Jessica stretches her arms out 0.60 m from the center of her body while holding a 2.0 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
a. What is the combined angular momentum of the masses?
b. If she pulls her arms into 0.15 m, what is her new linear speed?

I'm really confused ab the explanations behind this. help, please

Answer:

Part A

The relationship between the circuit structure and the brightness of the bulb are;

The brightness of the bulb depends on the voltage to which the bulb is connected to

Bulbs connected in parallel, are connected directly to the voltage of the power source and are therefore brighter than bulbs arranged in series due to the reduced potential difference between bulbs in series and the voltage source

Part B

Given that bulbs are brighter when arranged in parallel, they require more energy to keep the bulbs lit than when they are arranged in series

Part C

The pros and cons of wiring bulbs in series and parallel are;

Series Circuits Disadvantage

i) A failure of one bulb arranged in series can lead to a failure of the circuit

ii) Bulbs arranged in series are not as bright as bulbs arranged in parallel

iii) When the number of bulbs arranged in a series are increased, the brightness decreases

iv) The bulbs cannot be controlled independently

Advantages of Series Circuits

i) Series circuits consume less energy and the batteries last longer when the attached bulbs are arranged in series

Disadvantage of bulbs arranged in parallel

i) The battery power quickly consumed

The Advantages of Bulbs in Parallel

i) The bulbs light brighter when they are in parallel

ii) The bulbs can be individually controlled

iii) The current can flow through more than one path way

iv) When one bulb fuses, the others in the circuit keep working

Explanation:

Answer:

the net force is 330N

Explanation:

Answer:

270N to the left

Explanation:

Since the 3 individual forces are all parallel to each other and effect the x-axis, you can add and subtract them to find the net force.

The three forces are:

200 N to the LEFT

300 N to the LEFT

230 N to the RIGHT

First, add up any multiples of forces with the same direction. Basically, add up all the forces going LEFT and all going RIGHT.

200 N + 300 N = 500 N LEFT

230 N RIGHT

In order to find resultant magnitude you must now subtract the larger force from the smaller force. The resultant direction will be in the direction of the larger force.

Magnitude of Net Force: 500 N - 230 N = 270 N

Net Force Direction: Direction of larger force: Direction of 500N force: LEFT

Mineralogically, barite is a sulfate, bornite is a sulfide, cuprite is an oxide, magnesite is a carbonate.

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Among the mineral groups, barite is a sulfide mineral, bornite is a sulfide mineral, cuprite is an oxide mineral, and magnesite is a carbonate mineral.

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The magnitude of the electric field between the parallel plates is approximately 4.07 N/C. The formula which can be used to calculate the size of the electric field between two parallel plates is:

Electric field (E) = Surface charge density (σ) / (ε₀)

The magnitude of the electric field between two parallel plates can be determined using the formula:

Electric field (E) = Surface charge density (σ) / (ε₀)
Where:
- Surface charge density (σ) is given as 36.0 nC/m²
- ε₀ is the permittivity of free space and has a value of 8.85 x 10⁻¹² C²/Nm²
To find the magnitude of the electric field, we need to substitute the given values into the formula:
E = 36.0 nC/m² / (8.85 x 10⁻¹² C²/Nm²)
Now let's calculate the value of E:
E = (36.0 x 10⁻⁹ C/m²) / (8.85 x 10⁻¹² C²/Nm²)
To simplify this calculation, we can divide the numerator and denominator by 10⁻¹²:
E = (36.0 / 8.85) N/C
Calculating this division:
E ≈ 4.07 N/C
Therefore, the magnitude of the electric field between the parallel plates is approximately 4.07 N/C.

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The magnitude of the acceleration is  −0.50 m/s² of the block of mass 290kg that slides on a frictionless plane inclined at 39◦ with the horizontal under the influence of a restraining force of 1643 .

The resulting motion is

2. up the plane, since the acceleration is negative.

Acceleration describes the speed and direction changes in velocity over time. Acceleration refers to the change in speed or direction of an object or point moving straight ahead.

Due to the constant change in direction, motion on a circle accelerates even when the speed is constant. Both effects help to accelerate all other types of motion.

