1. A skateboarder is skating over a circular bump. He is at the top of the bump and is
moving rightward. Is the normal force exerted on the skateboarder by the bump greater
than, less than, or equal to the weight of the skateboarder? Explain your reasoning.

A. The average drift speed of the electrons in the wire is  1.19 x \(10^{-3}\)cm/s.

B. The time it would take an electron to travel 8.84 m is 7.43 x \(10^{5}\)sec

(A) To find the average drift speed of electrons in a wire, we can use the equation:

I = nAvq

Where:
I is the current in Amperes
n is the electron density in electrons per \(cm^{3}\)
A is the cross-sectional area of the wire in \(cm^{2}\)
v is the average drift velocity of electrons in cm/s
q is the charge of an electron, which is 1.6 x \(10^{-19}\) Coulombs

First, we need to find the cross-sectional area of the wire. The formula for the area of a circle is:

A = π\(r^{2}\)

Where:
A is the area of the circle
r is the radius of the circle

Given that the wire diameter is 1.63 mm, we can find the radius by dividing it by 2:

r = 1.63 mm / 2 = 0.815 mm = 0.0815 cm

Now, we can calculate the area:

A = \(π(0.0815 cm)^{2}\) = 0.0209 \(cm^{2}\)

Next, we can rearrange the equation to solve for v:

v = I / (nAq)

Given that the current is 20 A and the electron density is 8.47 x \(10^{24}\)electrons per \(cm^{3}\), we can substitute these values into the equation:

v = 20 A / (8.47 x \(10^{24}\) electrons per cm^3 * 0.0209 cm^2 * 1.6 x \(10^{-19}\) C)

Simplifying the expression:

v = 1.19 x \(10^{-3}\) cm/s

Therefore, the average drift speed of electrons in the 14 gauge wire carrying a maximum current of 20 A is approximately 1.19 x \(10^{-3}\) cm/s.

(B) To calculate the time it would take for an electron to travel a distance of 8.84 m, we can use the formula:

t = d / v

Where:
t is the time in seconds
d is the distance in meters
v is the average drift velocity of electrons in meters per second

Given that the distance is 8.84 m and the average drift velocity is 1.19 x 10^-3 cm/s, we need to convert the velocity to meters per second:

v = 1.19 x \(10^{-3}\) cm/s * 0.01 m/cm = 1.19 x \(10^{-5}\) m/s

Now, we can substitute the values into the formula:

t = 8.84 m / 1.19 x \(10^{-5}\)m/s

Simplifying the expression:

t = 7.43 x \(10^{5}\)s

Therefore, it would take approximately 7.43 x \(10^{5}\) seconds for an electron to travel a distance of 8.84 m.

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so ummmm what about ?

because I cant see any actual question?

The calculate the total current through the circuit, we first need to understand the concept of series circuits.  Therefore, the total current through the circuit is 0.15 amps or 150 milliamps.

The four light bulbs are connected in series, which means that the current flowing through each bulb is the same. The total resistance of the circuit can be calculated by adding up the resistance of each bulb (10 ohms each) which gives us a total resistance of 40 ohms. Using Ohm's law, we can calculate the current flowing through the circuit by dividing the voltage of the battery (6.0 V) by the total resistance (40 ohms). This gives us a total current of 0.15 amps or 150 milliamps. Therefore, the total current through the circuit is 0.15 amps or 150 milliamps.

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Newton's laws of motion are referred to as "laws" because they are fundamental principles that describe the behavior of objects in motion.

While it is true that they may involve multiple variables and can be challenging to fully comprehend, they are considered "laws" because they provide a framework for understanding and predicting the motion of objects under various conditions.

The term "law" in the scientific context does not imply absolute truth or exactness. Instead, it signifies a well-established and widely accepted principle that has been extensively tested and validated through experimental observations and mathematical models. Newton's laws have been verified in countless experiments and have consistently demonstrated their predictive power in explaining the behavior of objects in motion.
Scientific understanding is an evolving process, and as new evidence or theories emerge, our understanding of these laws may be refined or expanded. However, the term "law" serves as a testament to their foundational importance and their significant contributions to the field of physics. It is through the study of these laws that we can continue to deepen our understanding of the physical world and make progress in scientific exploration and technological advancements.

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A- the potential between the cylinders is constant and equal to (2/4πε₀) ln(b/a). b- the electric field is constant and given by E(r) = -2/(4πε₀) [(1/a) - (1/b)] for a < r < b.

