Please I need help on this one

Answer:

i would think the first two, but i cant be sure.

Explanation:

The answer would be A because sound waves and electomagnetic waves carry energy and they can both refract.

Answer: A. Both waves carry energy and refract.

Explanation: Rarefaction is where vibrating particles are spread apart.

Vo = 30 m/s Vf = 26 m/s, t = 20ms = 0.02s

A = Vo + Vf / t

A = 30 + 26 / 0.02

A = 56 /0.02

A = 2800 m/s^2

The  average acceleration of the racket is 2,800 m/s²

The given parameters include;

initial speed of the racket, u = 30 m/s

recoil velocity of the racket, v = 26 m/s

time of collision, t = 20 m/s

To find:

Let the backward or recoil velocity be in negative direction

The average acceleration of the racket is calculated as;

[tex]average \ acceleration \ =\frac{\Delta \ velocity}{\Delta \ time} = \frac{v - u}{t} \\\\average \ acceleration \ = \frac{-26 - 30}{20 \times 10^{-3}}= \frac{-56}{20 \times 10^{-3}} = -2,8 00\ m/s^2\\\\magnitude \ of \ average \ acceleration = 2,800 \ m/s^2[/tex]

Thus, the  average acceleration of the racket is 2,800 m/s²

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Answer:

B. An engine does 100 joules of work in 2 seconds.

Explanation: I hope u get it right.

Answer: A king

Explanation: A king has a everything  he needs to live as long as he lives

Answer: your answer is B

Explanation: Seismic waves causes potential energy that accumulates in a fault to transfer to the surface during an earthquake.

Answer: Seismic waves

Answer:

[tex]1.16\cdot 10^{-7} N[/tex]

Explanation:

The force of gravity between two objects is given by:

[tex]F=G\frac{m_1 m_2}{r^2}[/tex]

where

G is the gravitational constant

m1, m2 are the masses of the two objects

r is their separation

In this problem, we have

m1 = m2 = 1170 kg is the mass of each car

r = 28 m is their separation

Substituting,

[tex]F=(6.67\cdot 10^{-11} )\frac{(1170 kg)^2}{(28 m)^2}=1.16\cdot 10^{-7} N[/tex]

Force is the product of mass and acceleration. The Force between the two-car is 1.1646 x 10⁻⁷ N.

Force can be defined as an influence that can change the motion of an object. It can be given by the formula,

F = m x a

Given to us

Masses of the car, m = 1170 kg

Distance between the car, d = 28 m

We know that according to the force of gravity,

[tex]F = G\dfrac{m_1m_2}{d^2}[/tex]

G = gravitational constant (6.67 × 10⁻¹¹ N·m²/kg²),

m₁ = mass of object 1

m₂ = the mass of object 2

d = distance between two objects

Substitute the values,

[tex]F = (6.67 \times 10^{-11})\dfrac{1170 \times 1170}{28^2}\\\\F = 1.1646 \times 10^{-7}\ N[/tex]

Hence, the Force between the two-car is 1.1646 x 10⁻⁷ N.

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Seawalls, groins, jetties and other shoreline stabilization structures have had tremendous impacts on our nation's beaches. Shoreline structures are built to alter the effects of ocean waves, currents and sand movement. They are usually built to "protect" buildings that were built on a beach that is losing sand.

Answer:

Seawalls are made for coastal defense purposes

Explanation:

Seawalls are massive structures which are designed  to prevent coastal erosion and other damages due to wave action during huge storms such as hurricanes.

My family used to live near one. It are very satisfying to watch during rain storms, because you can hear the sound of the rain falling on top of it. I also loved watching the waves hit the sea wall then roll back down.

Hope this helps. ( Sorry I go a little carried off)

Answer:

B. The stone will feel warmer than the glass after twenty minutes.

Explanation:

The stone will feel warmer than the glass because the stone absorbs the heat faster than the glass would, anyway the glass would reflect the light away from it.

The correct answer is option b. The prediction which is supported by Carla's experimental result is The stone will feel warmer than the glass after twenty minutes.

Carla's experiment involves placing a piece of smooth, clear glass and a piece of smooth, black stone under a lamp for twenty minutes. The key factors here are the different properties of glass and black stone, particularly their absorption and reflection of light and heat.

Here’s a breakdown of the properties:

- Clear glass: Generally, clear glass allows light to pass through it (transmission) and does not absorb much heat.

- Black stone: Black surfaces tend to absorb most of the light that hits them, converting it into heat.

Given these properties, the prediction that is most likely to be supported by Carla’s experimental results is The stone will feel warmer than the glass after twenty minutes.

This is because the black stone will absorb more light and convert it into heat, making it feel warmer than the glass, which allows most light to pass through it and does not absorb much heat.