We have given that,

m = 290 kg

θ = 39◦

F = 1643 N

g = 9.8 m/s²

The force due to gravity

F₁ = m × g × sinθ

F₁ = 290 × 9.8 × sin 39°

F₁ = 1790.46 N

Lets take acceleration is a m/s²

Form Newtons second law

F - F₁ = m × a

1643 - 1790.46 = 290 x a

a = −0.50 m/s²

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R(F) = 4F - 160

a. R¹(P) represents the temperature at which a cricket chirps at a rate of P chirps per minute.

b. R(60) refers to the chirping rate of the cricket when the temperature is 60 degrees Fahrenheit, while R¹(60) represents the temperature at which the cricket chirps at a rate of 60 chirps per minute.

The equation R(F) = 4F - 160 represents the relationship between the temperature of the cricket's environment (F) and its chirping rate (R). By plugging in different temperature values, we can determine the corresponding chirping rate.

For example, when we calculate R(60), we find the chirping rate at 60 degrees Fahrenheit.

In this case, R(60) = 4(60) - 160 = 240 - 160 = 80 chirps per minute.

On the other hand, when we calculate R¹(60), we are looking for the temperature at which the cricket chirps at a rate of 60 chirps per minute. Solving the equation 60 = 4F - 160, we find F = 70 degrees Fahrenheit. Therefore, R¹(60) = 70.

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Answer:

The correct option is D

Explanation:

This question can be better understood when discussed using the Newton's first law of motion which states that an object would continue to move with a uniform speed (in a straight line) unless acted upon by an external force. What happens here (in the question) is that the bike rider would have continued moving at a constant speed (to the right) if not for the opposing force of the wind that acted against her (to the left). This wind/force would cause her speed to reduce or slow down (as posited by the law).

Kinematics

First Velocity (Vf) = 18 m/s

Last Velocity (Vl) = 19 m/s

time (t) = 5 seconds

acceleration = ______?

Answer :

Vl = Vf + a × t

19 = 18 + a × 5

19 - 18 = 5a

1 = 5a

1 / 5 = a

0,2 m/s² = a ✅

Answer: 0.2 m/s^2 east

Explanation:

A PE X

Answer:

Friend will wait 5 minutes

Answer:

you're Friend will wait 5 minutes

Answer:

a = 5 m/s^2

Explanation:

The force is constant. The distance does not matter if there is no friction. This is an example of Newton's second law.

F = m * a

F = 10 N

m = 2 kg

a = ?

10 = 2 * a    Divide by 2

10/2 = a

a = 5 m/s^2 second from the bottom.

The net force on the middle charge due to the four other charges is zero.

The given parameters:

The magnitude of the force on the middle charge due to the four other charges is calculated as follows;

\(F_0{net} = F_{01} + F_{02} + F_{03} + F_{04}\\\\F_0{net} = \frac{k\times q_0(-q_1)}{r^2} + \frac{k\times q_0(q_2)}{r^2} + \frac{k\times q_0(q_3)}{r^2} + \frac{k\times q_0(-q_4)}{r^2}\\\\F_0{net} = - \frac{k\times q_0q_1}{r^2} + \frac{k\times q_0q_2}{r^2} + \frac{k\times q_0q_3}{r^2} - \frac{k\times q_0q_4}{r^2}\\\\F_0{net} = \frac{kq_0}{r^2} (-q_1 + q_2 + q_3 - q_4)\\\\recall, \ |q_1| = q_2 = |q_3| = |q_4| = 2 \ nC\\\\F_0{net} = \frac{kq_0}{r^2} (-2 + 2+ 2-2)\\\\F_0{net} = \frac{kq_0}{r^2}(0)\\\\\)

\(F_0{net} = 0\)

Thus, the net force on the middle charge due to the four other charges is zero.

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i. The change in the velocity of the car is 12 m/s

ii. The acceleration of the car is 0.2 m/s²

The change in the velocity of the car can be obtained as follow:

Change in velocity = Final velocity - initial velocity

= 32 - 20

= 12 m/s

The acceleration of the car can be obtained as illustrated below:

Acceleration = change in velocity / time

= 12 / 60

= 0.2 m/s²

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Shorter wavelengths correspond to greater density of the water, while longer wavelengths correspond to lesser density of the water.

A sound wave passing through regions of the ocean with varying density has an impact on the wavelengths of the sound waves. The corresponding relationship between the varying wavelengths and the density of the water is that shorter wavelengths correspond to greater density of the water, while longer wavelengths correspond to lesser density of the water.

For a proper understanding of the explanation above, it's important to note that sound waves passing through regions of the ocean with varying density experiences different conditions. The sound waves travel through the ocean medium which has different densities. When sound waves travel through denser water, it travels at a slower speed. Consequently, the wavelength shortens as it continues to travel through denser regions of the ocean. As the sound wave travels through regions of the ocean with lesser density, it travels at a faster speed. Hence, the wavelength elongates as it continues to travel through regions with lesser density

Shorter wavelengths correspond to greater density of the water, while longer wavelengths correspond to lesser density of the water.

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The equation that best represents the energy conversion during the process of the box compressing the spring is m(v₂² - v₁²) = kx².

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Based on the law of conservation of energy, the work done by the box is equal to the change in the kinetic energy of the box.

ΔK.E = W

¹/₂m(v₂² - v₁²) = ¹/₂kx²

m(v₂² - v₁²) = kx²

where;

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The reduction in the decibel level will be approximately 6.8 dB.

The intensity of sound is proportional to the square of the sound pressure level, which is measured in decibels (dB). The relationship between the intensity of sound and the sound pressure level is given by the following formula:

\(\dfrac{I_2} { I_1} = (\dfrac{P_2} { P_1})^2\)

where I₁ and I₂ are the initial and final sound intensities, and P₁ and P₂ are the initial and final sound pressure levels, respectively.

If one-third of the members of a symphony orchestra is absent due to head colds, the intensity of the sound will be reduced by a factor of (2/3)² = 4/9, or approximately 44.4%.

To calculate the reduction in the decibel level, we can use the following formula:

\(\Delta L = 10 log10(\dfrac{I_2} { I_1})\)

where ΔL is the change in sound pressure level in decibels.

Substituting the values, we get:

\(\Delta L = 10 log10(\dfrac{4}{9}) = -6.8 dB\)

Therefore, the reduction in the decibel level will be approximately 6.8 dB.

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Answer:

check the attachments for the solution

Answer:

(a) zero

lmk if im wrong :)

Answer:

zero

Explanation:

As the radius remains same every charge gets neutralized .

Hence net charge is zero

Sound is transmitted through gases, plasma or blood, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.

For example, when you flick the rim of a glass, the glass will vibrate imperceptibly. These vibrations move through the air and strike the ear drum of anyone within hearing range (click here to find out 'How Our Ears Hear'). In fact, these vibrations, or sound waves, can move through any medium: gas, liquid or solid.

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The statement that is true about the wavelength and frequency of the sound as it passes from air to rock is that the frequency remains the same, but the wavelength becomes shorter in rock than in air.

When a sound wave generated from a tuning fork of single frequency travels from air to rock, the frequency of the wave remains the same, but the wavelength changes.

The wavelength of a wave is directly proportional to the speed of the wave and inversely proportional to the frequency of the wave, as given by the equation:

wavelength = speed of sound / frequency

Since the speed of sound is higher in rock than in air, the wavelength of the sound wave will be shorter in rock than in air, as given by the equation above.

Therefore, the statement that is true about the wavelength and frequency of the sound as it passes from air to rock is that the frequency remains the same, but the wavelength becomes shorter in rock than in air.

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The correct answer is frequency.

The number of cycles or vibrations per unit of time is known as the frequency in a system undergoing simple harmonic motion. Frequency is a fundamental characteristic of oscillatory motion and is measured in hertz (Hz).In simple harmonic motion, an object oscillates back and forth around an equilibrium position, following a sinusoidal pattern. The frequency of the motion determines how quickly the object completes one full cycle or vibration.The relationship between frequency (f), period (T), and angular frequency (ω) in simple harmonic motion is as follows:

f = 1/T

ω = 2πf

Where T is the period, representing the time taken to complete one full cycle, and ω is the angular frequency, representing the rate of change of angle with respect to time.The frequency of a system in simple harmonic motion describes the number of cycles or vibrations completed by the object per unit of time. It is an important parameter that characterizes the oscillatory behavior of the system.

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The energy stored in the spring, with a force of 40 N and a spring constant of 80 N/m, is 10 Joules.

The energy stored in a spring can be calculated using the formula:

\(\begin{equation}E = \frac{1}{2} k x^2\)

Where:

E is the energy stored in the spring

k is the spring constant

x is the displacement of the spring from its equilibrium position

In this case, the force applied to the spring is 40 N and the spring constant is 80 N/m. We can calculate the displacement of the spring (x) using Hooke's Law:

F = k * x

Rearranging the equation, we get:

\(\begin{equation}x = \frac{F}{k}\)

Substituting the values:

\(\begin{equation}x = \frac{40\text{ N}}{80\text{ N/m}} = 0.5\text{ m}\)

Now, we can calculate the energy stored in the spring:

\(\begin{equation}E = \frac{1}{2} k x^2\)

\(E = (1/2) * 80 N/m * (0.5 m)^2\)

E = 0.5 * 80 N/m * 0.25 m²

E = 10 J

Therefore, the energy stored in the spring is 10 Joules.

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The required power with which it radiates electromagnetic waves is 1.80 W.

To find the power with which the solid iron sphere radiates electromagnetic waves, we can use the Stefan-Boltzmann law:

Power radiated = ε * σ * A * \(T^4\)

Given:

ε (emissivity) = 0.860

σ (Stefan-Boltzmann constant) = \(5.67*10^{-8} W/(m^2^.K^4)\)

Radius (r) = 2.00 cm = 0.02 m

Temperature (T) = 20°C = 293 K

First, calculate the surface area of the sphere:

\(A = 4\pi * r^2\)
   \(= 4\pi * (0.02 m)^2\)

Now, substitute the values into the formula to calculate the power radiated:

Power radiated \(= 0.860 * 5.67 * 10^{-8} * 4\pi * (0.02 )^2 * (293)^4\)

Power radiated = 1.80 W.

Thus, the required, power with which it radiates electromagnetic waves is 1.80 W.

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The correct answer is: wider fringes will be formed by increasing the distance between the slits (option d).

In the double-slit experiment with monochromatic light, the interference pattern is determined by the relative sizes and spacing of the slits. The interference pattern consists of alternating bright and dark fringes.

d) By increasing the distance between the slits:

Increasing the distance between the slits will result in wider fringes in the interference pattern. This is because a larger slit separation allows for a larger range of path length differences, leading to constructive and destructive interference occurring over a broader area.

Therefore, the correct answer is: wider fringes will be formed by increasing the distance between the slits (option d).

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Answer:

skip zone

Explanation:

After t = 4 seconds, ascertain the baseball's vx and vy horizontal and vertical speeds. Only the pressure applied on the object's vertical component—gravity—is recognized by us. This indicates that the perpendicular speed is unchanged.

A planet and maybe other bodies pull objects toward their centers through their gravitational force. The gravitational attraction of the sun keeps all of the planets in their orbit around it.

The size of an object and its distance from other things both have an impact on gravity. The mass of a thing is a gauge for its matter content. A heavier object will fall to the ground more quickly than a lighter one. Gravitational pull weakens when the separation between two objects grows.

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The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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Urine is a liquid by-product of metabolism in humans and in many other animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excreted from the body through the urethra.  

Urine is a liquid by-product of metabolism in humans and in many other animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excreted from the body through the urethra.  

this explanation assumes that the voltage source (battery) remains constant, and there are no other significant changes in the circuit's configuration or other factors affecting the flow of current.

When you close a switch in a circuit, you are essentially creating a new pathway for current to flow. By adding another resistance in the circuit, you might intuitively think that the total current flowing from the battery would decrease. However, this is not always the case, and the behavior depends on the specific configuration of the circuit.

To understand why the total current can increase, despite adding another resistance, it's important to consider the overall resistance of the circuit and how it impacts the flow of current.

In a simple series circuit, where resistors are connected in a sequence, the total resistance (R_total) can be calculated by summing up the individual resistances (R1, R2, R3, and so on) in the circuit:

R_total = R1 + R2 + R3 + ...

According to Ohm's Law (V = IR), the current (I) flowing in a circuit is directly proportional to the voltage (V) applied across the circuit and inversely proportional to the total resistance (R_total):

I = V / R_total

When you add another resistor (increasing the total resistance) but maintain the same voltage, the current can still increase if the change in resistance is relatively smaller compared to the total resistance. This could happen if the newly added resistor has a significantly smaller resistance compared to the existing resistors in the circuit.

In such cases, the increase in the total resistance might be overshadowed by the decrease in the equivalent resistance of the circuit due to the additional resistor. As a result, the total current can increase since the resistance has decreased more than the increase caused by the newly added resistor.

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