according to lenz's law, the induced current in a circuit always flows to_________the original change in the external magnetic flux
a. oppose
b. strengthen
c. enhance

Answer:

All but felicia are right I believe?

Explanation:

Answer:

Según la actitud del hablante las oraciones se clasifican en enunciativas, interrogativas, etc. ... adverbios o expresiones que complementan a toda la oración (COr): ojalá, quizá.

Explanation:

question: Please help!!!

If a bottle is being squeezed with a force of 10 Newtons and the area of the bottle is 15

squared inches. What is the pressure??

Answer:

1025.64 N/m²

Explanation:

Pressure: This can be defined as the ratio of force to area. The si unit of pressure is N/m².

From the question,

P = F/A........................ Equation 1

Where F = Force, A = Area.

Given: F = 10 Newtons, A = 15 Squared Inches = (15×0.00065) = 0.00975 m²

Substitute these values into equation 1

P = 10/0.00975

P = 1025.64 N/m²

Hence the pressure of the bottle is 1025.64 N/m²

Answer:

0.66 psi

Explanation:

Answer:

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

"some elements have only one stable isotope"

Explanation:

there ya go! Pls give me brainliest!

Answer:

3)No, it's speed is constant.

the average upward force applied by the spring is 0.748 N.

Given that a vertical spring is compressed and, when released, applies a force during a 0.25 s time interval to a 17 g frog, which is flung upward due to the applied force from the spring, and the frog attains an upward velocity of 11 m/s after being released from the spring.

The mass of the frog (m) = 17 g = 0.017 kg

The upward velocity of the frog after being released from the spring (v) = 11 m/s

The time interval during which force is applied by the spring (t) = 0.25 s

The average upward force applied by the spring can be calculated by using the formula:

F = ma

Where,F is the force applied by the spring

m is the mass of the frog

v is the upward velocity of the frog

t is the time interval during which force is applied by the spring

Substituting the given values in the formula:

F = (m × v) / t

F = (0.017 × 11) / 0.25F

= 0.748 N

Thus, the average upward force applied by the spring is 0.748 N.

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Answer:

No, I don't think so.

Explanation:

If you calculate using the formula;

Eₖ = 1/2 × m × v²

with different values of velocity, both answers would differ!

If an object has a greater velocity, that means it uses greater kinetic energy!

I hope this helps! Please let me know if I have any misconceptions and feel free to ask me questions! :D

Yes, two objects with different velocities can have the same kinetic energy.What is kinetic energy?Kinetic energy is a type of energy that an object possesses as a result of its motion.

The kinetic energy of an object depends on two factors: the mass of the object and the velocity at which it is moving. The formula for calculating the kinetic energy of an object is: KE = 1/2mv² where KE is kinetic energy, m is the mass of the object, and v is its velocity.If two objects with different velocities have the same kinetic energy, it means that the product of their mass and the square of their velocities are equal.

It is possible because the velocities of the two objects are not the same, but the product of the mass and the square of the velocities is the same. This demonstrates the principle of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.

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The slope increases or decreases downstream, are less common and do not accurately represent the typical longitudinal profile of a streambed.

The sketch that best represents the longitudinal profile of the slope of a streambed is option A. In this case, the slope is constant and steep downstream.

This means that the streambed maintains a consistent, steep gradient as it progresses in the downstream direction. This profile is commonly associated with youthful streams or those in mountainous regions, where the force of gravity allows the water to flow rapidly down steep slopes.

Option B, where the slope is constant and shallow downstream, is more characteristic of mature or old-age streams.

Options C and D, where the slope increases or decreases downstream, are less common and do not accurately represent the typical longitudinal profile of a streambed.

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When transferring a vacuum furnace chamber from atmospheric pressure to a supposedly "rough" vacuum, the roughing valve is utilized (typically in the range of 10 -2 to 10 -3 Torr).