The complete question is

Carla did an experiment by placing a piece of smooth, clear glass and a piece of smooth, black stone under a lamp for twenty minutes. Which prediction will most likely be supported by Carla’s experimental results?

a. The glass will feel warmer than the stone after twenty minutes.

b. The stone will feel warmer than the glass after twenty minutes.

c. The glass will reflect all of the light after twenty minutes.

d. The stone will reflect all of the light after twenty minutes.

Answer:

The flow of photons

Explanation:

Final answer:

The flow of water in the Water Wheel simulation represents the flow of electrons, similar to how electrons flow through a circuit.

Explanation:

The flow of water in the Water Wheel simulation represents the flow of electrons. Just like water flowing through a system, electrons can flow through a circuit, powering devices and creating electric current. Changing the flow of water in the simulation is similar to adjusting the flow of electrons in a circuit by changing the voltage or resistance.

The answer is:

The heat absorbed by the iron skillet is equal to 473 Joules.

To solve the problem, we need to use the formula to calculate the quantity of heat absorbed, also, we need to remember that specific heat of the iron, which is equal to:

[tex]s=\frac{0.45J}{g*\°C }[/tex]

Where,

J, is the energy transferred.

g, is the mass of the object or substance.

°C, is the temperature measured in Celsius degrees.

We can calculate the heat absorbed using the following equation:

[tex]q=m*dT*s[/tex]

Where,

q, is the heat absorbed

m, is the mass of the object

dT, is the change in temperature

s, is the specific heat of the substance.

We are given the following information:

[tex]mass=70g\\dT=28\°C-13\°C=15\°C\\s=\frac{0.45J}{g*\°C }[/tex]

So, substituting and calculating, we have:

[tex]q=m*dT*s[/tex]

[tex]q=70g*15\°C*\frac{0.45J}{g*\°C }=472.5J=473J[/tex]

Hence, the heat absorbed is equal to 473 Joules.

Have a nice day!

Answer :I think it is A

Explanation: because it releases enzymes like saliva to break down certain bacteria to be absorbed as food.

This sounds like thermal expansion.

Answer:

Explanation:

Depends on what you are measuring.

For example, in Chemistry, KE is measuring temperature. Temperature is the average of all the molecules present and their motion (using a gas as our base).

In physics, KE at beginning levels, is the speed of a moving object.

Answer:

 B. is the right answer

A) True. protons and neutrons have almost the same mass.

B) Not true. Booo !  protons and neutrons have the same charge.  

C) True.  unlike protons and electrons neutrons have no charge.  

D) True.  protons and electrons have opposite charges.

Answer: the answer would be X

Explanation:

Answer:

X

Explanation:

The energy possessed by the position of the body is called gravitational energy. The formula for the gravitational potential energy is given by

U = m x g x h

Gravitational Potential energy of W:

m x g x h = m x 1.6 x 32 = 51.2 m

Gravitational Potential energy of X:

m x g x h = m x 3.7 x 16 = 59.2 m

Gravitational Potential energy of Y:

m x g x h = m x 1.6 x 35 = 56 m

Gravitational Potential energy of Z:

m x g x h = m x 3.7 x 12 = 44.4 m

The gravitational potential energy is maximum for X

Answer:

Forced vibrations, such as those between a tuning fork and a large cabinet surface, result in much lower sound than was produced by the original vibrating body. (d.)

Final answer:

The statement that is NOT true about vibrations is that forced vibrations result in much lower sound than produced by the original vibrating body. In fact, a surface like a cabinet amplifies the sound from a tuning fork.

Explanation:

To determine which of the statements about vibrations is NOT true, let's analyze them one by one:

Each of these concepts—forced vibration, sympathetic vibration, and resonance—plays a crucial role in the way objects vibrate and produce sound.

Answer:

D. Any mirror

Explanation:

The main difference between mirrors and lenses is the following:

- Mirrors work based on the principle of reflection: reflection occurs when a light ray hits a surface and it bounces back in the same medium changing direction, withouth crossing the interface between the two mediums. In this case, the speed of the light ray does not change, since it depends only on the refractive index of the medium, n:

[tex]v=\frac{c}{n}[/tex]

where c is the speed of light in vacuum: and since the light ray is reflected into the same medium, n does not change, so the speed does not change.

- Lenses work based on the principle of refraction: refraction occurs when a light ray crosses the interface between two mediums, changing direction. However, in this case the speed of the ray also changes: in fact, the ray is now in a different medium, so according to the equation

[tex]v=\frac{c}{n}[/tex]

the speed of the light ray has also changed.

Therefore, the correct answer is

D. Any mirror

Answer:

D. any lens - a p e x

350km/5.15 hours~68km per hour

Answer:

Infrared

Explanation:

This is the electromagnetic spectrum just above the visible light spectrum with higher energy (and higher frequency). This electromagnetic radiation is responsible for feeling the heat when you place your hand close to the side of a fire. It is also harnessed in night vision where bodies that emit some form of heat are visible due to their emission of IR.

