from one location to another), and translation are all possible motion types.

Given:

The mass of the block, m = 5 kg,

The horizontal force, F = 80 N,

The velocity of the block, v = 12.6 m / s,

Calculate the kinetic energy by the formula given below,

\(KE = 1/2mv^2\)

KE = 1 / 2 × 5 × 12.6²

KE =  1 / 2 × 5 × 158.6

KE = 396.9 J

Therefore, the kinetic energy of the block with a mass of 5.0 kg is pushed on a frictionless surface by applying a horizontal force of 80.0 N. The block starts from rest, and its final velocity is 12.6 m/s is 396.9 J.

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The complete question is A block with a mass of 5.0 kg is pushed on a frictionless surface by applying a horizontal force of 80.0 N. The block starts from rest, and its final velocity is 12.6 m/s. ​Find its kinetic energy?

Answer:

Directional hypothesis is an example of a directional research hypothesis.

Explanation:

Directional hypothesis: A directional (or one tailed hypothesis) states which way you think the results are going to go, for example in an experimental study we might say…”Participants who have been deprived of sleep for 24 hours will have more cold symptoms in the following week after exposure to a virus than

All materials that enter or leave the cell must pass across the cell membrane. The cell membrane is a selectively permeable barrier that regulates the movement of substances in and out of the cell.

The cell membrane consists of a phospholipid bilayer embedded with various proteins and other molecules. It controls the passage of molecules and ions by different mechanisms:

Passive Diffusion: Small, non-polar molecules such as oxygen and carbon dioxide can passively diffuse across the cell membrane. This occurs due to the concentration gradient, where substances move from an area of higher concentration to an area of lower concentration.

Facilitated Diffusion: Larger or charged molecules, such as glucose or ions, require the assistance of specific membrane proteins called transporters or channels to move across the cell membrane. Facilitated diffusion also occurs along the concentration gradient but relies on protein-mediated transport.

Active Transport: Some molecules need to move against the concentration gradient, from an area of lower concentration to an area of higher concentration. Active transport involves the use of energy (ATP) and specific carrier proteins to pump molecules across the membrane, allowing the cell to accumulate substances or maintain concentration gradients.

Endocytosis and Exocytosis: Large molecules, such as proteins or cellular waste, can be transported across the cell membrane through processes called endocytosis and exocytosis. Endocytosis involves the cell engulfing substances by forming vesicles from the cell membrane, while exocytosis releases substances by fusing vesicles with the cell membrane.

Overall, the cell membrane plays a crucial role in maintaining the internal environment of the cell by selectively allowing the passage of specific molecules while preventing the entry or exit of others. This regulation ensures proper functioning and survival of the cell.

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Answer:

The velocity is \(u = 19.1 \ m/s\)  

Explanation:

From the question we are told that

  The time taken by the ball is  t =  2.5 seconds

  The angle made with the horizontal is \(\theta = 40^o\)

Generally the vertical component of the initial velocity is mathematically represented as

         \(u_y = u sin (\theta )\)

Generally at maximum height of the ball the velocity is  v  =  0 m/s and  the time take to reach this maximum height is

    =>         \(t_m = \frac{t}{2} = \frac{2.5}{2} = 1.245 \ s\)  [This because t is duration for the to a fro travel of the ball]

Generally from kinematic equation

        \(v = u_y + gt\)

Here  \(g = -9.8 m/s^2\) given that the direction is against gravity

=>     \(0 = u sin (40) - 9.8 * [1.25]\)

=>     \(0 = 0.6428u - 12.25\)  

=>     \(u = 19.1 \ m/s\)  

Acceleration of the car is 6 m / s ².

a =  ( v - u ) / t

a stands for acceleration

u stands for initial velocity

v stands for final velocity

Given ,

u = 5 m / s

v = 20 m / s

t = 2.5 s

a =  ( v - u ) / t

a = ( 20 - 5 ) / 2.5

  =  15 / 2.5

 a  = 6 m / s ²

Hence , Acceleration of car is 6 m / s ² .

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The given question is incomplete kindly refer below for complete question :

A car accelerates from 5m/s to 20m/s in 2.5 seconds . Find the acceleration of the car .

Addition of vectors is done by adding the components of the vectors

The total speed of the fan  is approximately 9.43 m/s,

Direction of total wind 58° counterclockwise from the positive x-axis

The reason the value is correct is as follows:

The given parameters are:

The direction at which the fan blowing at 5 m/s is blowing = Easterly

The direction in which the fan blowing 8 m/s is blowing = Northerly

The total speed of the van, |v| ≈ 9.43 m/s

Required:

To find the total wind speed of the fans

Solution:

Taken the easterly direction as the ith component, and the northerly direction as the jth component,  the vector representing the speed of the fan is presented as follows

v = 5·i + 8·j

The magnitude of the total wind speed of the fan, |v| = √(5² + 8²) = √(89) ≈ 9.43

The total wind speed of the fan , |v| ≈ 9.43 m/s

The direction of the total speed with respect to the x-axis, θ, is given as follows;

θ = arctan(8/5) ≈ 58°

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A uranium atom's nucleus measures 1.5 x 10^-14 mm in diameter and weighs of 2.2635 x 10^17 kg.