This degree of vacuum is sometimes sufficient to carry out the targeted process. Another common name for vacuum is negative pressure (or soft vacuum). This happens when an application needs to keep track of both pressure increases and pressure drops in both directions above and below the atmosphere. The difference in pressure between the exhaust exit and input provides the basis for a vacuum.

We all know that water and air travel from high altitude to low altitude, and that a vacuum is produced by a difference in pressure between the two.

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Answer:

2as=v2-u2

2000=v2

V=44

V=u+at

44/10=t

T=4.4seconds

Explanation:

FALSE. When you are close to the mirror, your image will appear larger than when you are far away from the mirror.

A mirror is an object which has a reflective surface, usually made of glass and coated with a metal, such as silver, which allows light to be reflected off it. Mirrors are used for a variety of purposes such as for personal grooming, decoration and for checking one's appearance. They can also be used for scientific and medical purposes such as for optical and laser applications. Mirrors are also used to create illusions and for a variety of optical effects. They are also used in photography and film making.

This is because the closer you are to the mirror, the more of your body will be able to fit into the reflection. Conversely, when you are further away, your reflection will appear smaller as less of your body is able to fit into the reflection.

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Answer: 0.16s

Explanation:

Given the following :

Average spring force by the racquet (F) = 225N

Change in momentum = 35kgm/s

To determine the change in interaction time; that is the momentary for e acting in the tennis ball ( impulse)

Recall:

F = mass(m) × acceleration(a)

Acceleration (a) = change in Velocity with time

a = change in V / time(t)

F = m * change in V / t

Ft = m* change in v

Recall m* change in v = momentum

Ft = change in momentum

225 * t = 35

t = 35 / 225

t = 0.1555555

t = 0.16s

The time taken is twice the time taken to decrease from the initial voltage to one-half initial voltage.

The amount of time it takes for a voltage to decrease from one level to another depends on the characteristics of the system generating the voltage.

Assuming that the voltage is decreasing exponentially over time, the time it takes for a voltage to decrease from one level to another can be calculated using the formula:

\(t = -(ln(Vf/Vi))/λ\)

where t is the time taken, Vi is the initial voltage, Vf is the final voltage, and λ is the decay constant of the system generating the voltage.

If the voltage decreases from one-half its initial voltage to one-fourth its initial voltage, then \(Vi = 1, Vf = 1/4\), and the voltage has decreased by a factor of 2.

Assuming that the decay is exponential, the time it takes to decrease by a factor of 2 is:

\(t = -(ln(1/2))/λ\)

We can simplify this expression using the fact that \(ln(1/2) = -ln(2)\), which gives:

\(t = ln(2)/λ\)

Similarly, the time it takes to decrease by a factor of 4 is:

\(t = -(ln(1/4))/λ = ln(4)/λ = 2ln(2)/λ\)

So, the ratio of the time taken to decrease from one-half initial voltage to one-fourth initial voltage is:

\(t(1/4) / t(1/2) = (2ln(2)/λ) / (ln(2)/λ) = 2\)

Therefore, the time taken to decrease from one-half initial voltage to one-fourth initial voltage is twice the time taken to decrease from the initial voltage to one-half initial voltage.

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The wavelength is 1.87 m of these radio waves round your answer to 2 significant digits.

Radio waves are part of the electromagnetic spectrum, any radiation of that electromagnetic spectrum has a speed of 3.00x10⁸ m/s in vacuum.

Consequently, the following equation can be used to determine the wavelength:

c =  λ.ν --------- (1)

Where c is the speed of light, λ is the wavelength and  is the frequency.  

Then, λ can be isolated from equation 1

λ = c / ν --------- (2)

Keep in mind that Hz units must be used to express frequency.

ν = 160 MHz x (1000000Hz/1 MHz)

  = 160000000 Hz

λ = 3 x 10⁸ m/s / 160000000 Hz

But 1 Hz = s⁻¹

λ = 3 x 10⁸ m/s / 160000000 s⁻¹

λ = 1.87 m

Hence, the wavelength is 1.87 m

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The correct answer is  flexible, evolutionarily progressive, and chewable records of every single aspect of an individual's life resistant.

