I really don’t get it so if someone could help me that would be great

According to this, the laser always has higher energy than what is required to break the bond. A portion of the energy is utilized to break the bond, the rest is transformed into heat.

Kilowatt-hours are the unit used by your electric meter to measure power use. One kilowatt hour is equal to one thousand watt-hours. For instance, the energy usage is computed as 100 watts x 10 = 1,000 watts if a 100-watt light bulb is on for 10 hours.

Watts are units used to measure the power of electricity. One ampere under the pressure of one volt is equal to one watt of electrical power. The power of one watt is negligibly little.

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I think your answer is D

because you already said its not a B is a liquid and  not a solid so its harder to have a chemical change C is solutions and D is compound and I know for a fact that a compound is a solid and if C is also a solid then that could also be a possible answer choice.

Compounds can be broken down during chemical, but not physical, changes, therefore the correct answer is option D

The chemical compound is a combination of two or more either similar or dissimilar chemical elements.

for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

Electrostatic, covalent, and hydrogen bonds are the three basic types of chemical bonds that are used to generate these chemical compounds from their component atoms.

In a physical change, the substance's shape or appearance changes, but the type of stuff it contains stays the same. In contrast, when matter undergoes a chemical transformation, at least one new substance with novel features is created.

Since compounds can break down with chemical changes but not physical ones, option D is the right response.

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Answer:

[tex]g_h = -39.4\ m/s^2[/tex]

Explanation:

The formula for the value of the acceleration due to gravity at a height "h" from the surface of Earth is given as follows:

[tex]g_h = g(1-\frac{2h}{R} )[/tex]

where,

[tex]g_h[/tex] = acceleration due to gravity at height h from the surface of Earth = ?

g = acceleration due to gravity on the surface of the Earth = 9.81 m/s²

h = height from the surface of the Earth = 1.6 x 10⁷ m

R = Radius of the Earth = 6.378 x 10⁶ m

Therefore,

[tex]g_h = (9.81\ m/s^2)(1-\frac{2(1.6\ x\ 10^7\ m)}{6.378\ x\ 10^6\ m})[/tex]

[tex]g_h = -39.4\ m/s^2[/tex]

The work you do when pushing a shopping cart twice as far while applying double the force is twice as much as force.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Contact forces are the kinds of forces that develop when two objects interact and appear to be in physical contact with one another. Frictional forces, tensional forces, normal forces, air resistance forces, and applied forces are a few examples of contact forces.

Forces that come from action at a distance.

Therefore, The work you do when pushing a shopping cart twice as far while applying double the force is twice as much as force.

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Answer:

F = G M m / R^2               or g = F/ m = G M / R^2

(A) A small high mass planet obviously fits the first description.

The value of T when a particle is at rest is 0. The velocity of the particle at t=0 is zero because the particle is in rest position and did not moving at any of the instance or travelling at an uniform speed through out the whole journey or yet did not start from the source point.

Velocity is the rate of change of velocity. At any point on a trajectory, the magnitude of the velocity is given by the rate of change of velocity in both magnitude and direction. Velocity of the body that we can consider is the increasing value of the velocity of any object at a constant rate and that of we can calculate. Hence by the primary information that we have we can formerly consider that the velocity which is acting on the particle at t=0 is zero because the particle is in rest position and did not moving at any of the instance or travelling at an uniform speed through out the whole journey or yet did not start from the source point and the value of T when a particle is at rest is zero.

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Torque is defined as the cross product of the force and the distance from the center to the point of application (force = r * F * sin) (theta)

Keep in mind that at 90 degrees, the torque is at its highest level. Finding the lever arm and multiplying it by the applied force is a useful method for calculating the amount of torque. The distance that separates the force's line of action from its rotational axis is known as the lever arm.

Perpendicular describes two straight lines that meet at a 90-degree angle. When it comes to geometric proofs and examining various vertices and angles, perpendicular lines can be used in a variety of ways. They are helpful for making sure things are straight and aligned properly when painting or building.

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Answer:

The average temperature is much warmer

Explanation:

Velocity of moving vehicle=v  0, and decceleration =a and Final velocity of the vehicale =0.

Once more, the stopping distance is far more than the braking distance. It starts when the threat is identified and concludes when the car stops.

The reaction distance plus the braking distance, or points 1 and 2, together make up the stopping distance.

Therefore, in order to compute the necessary stopping distance, I must determine and add two partial values (reaction distance + brake distance). The reaction time is the amount of time it takes for a driver to spot a danger before braking.

Therefore, Velocity of moving vehicle=v  0, and decceleration =a and Final velocity of the vehicale =0.