(a) To find the potential V(r) from r < b, we can use the formula for the potential due to a line charge:

V(r) = (λ/4πε₀) ln(r/r₀)

For r < a, the potential is simply V(r) = 0 since there is no charge. For a < r < b, the potential due to the inner cylinder is:

V₁(r) = (2/4πε₀) ln(r/a)

and the potential due to the outer cylinder is:

V₂(r) = (-2/4πε₀) ln(r/b)

Adding these two potentials, we get:

V(r) = V₁(r) + V₂(r) = (2/4πε₀) ln(r/a) - (2/4πε₀) ln(r/b) = (2/4πε₀) ln(b/a)

(b) To calculate the electric field at any point between the cylinders, we differentiate V(r) with respect to r:

E(r) = -dV/dr = -2/(4πε₀) [(1/a) - (1/b)]

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the complete question is:

On the axis of a long, hollow metal tube with radius b, a long metal cylinder with radius an is supported on an insulating stand. The inner cylinder has a positive charge per unit length of 2 and the outer cylinder has an equal negative charge per unit length.

a- Calculate the potential V(r) from rb using V=0 at r=a.

(b) To calculate the electric field between the cylinders at any point, a r b, differentiate V(r) with respect to r.

The distance between the 7th and the tenth second is 29.4 m.

We know that we can have to formulate the information that has been given here so as to obtain a proper progression and this would help us to get the common difference of the progression that we are looking at.

Now we know that the progression would look something like; 4.9, 14.7, 24.5 ....

We can see that this is an arithmetic progression that has a common difference of 9.8.

U7 = a + (n - 1)d

a = first term

n = Number of terms

d = common difference

U7 = 4.9 + (7 - 1) 9.8

= 63.7

U10 = 4.9 + (10 - 1) 9.8

U10 = 93.1

Between the 7th and 10th seconds, we have;

93.1 - 63.7

= 29.4 m

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Answer:

The table can be used to predict the properties of elements, even those that have not yet been discovered.  Columns (groups) and rows (periods) indicate elements that share similar characteristics. The table makes trends in element properties apparent and easy to understand. The table provides important information used to balance chemical equations. Atoms are important because they form the basic building blocks of all visible matter in the universe. There are 92 types of atoms that exist in nature, and other types of atoms can be made in the lab. The different types of atoms are called elements. Hydrogen, gold and iron are examples of elements comprised of unique types of a single kind of atom.

Explanation:

The least harmful form of ionizing radiation is considered to be low-energy X-rays. X-rays are a form of electromagnetic radiation with a higher frequency and energy than visible light.

They have sufficient energy to ionize atoms and molecules, but their low energy level means that they generally do not cause significant harm to living tissue. However, it is important to note that even low-energy X-rays can still be harmful if a person is exposed to a large dose of them. This is why it is important to limit exposure to ionizing radiation, including X-rays, by using protective measures such as lead shielding and keeping the exposure time as short as possible. In general, the harm from ionizing radiation is related to the energy of the radiation and the amount of exposure. Higher energy and higher dose levels are more harmful. So, it is always important to minimize exposure to ionizing radiation, regardless of the type.

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Answer

Explanation: R=p l/A , we are given specific resistance of aluminium in terms of silver.

Answer:

In order for a planet to form there must be a strong force present to hold the material together  and for that to happen a disk is to be formed in order for the dust cloud to enter into a phase of Quasi equilibrium in which the centrifugal force is equal to the gravitational force  thus providing for matter to bind together and  allow for it to be converted into planets.

The cloud will spin faster i-e as the size will go on decreasing the angular momentum will increase(reduction in radius) and it will start spinning faster.

Explanation:

The turntable's rotation angular velocity when the block reaches the outer edge is 5.578 rads⁻¹

The inertial moment of the turntable block = \(\frac{1}{2} mr^{2}\)

The inertial moment of the block = \(mr^{2}\)

According to the law of conservation of angular momentum, the total angular momentum of the system when the block is seated at the center and when the block is at the outside edge must be the same since no external torque operates on the system.

Additionally,

ω= 2\(\pi\)f, where f represents rpm, can be used to determine

ω= 2π×63/60 = 6.597

So, I*ω = I' * ω'

\([\frac{1}{2} 0.23 *(0.5)^{2} + 0.021* (0)^{2} ]6.597= [\frac{1}{2} 0.23 *(0.5)^{2} + 0.021* (0.5)^{2} ]\)*ω'

ω' = 5.578 rads⁻¹

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Answer:

a

Explanation:

As you add thermal energy the particles spread apart and are moving faster ..... a certain volume of water produces a much larger volume of steam as energy is added.....that is how steam engines work !

The direction of the current induced in the coil when the current in the wire increases is counterclockwise. The correct answer is B.

According to Lenz's Law, the direction of the induced current is such that it opposes the change in magnetic flux that caused it. In this case, the increase in current in the wire causes an increase in magnetic flux through the coil, so the induced current will be in the opposite direction to oppose this change.

According to the right-hand rule for electromagnetic induction, the induced current in the coil flows in a direction such that the magnetic field it produces opposes the increase in magnetic field around the wire.

Therefore, direction will be counterclockwise.

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The Balmer series is a set of emission spectral lines of the hydrogen atom that results from electron transitions from the n = 3 state to the n = 2 state.

The wavelengths of the first five lines of the Balmer series can be calculated using the Rydberg formula.

The formula can be written as:

1/λ = R(1/4 − 1/n²)

where,

R is the Rydberg constant,

n is the principal quantum number of the higher energy level,

λ is the wavelength of the emitted photon.

The first five lines of the Balmer series have n values of 3, 4, 5, 6, and 7.

Plugging these values into the Rydberg formula gives the following wavelengths:

Line 1 (n = 3 → 2): λ = 656.3 nm

Line 2 (n = 4 → 2): λ = 486.1 nm

Line 3 (n = 5 → 2): λ = 434.0 nm

Line 4 (n = 6 → 2): λ = 410.2 nm

Line 5 (n = 7 → 2): λ = 397.0 nm

The wavelengths of the first five lines of the Balmer series are in the visible part of the electromagnetic spectrum.

The wavelengths range from 656.3 nm (red) to 397.0 nm (violet).

Therefore, the first five lines of the Balmer series are part of the visible spectrum.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

mass = 15 kg

acceleration = 10 m/s²

Force = 15 × 10 = 150

We have the final answer as

Hope this helps you

Answer:

yes

Explanation:

Generally, darker colors dominate so a person with one brown-eyed gene and one blue-eyed gene will have brown eyes. The only way to present blue eyes is to inherit two copies of the blue-eyed gene. However, brown-eyed parents can pass a recessive blue-eyed gene. Therefore, two brown-eyed partners can birth a blue-eyed baby.

Answer:

The cat went up

Explanation:

The total number of significant digits in the given number is five. If the books are measured in packets of 10, the number of significant digits reduces to two.

The given data is: Total number of books in the library = 57,000. We are to determine how many significant digits are there in the result? For this, let us define what are significant digits: Digits that are used to communicate meaning or accuracy of measurements are known as significant digits. In other words, the digits that carry meaning contributing to its measurement uncertainty are called significant digits. It is used to determine the accuracy of the results. In this question, the total number of books in the library is given as 57,000. As there are five non-zero digits in the given number, there are five significant digits in the result. Will the result change if the books are measured in the packet of 10? If the number of books is measured in the packet of 10, then there will be a change in the number of significant digits. When we express 57,000 in the packet of 10, we get: 57,000 = 5.7 × 10^4. Now, there are only two significant digits in the result (5 and 7), and hence the result changes.

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Answer:

According to studies, the milky way is approximately, "170,000–200,000 light-years (52–61 kpc) in diameter and, on average, approximately 1,000 ly (0.3 kpc) thick."

With that being said, it is safe to say that the dimensions are somewhere around 100,000 by 1,000

This statement is FALSE, the visible surface of the sun is composed of solid matter.

The sun is made totally out of plasma, the fourth nation of depending after gasoline, liquid, and strong, and the most energetic. As you could consider, the sun is tremendously hot. It varies among nine,900-27,000,000°F in temperature among the “surface” (the outer limb of its environment where it becomes obvious to light as opposed to opaque), and the middle.  

Unlike the gasoline massive planets, which probably have a strong middle, the sun is made nearly out of hydrogen and helium, the lightest of all the elements, and at no point, internal should either of those exist as a solid at the one’s temperatures, despite the awesome pressures that exist in the solar. It’s plasma all the way down, even at the center where the density is ten instances that of gold.

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A. carry-over effects. In an ABAB reversal design, the second "B" period is necessary to rule out carry-over effects. Carry-over effects occur when the effects of the first treatment phase (A) persist into the second treatment phase (B), or when the effects of the second phase influence the third phase (A).

By including a second "B" phase, researchers can evaluate whether the effects observed in the first "B" phase were due to the treatment or to carry-over effects.

The ABAB reversal design is a type of single-subject experimental design that involves alternating between a baseline phase (A) and a treatment phase (B) to evaluate the effects of the treatment on the target behavior. By comparing the behavior during the treatment phase to the behavior during the baseline phase, researchers can determine whether the treatment is effective. However, without a second "B" phase, it may be difficult to determine whether any changes observed in the first "B" phase were due to the treatment or to other factors, such as carry-over effects. Therefore, the second "B" phase is necessary to establish the effectiveness of the treatment and rule out potential confounding factors.

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The maximum volume of water that can be poured into one of the branches is 2 cm² x 3.4 cm = 6.8 cm³.

Let's first find the volume of the mercury in the tube.

The height of the mercury in the tube is 6.8 cm. Since the cross-sectional area of the tube is uniform, the volume of the mercury is given by:

Volume of mercury = area of cross-section x height of mercury

= 2 cm² x 6.8 cm

= 13.6 cm³

Now, let's find the maximum volume of water that can be poured into one of the branches. We'll assume that all the mercury in that branch is pushed up to the top of the branch, and that the water is poured in until it reaches the same height.

Let's call the height of the water in the branch "h".

The volume of water in the branch is then given by:

The volume of water = area of cross-section x height of water

= 2 cm² x h

For the water to reach the same height as the mercury in the other branch, we need:

Volume of water = Volume of mercury

2 cm² x h = 13.6 cm³

Solving for h, we get:

h = 6.8 cm³ / 2 cm²

h = 3.4 cm

Therefore, the maximum volume of water that can be poured into one of the branches is 2 cm² x 3.4 cm = 6.8 cm³.

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Answer:

628 J  

Explanation:

Force of friction x distance = work

force of friction = normal force * coeff

                          =  ( 80 kg * 9.81 m/s^2) * .4 = 313.92 N

3139.2N  * 2 m  = 627.84  J  = ~ 628 J

46,756,790 mg = 46.75679 kg

5.6 hours = 20,160 seconds

13.5 cm = 5.315 inches

47 °F = 8.333 °C

To convert milligrams (mg) to kilograms (kg), we divide the value by 1,000,000 (since there are 1,000,000 milligrams in a kilogram). Therefore, 46,756,790 mg divided by 1,000,000 equals 46.75679 kg.

To convert hours to seconds, we multiply the value by 3,600 (since there are 3,600 seconds in an hour). Therefore, 5.6 hours multiplied by 3,600 equals 20,160 seconds.

To convert centimeters (cm) to inches, we divide the value by 2.54 (since there are 2.54 centimeters in an inch). Therefore, 13.5 cm divided by 2.54 equals 5.315 inches.

To convert Fahrenheit (°F) to Celsius (°C), we use the formula °C = 5/9 (°F - 32). Plugging in the value 47 °F into the formula, we get °C = 5/9 (47 - 32), which simplifies to °C = 5/9 (15) = 75/9 ≈ 8.333 °C.

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Answer:

The ways to change the total energy are to either make the hill taller to increase it or make the hill lower to decrease the total energy.

Explanation:

The total mechanical energy of a system is the sum of the total kinetic energy and total potential energy.

Answer: 12

Explanation:

The resultant vector is  12 unit.

When two vectors point in the same direction, their sum is equal to the total of their respective magnitudes pointing in the same direction.

When two vectors are pointed in opposite directions, the resultant vector is pointed in the direction of the larger vector and is equal to the difference between their magnitudes.

Here, one vector of 15 unit is acting to the left and another vector of 3 unit acting rightwards. As they are acting in opposite direction, vector summation of two vector will be equal to the value of subs traction of their magnitude.

So, Resultant vector= 15 unit + (-3 unit)

= 15 unit - 3 unit

= 12 unit.

Hence, the resultant vector will be 12 unit.

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Answer:

11m/s^2

Explanation:

Acceleration can be calculated by diving speed by time. Since we know speed and time, acceleration can be calculated.

55/5 = 11m/s^2

Answer:

Explanation:

Given:

A = 0.1 m²

F = 200 N

_________

p - ?

Pressure:

p = F / A

p = 200 / 0.1 = 2 000 Pa