Evolution is defined as genetic changes in population of organisms through time that lead to differences among them.

To evolve successfully, an organism has to survive and pass down its genetic material to its progeny.

All these conditions will be fulfilled only when organism will find food and escape predators to ensure survival.

The skeletal remains told us about the condition of evolution that took place by telling us the structure and other habitual points about the early life.

Therefore, skeletal structure plays a major role in the study of evolution in the preceding life.

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Explanation:

he fell down with telling any one,

a ) The average speed of the horse = 66.67 m / s

b ) The average speed of the skier = 14 m / s

c ) The average speed of your walk = 1.33 m / s

s = d / t

s = Speed

d = Distance

t = Time

a ) For the horse,

d = 1 km = 1000 m

t = 15 s

s = 1000 / 15

s = 66.67 m / s

b ) For the skier,

d = 84 m

t = 6 s

s = 84 / 6

s = 14 m / s

c ) For your walk,

d = 9.6 km = 9600 m

t = 2 h = 7200 s

s = 9600 / 7200

s = 1.33 m / s

d ) For the car,

d = 400 km = 400000 m

t = 4.5 h = 16200

s = 400000 / 16200

s = 24.69 m / s

Therefore,

a ) The average speed of the horse = 66.67 m / s

b ) The average speed of the skier = 14 m / s

c ) The average speed of your walk = 1.33 m / s

d ) The average speed of the car = 24.69 m / s

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We will determine the final speed as follows:

So, superman's final velocity is approximately 201 m/s.

[In this case superman's initial velocity is a datapoint that is not necessary]

Answer:

0.625m

Explanation:

Now Velocity of a wave ,V = frequency × wavelength

Wavelength =velocity /frequency

=500/800 =0.625m

It would take a radio wave with a frequency of 7.25 x 10^5 hz approximately 266.8 seconds, or 4.45 minutes, to travel from Mars to Earth.

To calculate the time it would take a radio wave with a frequency of 7.25 x 10^5 hz to travel from Mars to Earth, we can use the formula:

time = distance / speed of light

The distance between Mars and Earth is approximately 8.00 x 10^7 km. The speed of light is approximately 299,792,458 meters per second, or 299,792.458 kilometers per second.

To convert the distance from kilometers to meters, we multiply by 1000:

8.00 x 10^7 km = 8.00 x 10^10 meters

Now we can plug in the values:

time = (8.00 x 10^10 meters) / (299,792.458 km/s)

Simplifying the calculation, we get:

time = 266.8 seconds

So, it would take approximately 267 seconds for a radio wave with a frequency of 7.25 x 10^5 Hz to travel from Mars to Earth.

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Answer:

Eliminate D as there is no nonconservative force, then look at each energies before and after. The speed of the book will increase, so kinetic energy is increasing. The height of the book is increasing, so gravitational potential energy is increasing. However, since the spring is becoming decompressed, the elastic potential energy is decreasing.

Explanation:

Answer:

it is A

Explanation:

The child's radial/centripetal acceleration at the lowest point of the swing is

a = (3.00 m/s)² / (7.00 m) = 1.29 m/s²

By Newton's second law, the tension in the rope is

T = (3.5 kg) (1.29 m/s²) = 4.5 N

(Does the question really say the child's mass is 3.5 kg? That's little more than the average mass of a newborn, about 3.3 kg. Not exactly a good idea to put a newborn on a swinging rope...)

Answer:2.83 times greater than the average speed of oxygen molecules at the same temperature.

Explanation:The ratio of the average speed of helium molecules to the average speed of oxygen molecules can be calculated using the root mean square (rms) velocity formula:

ratio of rms velocity = sqrt(M2/M1)

where M1 and M2 are the molar masses of the gases.

In this case, the ratio of the molar masses is M2/M1 = 32/4 = 8.

So, the ratio of the rms velocity of helium to oxygen is:

ratio of rms velocity = sqrt(8) = 2.83

Therefore, the average speed of helium molecules is about 2.83 times greater than the average speed of oxygen molecules at the same temperature.