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Answer:

$4.80

Explanation:

Total energy used is found with this formula:
[tex]E = Pt[/tex]

where:
[tex]E[/tex] is energy (in kilowatt-hours)
[tex]P\\[/tex] is power ( in Kilowatts)
[tex]t[/tex] is time ( in Hours)

We can find the total power consumption by adding all the appliances, then dividing by 1000 to convert it from Watts to Kilowatts:

[tex]\frac{(40*2)+120}{1000} =0.2kW[/tex]

And then find [tex]E[/tex] with 5 hours a day for 30 days:

[tex]E= 0.2*(5*30)=30kWh[/tex]

Thus, cost needed would be:

$0.16 × 30 = $4.80

Answer:

A, B, C, E

Explanation:

The atmosphere does not recycle water and other chemicals

The velocity of the object when it first reaches a height of 8.10 meters is 18.05 m/s.

To find the speed of the stone when it is 8.26 m higher, we can use the equation for vertical motion under constant acceleration. The equation is:

v^2 = u^2 + 2as

Where:

v = final velocity (m/s)

u = initial velocity (m/s)

a = acceleration due to gravity (9.8 m/s^2, downward)

s = distance traveled (m)

In this case, the initial velocity is 18.1 m/s, the distance traveled is 8.26 m upward, and the acceleration due to gravity is 9.8 m/s^2 downward. We can substitute these values into the equation and solve for the final velocity.

v^2 = 18.1^2 + 2 * 9.8 * 8.26

v^2 = 327.61

v = sqrt(327.61)

v = 18.05 m/s

Air resistance is the term for the frictional force that slows an object's velocity as it moves through the air. Although air resistance considerably affects trajectory motion, it is not taken into account in beginning physics due to the complexity of the calculations.

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According to the given statement The tension force in each rope is T = 14g/2Sin N, according to the information provided.

Tension is the force that is transmitted through a cable, rope, or wires when it is stretched by loads exerted from opposing sides. The bodies are put through an identical degree of strain at each end of the wire by the tension force, which is exerted all along entire of the wire's length.

Let the tension in each rope be T₁ & T₂

Also, T₁ = T₂ = T

T₁ Sinθ + T₂ Sinθ = mg

2T Sinθ = mg

2T Sinθ = 14g

T = 14g/2Sinθ

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A decomposition chemical reaction caused by light is the decomposition of hydrogen peroxide.

It is represented by the following equation:

[tex]2 H_{2} O_{2}(aq)[/tex]  →  [tex]2 H_{2}O(l)[/tex] [tex]+ O_{2} (g)[/tex]

The decomposition of hydrogen peroxide is a chemical reaction in which hydrogen peroxide is broken down into its component parts: water and oxygen gas.

This reaction is typically caused by the absorption of light energy, which causes the chemical bonds within the hydrogen peroxide molecule to break.

This reaction is often used as a demonstration of the principles of light-induced decomposition reactions, as it is relatively simple and easy to observe.

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Given :

Some objects with different mass.

To Find :

Which of these object will exert the greatest gravitational force on a box, if the distance between them remains the same.

Solution :

We know, gravitation force between two object is given by :

[tex]F = \dfrac{Gm M}{d^2}[/tex]

Here m, G and d are constant.

From the above equation we can see that if every other thing remains constant the gravitations force remains constant if mass of other plant increase.

Therefore, object of mass 8 kg will exert the greatest gravitational force on a box.

Answer: 8 kg mass

Explanation:

Took the test

Answer:

B. Increase in proportion to the wavelength of a wave.

Explanation:

An electromagnetic spectrum refers to a range of frequency and wavelength that an electromagnetic wave is distributed or extends. The electromagnetic spectrum comprises of gamma rays, visible light, ultraviolet radiation, x-rays, radio waves, and infrared radiation.

Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.

Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.

Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.

Wavelength is simply the distance from one peak of an electromagnetic wave to the next peak. This distance is also equal to the distance from one trough of a wave to another.

Mathematically, wavelength is calculated using this formula;

[tex] Wavelength = \frac {speed}{frequency} [/tex]

Hence, the waves in the electromagnetic spectrum have a speed that increase in proportion to the wavelength of a wave.

The amount of heat transferred from the system is -720j, hence option d is the proper response. It passes through a process where its internal energy drops by 500 joules in a thermodynamic system.

The system receives 220 joules of work at the same time. A thermodynamic system's internal energy is the energy that it contains, excluding the energies that are determined by how it interacts with its environment, such as the system's overall kinetic energy of motion and its overall potential energy with regard to external force fields. The definition of heat in thermodynamics is the kind of energy that crosses a thermodynamic system's boundary.

