Which equation should you use to solve this
problem? (Don't solve it, just pick the right
equation.)
A car traveling at 10 m/s accelerates 2 m/s²
until it's traveling at 20 m/s. How much time
did it take to reach the final velocity?
A) Delta*x = 1/2 * (v_{f} + v_{i}) * t
C) v_{f} ^ 2 = v_{i} ^ 2 + 2a*Delta*x
B) vf = Vi + at
D) Delta*x = v_{f}*t - 1/2 * a * t ^ 2

The steel string is stretched by 0.06 mm.

We can use Hooke's Law to find the amount of stretch in the steel string:

F = kΔL

where F is the tension force, k is the spring constant (related to the Young's modulus), and ΔL is the amount of stretch.

Rearranging the equation, we get:

ΔL = F / k

The spring constant k can be expressed as:

k = A * E / L

where A is the cross-sectional area of the string, E is Young's modulus, and L is the original length of the string.

Substituting the given values, we get:

A = \(πr^2 = π(0.5 mm)^2 = 0.785 mm^2\)

k = (π/4) * (1.0 mm)^2 * (20 × \(10^10 N/m^2\)) / (1.8 m) = 5.50 × \(10^4 N/m\)

Now we can find the amount of stretch:

ΔL = (3.3 × \(10^3 N)\)/ (5.50 × \(10^4 N/m\)) = 0.06 mm

Therefore, the steel string is stretched by 0.06 mm.

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The total distance traveled by Freddy would be 19 miles.

Freddy's total displacement would be 7 miles.

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard.

As given in the problem Freddy drives 4 miles east to his friend's house. He then travels 9 more miles east to the supermarket. Finally, on his way back home, he runs out of gas 6 miles after leaving the supermarket,

The total distance traveled by Freddy  = 4 miles + 9 miles + 6 miles

                                                                = 19 miles

The total displacement of the Freddy = final position of Freddy - initial position of Freddy

                                                            = 13 miles top east - 6 miles west

                                                            =7 miles

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Answer:

Explanation:

1. It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.

2. The nuclei and electrons of the atoms are attracted to each other

3. thermal energy

4. II and III only

5. It converts to thermal energy.

The centripetal acceleration of the disk spinning at 25.7 revolutions per second is 213.15 cm/s^2.

Angular velocity (ω) = 25.7 revolutions per second

we need to convert the units of Angular velocity to radians per second.

=25.7 revolutions per second × 2π radians per revolution

= 51.4π radians per second

Angular velocity (ω) = 51.4π radians per second

distance (r) = 8.2 cm

Centripetal acceleration (a) = ?

Centripetal acceleration = (angular velocity)^2 × radial distance

= 51.4 π ^2 ×  8.2

=  2.681π^2 × 8.2

= 2.681 × 3.1416^2 × 8.2

= 2.681 × 9.869 × 8.2

≈ 213.15 cm per second square

Therefore, the centripetal acceleration of a point 8.2 cm from the center of the disk is 213.15 cm/s^2.

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The question is-

A disk is spinning about its center at 25.7 revolutions per second. Find the centripetal accelerations of a point 8.2 cm from the center of the disk.

Answer:

the angle of incidence equals the angle of reflection

According to the law of reflection, the angle of incidence is equal to the angle of reflection.

What is Reflection ?

Reflection is the change of direction of the wave at the interface which separates two media. it get incident on the other media and get return to the same media is called as reflection. Common examples include the reflection of light, sound and water waves.

we can see that in the dark room when we incident light on the mirror, the direction of the light changes at the point of the incidence. in the scientific language we can say that light has reflected from the surface of the mirror. in this case  angle of incidence is always equal to angle of reflection. reflection is shown in the figure.

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Answer:

2850000J

Explanation:

Given parameters:

Weight of diver = 950N

Altitude  = 3000N

Unknown:

Total work done by the sky diver = ?

Solution:

To solve this problem, we use the expression:

        Work done  = Weight x height

Now insert the parameters:

        Work done  = 950 x 3000  = 2850000J

Answer:

1.6 m/s?

Explanation:

80 ÷ 50 = 1.6 m/s

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The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over. The test will begin on the word start. On your mark, get ready, start.

As a result, the transparent substance has a refractive index of roughly 1.54.

When light enters a substance like glass that has a higher refractive index than air, it moves more slowly. The light wobbles when viewed from the straight line. When light enters a medium with a lower refractive index, such as air from water, it moves more quickly.

It is possible to calculate the index of refraction (n) using Snell's law, which states that: n1 sinθ1 = n2 sinθ2

Since air is the first medium, the values given are n1 = 1.00, 1 = 39.9, and 2 = 15.7. We must locate n2.

To solve for n2 by rearranging Snell's law, we obtain:

n2 = n1 sinθ1 / sinθ2

Inputting the values provided yields:

n2 = 1.00 × sin 39.9◦ / sin 15.7◦

n2 ≈ 1.54

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Answer:

El equilibrio térmico se alcanzará a los 152ºC.

Explanation:

Dado que un ladrillo de 2kg que se encuentra a 200º c, se sumerge en 5 kg de agua a 32º, para determinar a qué temperatura se alcanza el equilibrio térmico se debe realizar el siguiente cálculo:

2+5 = 7

(200 x 5 + 32 x 2) / 7 = X

1064 / 7 = X

152 = X

Por lo tanto, el equilibrio térmico se alcanzará a los 152ºC.