The atomic mass number of the element is approximately 70. The mass density of a substance is defined as the mass per unit volume, while the number density is defined as the number of atoms per unit volume.

In order to determine the atomic mass number of the element, we need to understand the relationship between these two quantities. The mass density can be calculated using the formula:

\(\[ \text{Mass density} = \text{Atomic mass} \times \text{Number density} \times \text{Atomic mass unit} \]\)

Where the atomic mass unit is equal to the mass of one atom. Rearranging the formula, we can solve for the atomic mass:

\(\[ \text{Atomic mass} = \frac{\text{Mass density}}{\text{Number density} \times \text{Atomic mass unit}} \]\)

Substituting the given values, we find:

\(\[ \text{Atomic mass} = \frac{1750 \, \text{kg/m}^3}{4.39 \times 10^{28} \, \text{atoms/m}^3 \times \text{Atomic mass unit}} \]\)

The atomic mass unit is defined as one-twelfth the mass of a carbon-12 atom, which is approximately \(\(1.66 \times 10^{-27}\) kg\). Plugging in this value, we can solve for the atomic mass:

\(\[ \text{Atomic mass} = \frac{1750 \, \text{kg/m}^3}{4.39 \times 10^{28} \, \text{atoms/m}^3 \times 1.66 \times 10^{-27} \, \text{kg}} \]\)

Calculating this expression gives us the atomic mass number of approximately 70 for the given element.

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Resistance (R) = 9.375 ohm (Ω)

Steps:

\(R = \frac{V}{I} \)

\( = \frac{12 \: volt}{1280 \: milliampere} \)

\( = \frac{12 \: volt}{1.28 \: ampare} \)

\( = 9.375 \: ohm (Ω)\)

(a) The decrease in internal energy of the woman, assuming no change in temperature or consumption of food is -9600 J (negative because energy is lost) and (b) her efficiency is 3.64%.

The woman does 350 J of work and 9250 J of heat is transferred from her into the environment in the process. Since the energy transferred as heat is not positive, it is not useful energy. It is energy that is not doing any work. Therefore, the total energy transferred from the woman is 9250 J (as heat).

(a) The decrease in internal energy of the woman, assuming no change in temperature or consumption of food is the sum of the energy transferred as heat and the energy used to do work.

\(\Delta U=Q-W\)

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system. Since no heat is added to the system,

\(\Delta U=-W = -350 \ J - 9250\  J = -9600 \ J\) (negative because energy is lost).

(b) The efficiency of a machine is defined as the ratio of useful work done by the machine to the total energy input. In this case, the woman is the machine.

Efficiency = Useful work output / Total energy input

Total energy input = energy transferred as heat + energy used to do work \(= 9250 \ J + 350 \ J = 9600 \ J\)

Useful work output = Work done = 350 J

Therefore, the efficiency of the woman is

Efficiency = Useful work output / Total energy input

Efficiency \(= 350\  J / 9600\  J\times 100 = 0.0364\times 100 = 3.64%\).

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The projectile Trajectory function calculates the trajectory of a projectile by computing 200 points for x, y and peak given initial velocity, angle and height.

The projectile Trajectory function is used to calculate the trajectory of a projectile, assuming ideal projectile motion (i.e., neglecting air resistance). This function computes 200 points for x, y, and peak based on the following inputs:

\(v_0\) = initial velocity, theta = angle of projection, \(y_0\) = initial height of the object.

The trajectory of the object is derived from basic physics and is given by the formula:

\(y = x * tan(theta) - (g * x^2) / (2 * v_0^2 * cos(theta)^2) + y_0\) where g is the acceleration due to gravity.

This formula is used to calculate the y-coordinate for each point along the x-axis. The maximum height of the trajectory (i.e., the peak) is also computed. The output of the function is x, y, and peak.

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Answer:

In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

Explanation:

Answer:

Electrons flow easily between metal nuclei :)

Explanation: