A student pushes against a wall with 20N of force and the wall does not move. In this situation, the wall exerts -
F 0N of force.
G 20N of force.
H less than 20N of force.
J more than 20N of force.

1.5m/s2

F=ma

a=F/m

a=60/40

a=1.5m/s2

The acceleration of the cart is 1.5 meter per seconds square.

Given the following data:

To find the acceleration of the cart, we would use Newton's Second Law of Motion.

Mathematically, Newton's Second Law of Motion is given by the formula;

\(Acceleration = \frac{Net\; Force}{Mass}\)

Substituting the given parameters into the formula, we have;

\(Acceleration = \frac{60}{40}\)

Acceleration = 1.5 meter per seconds square.

Therefore, the cart's acceleration is 1.5 meter per seconds square.

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Answer:

1200 watts

-hope this helps

The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.

This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.

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A 0.1mm diameter glass tube is inserted into an ethyl alcohol at 20 degrees centigrade in a cup. The angle of alcohol with the tube is 0 degrees. D = 0.1 mm = 0.001m, alcohol angle is 0 degrees, ethyl alcohol

\(η=1.1×10^-3 N⋅sec/ m², s_g\)

=0.79.

We have to determine how much glycerin rises in the tube. The force that moves the liquid through the tube is the difference between the downward force of gravity on the liquid column and the upward capillary force produced by the surface tension of the liquid against the walls of the tube.

The height to which the fluid rises in a capillary tube may be measured by balancing the capillary force against the force of gravity on the column.

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Answer:

C. Overcome Friction

Explanation:

When using any machine usually those with moving parts, you may notice heat forming near the areas where most movement occurs. As friction continues, more energy is used up and released as heat. For that reason, the efficiency of a machine will forever be less than 100%

Toasting a piece of bread is an example of a chemical change. It can't be reversed that's why it is irreversible.

During toasting, the heat causes a chemical reaction in the bread known as the Maillard reaction. This reaction occurs between the amino acids and the reducing sugars in the bread, which results in the formation of new compounds, including melanoidins, which give the bread its characteristic brown color and flavor.

Furthermore, toasting also involves the evaporation of water from the bread, which changes its texture and makes it crispier.

Therefore, toasting a piece of bread involves chemical changes in the bread's composition, resulting in the formation of new compounds, which is why it is considered a chemical change.

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Given,

The length of the slab, L=12 m

The initial temperature, T₁=10°C

The final temperature, T₂=30°C

The coefficient of the linear expansion of the concrete is α=12×10⁻⁶ /°C

The change in the length of the slab is given by,

Where ΔT is the change in the temperature.

Therefore,

On substituting the known values,

Thus the expansion in the length of the slab in the given temperature range is 0.003 m.

Thus the gap between the slabs should be 0.003 m

The object that has potential energy is the can of gasoline.

Potential energy is described as the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

The forms of potential energy includes:

Potential energy is described as the energy a system has due to position, shape, or configuration.

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When a fragment of bone containing carbon-14 isotopes of the element carbon is discovered during an archaeological dig, and it is estimated to be approximately 23,000 years old, one can calculate the proportion of the carbon-14 isotopes that remains.

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Answer: That is not a question.

Explanation: It is a random jumble of letters. It also has no question mark.

Un velocista que parte del reposo con una aceleración de 4m/s^2 y la mantiene durante 4s alcanzará una velocidad de 16m/s y recorrerá una distancia de 32m al cabo de esos 4s.

Para calcular la velocidad alcanzada, utilizamos la fórmula V = a*t, donde V es la velocidad, a es la aceleración y t es el tiempo. Sustituimos los valores dados en la fórmula:
V = 4m/s^2 * 4s = 16m/s
Para calcular la distancia recorrida, utilizamos la fórmula S = (a*t^2)/2, donde S es la distancia, a es la aceleración y t es el tiempo. Sustituimos los valores dados en la fórmula:
S = (4m/s^2 * 4s^2)/2 = (4m/s^2 * 16s^2)/2 = 32m
Por lo tanto, el velocista alcanzó una velocidad de 16m/s y recorrió una distancia de 32m al cabo de 4s.

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Answer:

The statement H is the correct one: The number of atoms on the reactant side equals the number of atoms on the product side.            

Explanation:

The law of conservation of mass states that mass can not be created or destroyed, just can be transformed. The mass of a system can not be added or removed, thereby the transfer of mass in a reaction must remain constant.  

This implies that the mass of the molecules on the side of the reactants before the reaction must be equal to the mass of the atoms on the side of the products after the reaction.

Therefore, the statement H is the correct one: The number of atoms on the reactant side equals the number of atoms on the product side.                  

I hope it helps you!

Answer:

p = 3000 kg-m/s.

Explanation:

Given that,

Mass of shark, m = 200 kg

Speed of the shark, v = 15 m/s

We need to find the momentum of the shark. It can be calcullated as follows :

\(p=200\ kg\times 15\ m/s\\\\p=3000\ kg-m/s\)

So, the momentum of the shrak is 3000 kg-m/s.

Answer:

4 smaller disks

Explanation:

We are given;

Mass of smaller and larger disks = M

Radius of smaller disk = R

Radius of larger disk = 4R

Formula for moment of inertia about cylinder axis is:

I = ½MR²

Thus;

For small disk, I_small = ½MR²

For large disk, I_large = ½M(2R)² = 2MR²

We are told that moment of inertia of System A consists of two of the larger disks. Thus;

I_A = 2 × I_large = 2 × 2MR²

I_A = 4MR²

We are also told that System B consists of one of the larger disks and a number of the smaller disks. Thus;

I_B = I_large + n(I_small)

Where n is the number of smaller disks.

I_B = 2MR² + n(½MR²)

I_B = MR²(2 + n/2)

We are told that the moment of inertia for system A equals the moment of inertia for system B. Thus;

I_A = I_B

So;

4MR² = MR²(2 + n/2)

MR² will cancel out to give;

4 = 2 + n/2

Multiply through by 2 to give;

8 = 4 + n

n = 8 - 4

n = 4

3.375m/s is the final velocity of the car.

The final velocity depends on how large the acceleration is and the distance over which it acts.

Initial velocity of an object, you can multiply the acceleration due to a force by the time the force is applied and add it to the initial velocity to get the final velocity.

According to the question,

A toy car starts from the rest and accelerates

So the acceleration = 1.50m/s²

Time =  2.25s

\(x=x_{0} + vt\)

\(x = 0 + ( 1.50m/s^2*2.25s)\)

\(x = 3.375m/s\)

The final velocity, of the car is 3.375 m/s.

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Answer:

Cardboard, Paper towels, Food waste, and wooden based items

Answer:

How fast do things biodegrade?

Vegetables 5 days –1 month

Aluminium cans 80–100 years

Glass bottles 1 million years

Styrofoam cup 500 years to forever

Plastic bags 500 years to forever

When something is painted red, the color that is most absorbed is green.

Color perception is based on the reflection and absorption of light. Different colors correspond to different wavelengths of light. When an object appears red, it means that it is reflecting light primarily in the red wavelength range and absorbing other wavelengths.In the case of red objects, they appear red because they selectively absorb light in the blue and green wavelength ranges while reflecting light in the red wavelength range. The red pigment or dye used in the paint absorbs the complementary color, which is green. As a result, the green light is mostly absorbed by the object, while the red light is reflected, giving the object its red appearance.Therefore, when something is painted red, it means that it absorbs the color green the most.

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At 0.0804 km altitude the 1% of the mass of the atmosphere lies above and 99% of the mass lies below. Assumptions made are the global mean surface pressure of 1000 hPa is a representative value and the scale height is assumed to be constant throughout the entire atmosphere.

First, we need to calculate the pressure at the desired percentiles (1% and 99%) relative to the surface pressure.

For 1% of the mass lying above, we consider the pressure to be 1% of the surface pressure:

1% of 1000 hPa = 0.01 × 1000 hPa

= 10 hPa.

For 99% of the mass lying below, we consider the pressure to be 99% of the surface pressure:

99% of 1000 hPa = 0.99 × 1000 hPa

= 990 hPa.

Next, we use the exponential relationship between pressure and altitude:

P = P0 × exp(-z/H),

where P is the pressure at a given altitude, P0 is the surface pressure, z is the altitude, and H is the scale height.

To find the altitude z at which the pressure is equal to 10 hPa (1% of the surface pressure), we rearrange the equation:

10 hPa = 1000 hPa × exp(-z/H).

Taking the natural logarithm (ln) of both sides, we have:

ln(10 hPa / 1000 hPa) = -z / H.

ln(0.01) = -z / 8 km.

z = -8 km × ln(0.01).

Evaluating the expression:

z = -8 km × (-4.605)

= 36.84 km.

Therefore, 1% of the mass of the atmosphere lies above an altitude of approximately 36.84 km.

Similarly, to find the altitude z at which the pressure is equal to 990 hPa (99% of the surface pressure), we follow the same procedure:

990 hPa = 1000 hPa × exp(-z/H).

ln(990 hPa / 1000 hPa) = -z / H.

ln(0.99) = -z / 8 km.

z = -8 km × ln(0.99).

