A car slows down at -5.00m/s^2 until it comes to a stop after traveling 15.0m. What was the initial speed of the car?

Answer:

(A)²

Explanation:

Atomic mass = density*volume of atom.

So, density of nucleus is in depend of mass number

d=

3

4

πr

3

Massno.

=

3

4

π×[1.3×10

−13

×A

1/3

]

3

A

=constant∗A

0

as R=R

0

A

1/3

(R

0

=1.1×10

−15

m)

The numerical value of the density of a nucleus of atomic number A is determined as 2.29 x 10¹⁷ kg/m³.

The density of the nucleus of atomic number A​ is calculated as follows;

ρ = m/V

where;

[tex]\rho = \frac{m}{V} \\\\\rho = \frac{m}{\frac{4}{3} \pi r^3} \\\\\rho = \frac{1.66 \times 10^{-27}}{\frac{4}{3} \pi (1.2 \times 10^{-15})^3} \\\\\rho = 2.29 \times 10^{17} \ kg/m^3[/tex]

Thus, the numerical value of the density of a nucleus of atomic number A is determined as 2.29 x 10¹⁷ kg/m³.

The complete question is below:

​find the numerical value of the density of a nucleus of atomic number A​ with a radius of  1.2 x 10⁻¹⁵ m and mass of 1.66 x 10⁻²⁷ kg.

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The statement of the total mass after the reaction is "the same."

When one or more chemicals are transformed into one or more other compounds, a chemical reaction occurs.

A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass.

The principle which implies that the mass of matter in a closed system will remain constant regardless of the type of change that occurs. The amount of mass will not change whether it is due to a change in condition, dissolving, a chemical reaction, or any combination of these. Because the number of each type of atom remains constant, the mass will remain constant.

Hence the correct answer is A.

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The one option that specifically connects to an environment is option D: Global warming melting summer ice floes in the Arctic. All of the other alternatives have the potential to harm ecosystems.

The Arctic ecology may be significantly impacted by the melting of summer ice floes as a result of global warming. Many species, including polar bears, seals, walruses, and other bird species, are dependent on the ice for their existence in the Arctic environment since it has been specially adapted to the presence of sea ice.

The habitats and food sources of these animals are disrupted as the ice floes melt. It may result in fewer hunting areas being accessible, change marine animals' reproductive cycles, and have an effect on the entire food chain in the Arctic ecosystem.

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Answer:

D. Global warming melting summer ice floes in the arctic

Explanation:

In a circuit, when the two conductors leading from the power source touch metal-to-metal, this is called a short circuit

There are two types of short circuits, short-to-power and short-to-ground, where electricity takes an unintentional shortcut without going through the intended sensor or actuator.

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The diagram for the standing wave after the tension is quadrupled while the frequency is held constant has been attached and explained below.

We already know that the frequency of a standing wave is given by,

= f = nv/2l

and

= v = [tex]\sqrt{\frac{T}{m} }[/tex]

In the given problem, the frequency of the wave after the tension is quadrupled will be -

= f2 = 2v/2l

= f2 = v/l

= f2 = 1/l  [tex]\sqrt{\frac{T}{m} }[/tex]

Now, since we have quadrupled the tension, we have -

= f = 1/l  [tex]\sqrt{\frac{4T}{m} }[/tex]

= f = 2(f2)

So, now we know that the final frequency will be of this form(the image has been attached here) and it would look like this if the tension is quadrupled while the frequency is held constant.

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The missing value is D. 98

The table provides information about the speed (m/s), frequency (Hz), and wavelength (m) of a sound wave generated by a musical note, in different mediums (air, glass, and brass). The frequency of the sound wave is constant across the three mediums, but the speed and wavelength will vary depending on the medium. Since we know the frequency and wavelength, we can use the formula:

Speed = Frequency x Wavelength

to find the missing value of the speed of the sound wave in brass.

4,700 = 55 x Wavelength

Wavelength = 4,700/55 = 85.818...

So the missing value is 98 (approximately) in the table.

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Answer:

34.55 m/s

Explanation:

The magnitude of the point charge is 12.03 × 10⁻¹² C and the electric field at 15.0m is 4.63 × 10⁻² N/C.

A point charge creates a 16,000 N/C electric field at a distance equal to 0.260 m.

E = 16,000 N/C

r = 0.260 m

k = 8.99 × 10⁹

To calculate the point charge,

E = kq/r²

16000 = 8.99 × 10⁹ × q / (0.26)²  

q = 16000 × 0.0676 / 8.99 × 10⁹

q = 10816 / 8.99 × 10⁹

q = 12.03 × 10⁻¹² C

When r= 15.0 m

E = kq/r²

E =  8.99 × 10⁹ × 12.03 × 10⁻¹² / (15)²

E = 0.4630 × 10⁻³

E = 4.63 × 10⁻² N/C

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The characteristics which I would suggest are the planet should be dense, solid and located near star.

All the eight planets of the solar system move around the sun in fixed paths. These paths are elongated. They are called orbits. Mercury is nearest to the sun. It takes only about 88 days to complete one round along its orbit.

Venus is considered as ‘Earth’s-twin’ because its size and shape are very much similar to that of the earth.

Till recently (August 2006), Pluto was also considered a planet. However, in a meeting of the International Astronomical Union, a decision was taken that Pluto like other celestial objects (Ceres, 2003 UB313) discovered in recent past may be called ‘dwarf planets.

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'What did you find most challenging about mastering this skill?'

Ahh- What I found most challenging about the passing skill is hitting the ball the right direction. The last time I tried to pass the ball it hit someone in the face. But when I got a hang of it, It was easy until middle game. I tried to hit the ball and I faceplanted into the bar..-

'What did you find easiest about mastering this skill?'

The easiest? Well for me, nothing was easy. I couldn't even serve the ball without hitting it thw wrong direction!! I can't serve or pass a ball without it going the wrong direction or the ball hitting someone in the face! It gotten easier and easier as the game went particuallarly well. My team did end up winning thanks to one of my teammates. I can't play volleyball well at all. It was easy in some cases but hard at the same time.

Hope this helps you! :)

Answer:

Explanation:

This is not exactly Physics but here you go:

What did you find most challenging about mastering this skill? Why?

Setting is the most challenging because it requires many different techniques. There is a designated setter in competition games exactly because it is the most challenging position. It also requires lot of practices with your teammates.

What did you find easiest about mastering this skill? Why?

Serving is the easiest because you literally have the ball in your hand when you serve. Now it is not as easy if you want to make a serve that is difficult to receive. When a player fails to serve, it is usually not because it is tough but rather the player is trying to make a hard or spinning serve.

I am not particularly athletic and above is from a little play time I have had with volley ball in high school.

Answer:

13 m/s

Explanation:

The computation of the final velocity is shown below;

We know that

v^2 = u^2 + 2as

Here v represent the final velocity

u denotes the initial velocity

a denotes the acceleration

And, s denotes the displacement

So, the final velocity is  

v^2 = (5)^2 + 2(8)(9)

= sqrt(25 + 144)

= sqrt(169)

= 13 m/s

The copper wire a better conductor of electricity than carbon fiber because copper (Cu) is a metal, and only metals can conduct electricity option - B is correct answer.

A metal has greater electrical conductivity the lower its resistivity level. And copper wire is an excellent electrical conductor because it has a low level of resistivity. Incredibly flexible is another quality of copper.

Carbon fiber still does not conduct electricity as well as metal, even after being treated with other materials. Though still about 100 times faster than carbon fiber treated with good electricity conductors, metals like silver, aluminum, and copper are particularly good at conducting electricity.

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Answer:

1. The electrons in copper (Cu) are loosely bound to the nucleus. (C.)

2. An electrical current that flows in one direction (D.)

3. aluminum (Al) (D.)

4. Opposite charges attract one another. (D.)

5. Atoms with a nearly empty valence shell make good conductors. (C.)

Explanation:

I did the Connections Academy test (Conductors and Insulators Quick Check)

Answer: point D

Explanation:

The static friction and the normal force are related to each other as ≤.

Static friction is a force that prevents an item from moving. The friction encountered when persons attempt to move a stationary object on a surface without actually causing any relative motion between the body and the surface on which it is located. Static friction occurs between two fixed things, whereas kinetic friction occurs when two items move. Static friction varies while kinetic friction remains constant.

The normal force is the force exerted by surfaces to prevent solid objects from passing through them. A contact force is normal force. According to Newton's third law, this force on the platform must be followed by an equal and opposite force delivered to the man by the platform. This force is identical to the normal force.

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Our days would be a little bit shorter, and as a result, the sun would rise and set each day at later and later hours.

Another method to determine how long a day is is to time how long it takes a planet to complete one full spin. A sidereal day is what is being described here. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes long. The sidereal day occurs after every 360-degree rotation of the Earth. It takes 23 hours, 56 minutes to do that. When Earth rotates slightly more and the sun is at the same location in the sky as it was 24 hours earlier, the solar day—the one that people count in the calendar—occurs.

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The time it takes for the mass to reach the new equilibrium position is approximately 0.15 seconds.

To calculate the time it takes for the mass to reach the new equilibrium position, you will need to know the spring constant of the spring. The spring constant, denoted by the letter k, is a measure of the spring's stiffness, and it is related to the force required to stretch the spring by a certain distance. If the spring constant is not given, it can not be calculated.

Once you have the spring constant, you can use the equation:

T = 2π √(m/k) where,

The spring constant (k) can be found by using the equation:

F = kx where,

In this case, the force is equal to the weight of the mass, which is m*g, where m is the mass and g is the acceleration due to gravity.

mg = kx

or, k = (m*g)/x

or, k = (1.65 kg * 9.8 m/s^2) / 0.215 m = 74.65 kg/s^2

Now that we know the spring constant, we can use the equation:

T = 2π √(m/k)

To find the time it takes for the mass to reach the new equilibrium position, where T is the period of oscillation, m is the mass of the object attached to the spring, and k is the spring constant.

T = 2π √(1.65 kg / 74.65 kg/s^2) = 0.15 sec

So the time it takes for the mass to reach the new equilibrium position is approximately 0.15 seconds.

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The force exerted on the rope by the ceiling is in the vertical direction. This means that the force is pushing straight down on the rope and is perpendicular to the plane of the ceiling.

The force exerted on the rope by the ceiling is the result of the gravity of the rope itself and the weight of any objects or materials that are attached to the rope.

In order for the force to remain in the vertical direction, the rope must be secured at the top of the ceiling and not allowed to move in any other direction. If the rope were to move in any other direction, the force exerted on the rope by the ceiling would no longer be in the vertical direction and the rope would no longer remain secure.

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The electron feels a force upward as it passes between the charged plates and narrowly avoids striking the top plate. It just misses the to plate by a small amount as it moves higher.

The proton will accelerate less and miss the plates since it is more massive. We once more utilise the kinematic equation to determine the vertical displacement when it occurs for the plates.

y=1/2at²=1/2eE/mp(1.25×10-8s)

² \s=2.73×10-6m

As stated in (b), the proton won't collide with one of the plates because, despite the fact that the electric force felt by the proton and the electrons is identical, the electric force produces a smaller acceleration than g, making it plausible to disregard gravity.

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Answer:

I finish that module I'm sure it's D

The fall of the ramp can be calculated by the falling style of the ramp. like if the ramp is falling in the rolling motion, then we can calculate the fall of the ramp by the process by which we calculate of the rolling motion of any object.

Rolling motion happens when an object roll over from a ramp or any other sloppy surface whether it is rough or smooth. many forces act on it at the same moment. also in many forces rolling tangential force and gravitational force is also acting on it at the same moment. in which the gravitational force is acting on it at a bigger pace and plays an important role in rolling of the object from the ramp or any other sloppy surface. hence, by this information we can firmly consider that a heavier object go down a ramp at a same pace as a lighter object go down a ramp because of gravitational force acting on it in a major form.

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Answer:

The action of rotating around something like for ex.. Child A stands in the middle of a room while Child B goes around Child A, Child B is rotating around Child A. Another ex. is; The earth rotates around the sun every 365 days the earth is rotating or going around the sun in a circle. So rotating to me is the act of rotating around something in any way shape or form.

PS: A middle schooler answered this so if you don't wanna believe me or think I'm wrong because I am younger you do you.

In the above situation the net torque on wire 2 due to wire 1 is Zero.

Fleming's left-hand rule identifies the force's direction on a current-carrying wire when it is placed in a magnetic field. It always runs counter to how the magnetic field and electric current are moving.

Torque is a vector quantity by definition. The direction is determined as part of the torque computation. The direction is parallel to both the force and the radius from the axis. It is customary to choose it along the rotational axis in the right-hand rule direction.

a force that is applied that results in a positive counterclockwise torque A negative torque rotates an object in a clockwise direction.

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Solar energy is called renewable because it is abundant in nature and can be filled repeatedly.

Energy is power or strength that can be used for various activities. Energy cannot be created but can be changed from one form to another and can be transferred.

Solar energy is energy produced from the radiant heat of sunlight that can be utilized by all living things on earth, both humans, animals and plants. Solar energy can also be used as an alternative energy because it is environmentally friendly. This energy is included in renewable energy because the amount is abundant and endless even though it is used in large quantities.

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A baseball player throws a ball which has a certain change in momentum. The magnitude of the net force on the ball is 72.22 N.

Given that,

Change in momentum Δp = 6.5 kg m/s

Time t = 90 ms = 90 × 10⁻³ s

Change in momentum can be written as,

Δp = m Δv = F×t

As we need net force on the ball,

Δp = F×t

Making F as subject and putting the values we have,

F = Δp/t = 6.5/(90 × 10⁻³) = 72.22 N

Thus, the required net force on the ball is calculated to be 72.22 N.

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The spring constant with given length that stretches upto certain length and has specified mass has a spring constant that is calculated to be 147 N/m.

Given that,

Initial length of the spring = 0.400 m

Final length of the spring = 0.450 m

Change in length, Δx = 0.450 m - 0.400 m = 0.050 m

Mass of the hung object = 0.750 kg

Weight of the hung object, w = 0.750 × 9.8 N = 7.35 N

From Hooke's law it is said that, mathematically

Spring constant = Weight of the hung object/ change in length

Putting in the above given values into the equation, we have,

Spring constant = 7.35/0.050 = 147 N/m

The required spring constant is calculated to be 147 N/m.

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For the circuit shown in the figure, 0.071 A is the current through resistor R1.

What is circuit ?
Circuit is an electrical network consisting of interconnected components that allow electricity to flow through it. It is used to control, regulate, and direct the flow of electricity in order to perform a specific task. A circuit is composed of wires, resistors, transistors, capacitors, and other components which are connected together in order to form a complete system. This system can be used to control a variety of electrical devices, such as lights, motors, and computers. Circuits can be used to create a wide range of applications, from simple household appliances to complex industrial machines.

The current through R1 can be calculated using Ohm's Law:

I = V/R = (9V)/(120Ω) = 0.075 A

Therefore, the answer is A) 0.071 A.

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The magnitude of the net displacement for the day depends on the total distance traveled and the direction in which traveled.

What do you mean by Magnitude?

Magnitude is a measure of the size or intensity of a physical quantity. It is typically expressed in terms of a numerical value and a unit. Examples of physical quantities with magnitude include speed, acceleration, force, energy, pressure, and power. Magnitude is a measure of the size or intensity of a physical quantity, and is typically expressed in terms of a numerical value and a unit.

Step 1: Find the resultant displacement vector by adding the vectors.

S total = S morning + S afternoon

= (2100 m , east) + (3000 m north) + (200 m , vertical) + (1400 m , west) + (2900 m , north) - (400 m , vertical)

Step 2: Simplify the vector.

S total = (700 m , east) + (5900 m , north) - (200 m , vertical)

Step 3: Calculate the magnitude of the resultant vector.

|S total | = √(700 m)^2 + (5900 m)^2 + (-200 m)^2

|S total | = √(490000 m^2 + 348400 m^2 + 40000 m^2)

|S total | = √(882400 m^2)

|S total | = 939.4 m

Hence, the magnitude of the net displacement is 939.4 m.

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Answer:

b is your answer

Explanation:

Answer:

C

Explanation:

Group one elements share common characteristics. They are all soft, silver metals. Due to their low ionization energy, these metals have low melting points and are highly reactive. The reactivity of this family increases as you move down the table.

The period of the child's motion is 3.171 seconds. The frequency of the vibration is 0.315 Hz.

The time period is 3.171 seconds.

2 × [tex]\pi[/tex] [tex]\frac{L}{g} ^{\frac{1}{2} }[/tex]

= 3.171 seconds

The frequency is the reciprocal of the time period.

f = 1 ÷ 3.171

= 0.315Hz

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Answer:

Weight of a 35kg object on Earth is 350N, while it is 56N on the Moon.

Explanation:

The conversion of mass (kg) to weight (N) on Earth is 1kg to 10N.
Thus, the weight of a 35kg mass on Earth is
35kg × 10 = 350N

On the Moon, conversion of mass to weight is 1kg to 1.6N.
Thus, the weight of a 35kg mass on the Moon is
35kg × 1.6 = 56N

Remember, mass remains constant regardless of location, while weight depends on the strength of the gravitational field.