The Earth's crust contains 2.8 parts per million of uranium, an element that is found naturally. It is virtually always present in little amounts. It is almost the same in abundance as tin, somewhat less abundant than cobalt, lead, or molybdenum, and more abundant than gold, silver, or mercury.

Nucleus density is determined by the ratio of mass to volume.

Proton mass equals nucleus mass.

Nucleus volume is equal to (4/3)*pi*r3. and r is the radius

A uranium atom's nucleus has a mass of 4.0*10^-25 kg and a diameter of 1.5*10^-14 m.

first, locate volume.

Radius is calculated as follows: 1.5*10^-14 m/2 = 7.5*10^-15 m radius

vol is equal to (4/3)*pi*(7.5*10^-15)3 = 1.76715*10^-42 of volume.

Locate density using the formula d=m/vol (kg/m³)

d = 4.0*10^-25 kg / 1.76715*10^-42 m^3

d = 2.2635*10^17 (kg/m³)

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Correct Question:

The Nucleus Of A Uranium Atom Has A Diameter Of 1.5*10^-14 M And A Mass Of 4.0*10^-25 Kg.

In this experiment, time represents the variable that is independent and graphed on the horizontal axis.

The period of the pendulum does not depend on the mass of the sphere, only on the length of the chord. Two pendulums with different masses but the same length have the same period. Two pendulums of different lengths have different periods with the pendulum with the longer string having a longer period.

For small deflections of less than 15 degrees, the pendulum experiences simple harmonic oscillations. This means that its restoring force is directly proportional to its deflection. A simple pendulum is called a simple pendulum. The longer the pendulum is, the longer it will take to travel the distance it swings from side to side. The period of a pendulum is the time it takes for the weight to swing and return to its original position so it means a longer period.

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Answer:

she can answer : which part of the magnet is said strongest at attracting iron & how fast does iron lose its magnetism?

Answer: A.9.2m/s

Explanation:

The minimum work needed to push a 850 kg car 840 m up along a 8.0 ∘ incline, ignoring friction, is 696,460 J.

We can use the formula W = Fd cosθ, where W is the work done, F is the force applied, d is the displacement, and θ is the angle between the force and the displacement. In this case, the force required to move the car up the incline is equal to its weight, which is given by F = mg, where m is the mass of the car and g is the acceleration due to gravity. Plugging in the values, we get F = (850 kg)(9.81 m/s^2) = 8,258.5 N.

The displacement is given by d = 840 m, and the angle θ is 8.0 ∘. To find the cosine of the angle, we convert it to radians by multiplying by π/180, giving cosθ = cos(8.0 ∘ × π/180) = 0.9925. Plugging in the values to the formula, we get W = (8,258.5 N)(840 m)(0.9925) = 696,460 J.

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The branch of astronomy that deals with the origin and evolution of the universe is called "cosmology." Cosmology is a field of study that seeks to understand the large-scale structure, composition, and dynamics of the universe as a whole.

Cosmologists investigate the fundamental questions about the universe, such as its age, how it began, its overall structure, and its ultimate fate. They explore the distribution of galaxies, the formation and evolution of structures like galaxy clusters and superclusters, the cosmic microwave background radiation, dark matter, and dark energy. The tools and techniques used in cosmology include observations from telescopes, space probes, and satellites, as well as theoretical models and computational simulations.

Scientists analyze data from cosmic microwave background radiation surveys, galaxy surveys, and other astronomical observations to test and refine our understanding of the universe's origin and evolution. Cosmology draws from various fields of physics, including general relativity, particle physics, and quantum mechanics, to develop theories and models that explain the observations and provide a comprehensive understanding of the universe on its largest scales.

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Answer:

See below

Explanation:

A ) distance = 1/2 a t^2    <==== when starting from rest

          20    = 1/2 (a) (3.5^2)      shows a = 3.27 m/s^2

B)   Velocity(at 3.5 s)   =   a t   = 3.27 * 3.5 = 11.42 m/s

C)    3.5 seconds      +    80 m / 11.42 m/s = 10.5 s

Answer:

Below

Explanation:

F = m * a

8.2 N = 11.5 kg  * a

a = .71 m/s^2

Answer:

Answer:

I think it is C

Explanation:

If the temperature of a gas increases, the gas particles have a higher average speed as they gain kinetic energy. They collide more frequently with the walls of the container, which produces a bigger pressure.

The term which is considered as being undefined is referred to as a point and is therefore denoted as option A in this context.

This is defined as as small round mark written on a plane which signifies the position or location of a substance. This can also be seen as a dot and is also used to separate a group of numbers such as in the case of decimals etc.

It is referred to as being undefined alongside a plane, line etc as a result of it only being explained using specific examples and descriptions unlike a segment which can be viewed and understood easily when working on the parameter.

This is therefore the reason why a point is undefined and the most appropriate choice.

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The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

It is very hard when pulling  water and if a person need to consistently pull air out of the tube before water makes it to the pump, it is very  difficult and some pumps may or cannot do it.

In regards to pushing, when a person is pushing above the Center of Gravity, one is pushing the said object into the ground and thus is increasing the rate of friction.

If a person is pulling you are said to be pulling above the Center of Gravity and lowering friction.

So, The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

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