Evaluating the expression:

z = -8 km × (-0.01005)

= 0.0804 km.

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The net force on the box perpendicular to the floor is

∑ F[perp] = F[normal] - mg = 0

where mg is the weight of the box. Then

F[normal] = (35.5 kg) g = 347.9 N

Since the box slides with constant speed, the net force parallel to the floor is

∑ F[para] = F[applied] - F[friction] = 0

We have

F[friction] = 0.15 F[normal] = 52.185 N

so that

F[applied] = F[friction] ≈ 52 N

Answer:

Option A.

Explanation:

We define the half time T as the time such that an initial quantity A reduces to its half.

So we can model the quantity as a function of time like:

P(t) = A*e^(-k*t)

Then for the half time, T, we will have:

P(T) = A/2 = A*e^(-k*T)

solving for k, we get:

A/2 = A*e^(-k*T)

1/2 = e^(-k*T)

ln(1/2) = ln( e^(-k*T)) = -k*T

-ln(1/2)/T = k

Here we know that the half time is T = 26.5s

if we input that in the above equation, we get:

-ln(1/2)/26.5s = k = 0.0262 s^-1

Then the correct option is A

Answer:

No, they will not change.

Explanation:

The internal energy of the gas can be obtained as  1373 J.

The total kinetic and potential energies of the individual molecules that make up a gas are referred to as the gas' internal energy.

In other words, it is the energy resulting from the gas particle's interactions and random motion.

We kn ow that the internal energy can be given by the formula;

U = q + w

U = internal energy

q = heat

w = work done

Thus;

w = pdV

w = 3 (4 -1)

w = 9atmL

Since

1 L atm = 101.325 J

9atm L = 912 J

Then;

U = 461 + 912

= 1373 J

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The floor and the Earth exert significant forces on the box.In this scenario, the box is influenced by significant forces from both the floor and the Earth

When considering the box as the system of interest, the floor exerts an upward normal force on the box to support its weight. According to Newton's third law, the box also exerts an equal and opposite downward force on the floor. Additionally, the Earth exerts a downward gravitational force on the box, which gives rise to its weight.

In this scenario, the box is influenced by significant forces from both the floor and the Earth. The floor provides the necessary support to counteract the weight of the box, while the Earth's gravitational force acts to pull the box downward.

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Maximum wavelength of light which is capable of dissociating the i-i bond in one molecule of iodine is 7.826 nm.

Bond dissociation energy is the is the measure of strength of a chemical bond. It is the amount of energy required to break one mole of covalently bonded molecule. The bond dissociation energy can be calculated by:

Bond dissociation energy = Bond energy/Avogadro's number

Energy = 153 × 10³ ÷ 6.022 × 10²³

Energy = 2.540 × 10⁻¹⁹ Joules

Now, maximum wavelength of light required to break the bond can be calculated by the formula:

E = hc/λ

where, E is the energy required, h is Planck's constant and c is the speed of light

E = hc/λ

λ = hc/E

λ = 6.626 × 10⁻³⁴ × 3× 10⁸/2.540 × 10⁻¹⁹

λ = 7.826 × 10⁻⁷ or 7.826nm.

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Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

A resistor that is 1/8 inch in diameter and 3/8 inch long is most likely a cylindrical carbon composition resistor, commonly used in electronic circuits for its stability and reliability. Its specific resistance value and power rating can be identified by decoding the color bands on the resistor's body.

A resistor that is 1/8 inch in diameter and 3/8 inch long can be classified as a cylindrical carbon composition resistor. Carbon composition resistors are widely used in electronic circuits due to their stability, reliability, and low cost. These resistors are made from a mixture of carbon powder and an insulating material, typically ceramic, and are shaped into a cylindrical form.

The physical size of a carbon composition resistor is directly related to its power rating. In this case, the resistor's dimensions suggest that it is a relatively small component, likely designed for a low-power application. The power rating of a resistor is usually expressed in watts and determines the maximum amount of electrical energy it can dissipate without being damaged.

To identify the specific value and power rating of this resistor, you would need to examine its color bands, which are typically located on the cylindrical body of the component. The color bands represent a standardized code that indicates the resistor's resistance value (measured in ohms) and tolerance (the variation allowed in the resistance value). By decoding the color bands, you can determine the resistor's exact specifications.

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In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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Explanation:

jouleeeee is the unit kinetic energy is measured in and kinetic energy formula is 1/2mv (square)

A mixture is a combination of two or more substances that are not chemically combined. The characteristics of a mixture include all options.

Therefore, the correct answers are B, C, and D.

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Answer:

Decrease the charge of one of the particles