I've attached a picture of the 3 electromagnets options below the main electromagnet.

Answer:

The third electromagnet is correct.

Explanation:

From the attached image, in the electromagnet above the 3, we can see that the positive terminal comes before the negative terminal at the bottom left.

Now, when it is reversed, they will both move to the bottom right but their position will change with the negative coming before the positive.

Also, the electric current arrow inside the circle points in the north west direction but when it is reversed, it will point in the north east direction.

Also, the winded coil over the pole remains the same.

Thus, the only option that fulfills this reversed positions is the 3rd electromagnet

Answer:

Explanation:

Its B and C, I got a 5/5 on my test with these answers.

Answer:

D

Explanation:

These all can impact the magnetic properties

Answer:

1.5 jouls for 1 coulomb

Explanation:

energy(U)=charge(q)*potential(V)

so U for 1 coulomb U=1*1.5=1.5 jouls

and for 1 electron U=(1.6*10^(-19))*1.5= 2.4*10^(-19) jouls

Answer:

Hydrochloric acid and sodium hydroxide interact, resulting in salt and a release of heat. As we can see, the result of the interaction of two highly aggressive compounds is table salt and water – compounds that are ultimately harmless, even beneficial, to human beings.

Explanation:

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Flow or displacement work refers to the work done by a system due to a volume change or displacement, typically in the context of a fluid or gas. Flow or displacement work is an important concept in thermodynamics because it is one of the ways in which energy can be transferred to or from a system.

The energy that is transported to or away from a system as a result of a force acting on it across a distance is referred to as work in thermodynamics. Work performed by a system as a result of a volume change or displacement is referred to as flow or displacement work, often in the context of a fluid or gas.

For instance, when a gas expands against a piston, it does so by displacing the gas volume and moving the piston outward. Similar to this, when a fluid flows through a pipe or a pump, it does so by applying force and shifting the fluid's volume.

The term "flow" or "displacement" refers to the displacement or flow of the substance that causes the work to be done in both situations.

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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:

7.36 j

Explanation:

PE = m g  h    so just mutiply the given values   .5 * 9.81 *1.5 = 7.36 j

  (assuming 1.5 is in meters)

Answer:

the reflected angle must be 20º

Explanation:

The surface on which the ray of light falls is a mirror, therefore the law of reflection must be fulfilled, which establishes that the incident angle is equal to the reflected angle.

Therefore, if the incident angle is 20º, the reflected angle must be 20º receiving the normal.

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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"Light year is a distance, not a speed. It's the distance light travels in one year, at the speed of 299,792,458 meters per second."

Nothing can move faster than 300,000 kph (186,000 miles per second). Only massless entities, like the photons that make up light, are able to move that quickly. Any material object cannot be propelled to the speed of light because it would need an infinite amount of energy to do so.

299,792,458 metres is the precise distance that light covers in a second when it is in a vacuum (983,571,056 feet). This is approximately 186,282 kilometres per second, or the mathematical symbol for light speed, 'c.'

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Answer:

They are made of one type of atom.

Explanation:

Answer:

The answer is A

Explanation:

It is not possible to add two vectors of unequal magnitudes and get a resultant vector with a magnitude of zero, but it is possible to add three vectors of equal magnitudes and get a resultant vector with a magnitude of zero when they form a closed triangle or polygon.

No, it is not possible to add two vectors of unequal magnitudes and get a resultant vector with a magnitude of zero. When adding vectors, their magnitudes contribute to the magnitude of the resultant vector. If the magnitudes are unequal, the resultant vector will have a magnitude that is not zero.

The magnitudes of the vectors determine the strength or intensity of their individual contributions to the resultant vector. In order for the magnitudes to cancel out and result in a zero magnitude, the vectors must have equal magnitudes and opposite directions.

On the other hand, it is possible to add three vectors of equal magnitudes and get a resultant vector with a magnitude of zero. This occurs when the three vectors form a closed triangle or polygon. Each vector can cancel out the contribution of the other two vectors, resulting in a net magnitude of zero for the resultant vector.

For this to happen, the vectors must have equal magnitudes and be arranged in such a way that their directions form a closed loop. This condition allows the vectors to completely offset each other, resulting in a resultant vector with zero magnitude.

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The Canada Day parade organized by the local government in Parksville, British Columbia would likely be classified as a public good.

The Canada Day parade organized by the local government in Parksville, British Columbia provides a valuable public service. It is a non-excludable and non-rivalrous good that can benefit all members of the community. As a non-excludable good, everyone is free to take part in the parade regardless of their ability to pay.

Similarly, it is a non-rivalrous good, which means that one person's consumption does not reduce the amount available for another. In this way, the Canada Day parade serves as an excellent example of a public good.

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When a solute is actively transported across epithelium, the usual follow-up is A) water movement in the opposite direction.

Active transport refers to the process in which substances, such as ions or molecules, are moved across a cell membrane against their concentration gradient, requiring the expenditure of energy. When solute is actively transported across an epithelium, it creates an osmotic gradient across the membrane.

Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration. In this case, since the solute is actively transported, it is being moved from an area of lower concentration to an area of higher concentration. As a result, water tends to move in the opposite direction, from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration).

Therefore, when a solute is actively transported across epithelium, the usual consequence is water movement in the opposite direction, as indicated by option A.

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Answer:

ultraviolet

Explanation:

 "ROY G BIV "

Red is coolest  violet is hottest