U = Q+W

Q = U - W Q = -500 -220 = -720J

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Answer:

ok

Explanation:

Answer:

The change of movement depends on the force that acts and the length of time it acts.

For 0. 250 moles of gas in a piston, the change in internal energy is +131J. While 240 J of heat are supplied, the gas produces 109 J of work. The energy is a thermodynamic system's internal energy.

With the exception of the energies that are determined by how the system interacts with its environment, the system as a whole's kinetic energy of motion and potential energy with respect to external force fields are all that are contained within it. A typical kind of skin development are moles. Clusters of pigment-forming cells are what give them their common appearance as small, dark brown dots (melanocytes).

Internal energy change for U = Q+W is 240+(-109) = +131J.

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The required net force on the car with certain mass and travelling with deceleration is said to be 5000 N.

Given that,

Mass of the car m = 1000 kg

Velocity of the car v = 20 m/s

Time t = 4 sec

Net force on the car = ?

According to Newton's second law of motion, it is said mathematically that, F = m a ---(1)

Acceleration a can be written as the rate of velocity.

a = (v-u)/t = (0 - 20)/4 = - 5 m/s² ---(2)

Substituting (2) in (1) we have,

F = m a = 1000 × - 5 = -5000 kg m/s² or -5000 N

Thus, the required net force on the car is 5000 N.

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Answer:

b

Explanation:

The spreading of waves as they go through an aperture or around objects is known as diffraction. When the wavelength of the incident wave and the size of the aperture or obstruction are on the same order of magnitude, it happens.

More specifically, when applied to light, diffraction of light happens when a light wave travels past a corner or through an opening or slit that is physically smaller than the wavelength of that light, if not smaller.

The most frequent instance of diffraction is water waves that bend around a fixed object. Around the border of an item, light flexes similarly. Two tiny apertures are depicted in the animation as wave fronts travel through them.

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Insignificant are air resistance and rope mass. Point C on a support is where a rope of length L is fastened.

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Put your finger over P to compute power; this leaves I and V; hence, P = I x V.

The quantity of current multiplied by the resistance equals the potential difference, which is the same as voltage. One Coulomb of charge uses one Joule of energy to move between two locations in a circuit, which is equal to a potential difference of one Volt.

Difference that might exist at all between the two points The amount of work required to move a unit positive charge along any path through one point to another without accelerating is referred to as the electric field.

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The gravitational force on the car is 23000 N, the vertical normal (support/reaction) force acting on the car is 0 N, and the horizontal force on the car's tyres from the road is 5460 N.

Mass of the car, m = 2300 kg

Force acting on the car, F = 5000 N

The initial speed of the car, u = 10 m/s

The final speed of the car, v = 14 m/s

Time, t = 20 s

The gravitational force on the car is calculated by the formula given as

F = mg

F = 2300 × 10

F = 23000 N

Now, as there is no vertical movement in the car therefore the vertical force acting on the car is 0 N.

The horizontal force on the car's tyres from the road

= force acting on the car + net force on the car

= 5000 + ma

= 5000 + 2300 × (v-u)/t

= 5000 + 2300 × (14 - 10)/20

= 5000 + 2300 × 4/20

= 5000 + 460

= 5460 N

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Answer:

C. Bears lose necessary body fat because they must swim longer in open ocean water

Explanation:

The two energy sources that are used in homes the most are electricity and natural gas. Natural gas is a non-renewable energy source, whereas electricity that is generated from unconventional sources is.

Sunlight, water, wind, and geothermal sources like hot springs and fumaroles are examples of renewable resources. Petroleum and coal are examples of fossil fuels that are non-renewable resources. The majority of renewable resources have small carbon footprints and low carbon emissions.

A well-built and securely sealed thermal envelope, controlled ventilation, appropriately sized, high-efficiency heating and cooling systems, and energy-efficient doors, windows, and appliances are the essential components of the majority of energy-efficient homes, despite construction costs, options, and styles being different.

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The best angle for maximum height and air time when launching an object is 90 degrees. At 90 degrees, the vertical velocity component is at its maximum, allowing the object to reach the highest point. Additionally, the horizontal velocity component is at its minimum, which means that the object will spend more time in the air.

This is because at 90 degrees, the object is moving straight upward and as gravity acts vertically downwards, the object will reach highest point and stay there for longer time as compare to other angles.

However, it's important to note that 90 degrees is ideal for maximum height, but not for maximum distance traveled. For maximum distance, the optimal angle would be 45 degrees, where the horizontal velocity and vertical velocity are equal, as the object will both travel the farthest and reach the highest point.

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