Heat transfer by radiation primarily depends on the surface area, the fourth power of the absolute temperature, and the emissivity of the object. This is dictated by the Stefan-Boltzmann law of radiation. All objects based on their temperature difference with the surrounding environment absorb and emit radiation leading to heat transfer.

Heat transfer by radiation depends on several factors. The primary ones are the surface area of the object, the fourth power of the absolute temperature, and the emissivity of the object. This can be represented by the equation from the Stefan-Boltzmann law of radiation: = oеAT4, where o is the Stefan-Boltzmann constant, A is the surface area of the object, T is the absolute temperature and e is the emissivity.

All objects release and absorb radiation. The net rate of heat transfer by radiation (absorption minus emission) relates to both the temperature of the object and the surrounding environment. For example, on a sunny day, the radiation from the sun warms your skin, demonstrating the principle of radiative heat transfer.

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Answer:

10 N, [tex]53.1^{\circ}[/tex] north-east

Explanation:

The two forces applied on the object are perpendicular to each other, so we can find the magnitude of their resultant by using the Pythagorean theorem:

[tex]R=\sqrt{(6 N)^2 + (8 N)^2}=10 N[/tex]

The direction of the force instead is given by

[tex]\theta = tan^{-1} (\frac{F_n}{F_e})[/tex]

where F_n is the force pointing north, and F_e is the force pointing east, and the angle is measured with respect to the east direction. Substituting,

[tex]\theta=tan^{-1} (\frac{8 N}{6 N})=tan^{-1} (1.333)=53.1^{\circ}[/tex]

Yes indeed, that is a true statement.  Truer words are seldom written, and I could not agree with you more.

In case you are asking a question, I can kind of see how this might be a question if there is a blank after "... the change in ..." that is to be filled with one or more new words.

If that is the situation, then the blank can be filled with "frequency or wavelength" .

The Doppler effect is the change in the wavelength (or frequency) of energy in the form of a wave due to the motion of the source and/or receiver.

                                             f’ = f (c + vr) / (c + vs)

where,

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Answer:

For a gas held at constant temperature, we can apply Boyle's law, which states that the product between the gas pressure and its volume is constant:

[tex]PV=const.[/tex]

where

P is the pressure

V is the volume

As we see from the equation, P and V are inversely proportional to each other: this means that when the volume is decreased, the pressure increases, and vice-versa. The reason for that is that when the volume is decreased, the gas is compressed, so the molecules of the gas come closer to each other, so they collide more frequently with the wall of the container, exerting therefore a greater pressure.

Answer:

The first one put 1's

Explanation:

Answer: The answer is A

Explanation: The bumper is the first part of an automobile to be impacted when in a head-on accident

Answer:

Newton's third law of motion says that for every action there is an equal and opposite reaction.

Explanation:

This law explains that when two bodies interact with one another, two forces facilitates this process.These forces are opposite is action but equal in magnitude.For example, when sitting on a coach, the body exerts force on the coach downwards and the coach exerts an upward force on the body.These two forces are the action and reaction forces.

Answer:

Explanation:

Newton's third law of motion says that for every action there is equal magnitude force acting in opposite direction. For example if we push a wall with our hands, the wall will also exert the force of equal magnitude in opposite direction.This is general thing when two bodies interacts with each other they produce same force in opposite direction on each other.

Answer: A lizard :)

Explanation:Frogs lay there eggs in the water for example a underwater stick. Newts also lay there eggs underwater or in a underwater enviroment. And catfishes also lay they eggs under water. Where i live (Florida) there are millions of lizards and sometimes i find them on the ground or on land. I also did some research and its a fact that lizerds do in fact lay there eggs on the ground.

I really hope this helps have a great rest of your day :) :) :) :) :)

Answer:

B. X-rays!

Explanation:

Answer:on apex the correct answer is true

Explanation:

the upward force the desk pushes on the book.

from the free body diagram of the book, it is clear that on the book, there are two forces acting.

1) normal force F by the desk in Upward direction.

2) force of gravity by earth in downward direction.

The Upward normal force by the desk on the book balances the force of gravity by earth in downward direction. that is why the book remains stationary on the desk.

The normal force acting on the book is a supporting force that is equal in magnitude and opposite in direction to the book's weight, keeping it in static equilibrium.

A book is sitting on a desk, and the best description of the normal force acting on the book is that it is a supporting force exerted by the desk that is perpendicular to and away from the surface. This force is necessary to support the weight of the book, counteracting the force of gravity and preventing the book from accelerating downwards. Newton's third law of motion tells us that this normal force is equal in magnitude and opposite in direction to the force that the book exerts on the desk, which is its weight due to gravity. In this instance, if the desk exerts an upward force of 32 N, this is because the book's weight (force due to gravity) is also 32 N, resulting in a state of static equilibrium where the net external force on the book is zero.

Answer: Thermal and Elastic

Explanation:

Answer:

thermal and gravitational potential

Explanation:

because

when we gives thermal energy then

its energy is change into kinetic energy

and

any object goes up then its kinetic energy change into gravitational potential energy