As an ice skater begins a spin, his angular speed is 3.34 rad/s. after pulling in his arms, his angular speed increases to 5.44 rad/s.
Find the rasio of the skater's final moment of inertia to his initial moment of inertia.

A. The voice of a singer will be heard first by someone in the balcony 47.0m away from the stage. (B) The person on the balcony will hear the sound 3498.9878 s before the person sitting next to the radio at home.

The team discovered that sound can travel at its fastest at 36 km (22.4 mi) per second. That's more than 100 times faster than its average speed through air (343 m (1,125 ft) per second) and three times faster than its previously measured top speed through diamond (12 km (7.5 mi) per second).

To calculate the time difference,

we need to find the time taken by sound to travel a distance of 1200 km and 47 m.

Using the formula for the speed of sound  v = d/t where, v = speed of sound = 343 m/s t = time taken by sound to travel a distance of d.

d = 1200000 m

t = d/v=1200000/343

 =3499.125 s

For a person in the balcony, d = 47 m

t = d/v=47/343=0.1372 s

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The current density in the hollow copper wire is approximately 2.09 × 10⁶ A/m².

To calculate the current density in the hollow copper wire, we'll first need to determine the cross-sectional area of the wire. Given the inner diameter of 1.2 mm and outer diameter of 2.5 mm, we can find the area as follows:
1. Convert diameters to radii: inner radius (r1) = 0.6 mm, outer radius (r2) = 1.25 mm
2. Convert radii to meters: r1 = 0.0006 m, r2 = 0.00125 m
3. Calculate the cross-sectional area: Area = π(r2² - r1²)
Area = π((0.00125)² - (0.0006)²) = 3.82116 × 10⁻⁶ m²
Now we can find the current density (J) using the formula J = I/Area, where I is the current (8.0 A) and Area is the cross-sectional area calculated above.
J = 8.0 A / 3.82116 × 10⁻⁶ m² ≈ 2.09 × 10⁶ A/m²

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a. The energy consumed over the one-year period is 438 kWh.

b. The utility energy charges for this period at a rate of $0.12/kWh is $52.56.

a. To determine the energy consumed over the one-year period, we first need to calculate the energy consumption per day.

The compact fluorescent lamp has a power rating of 23 W, which is equivalent to a 100 W incandescent lamp. Therefore, we can assume that it consumes the same amount of energy as a 100 W incandescent lamp.

Energy consumption per day = Power x Time
= 100 W x 12 hours
= 1200 Wh

Now, we need to convert this to kilowatt-hours (kWh) as that is the unit of measurement used in utility energy charges.

Energy consumption per day = 1200 Wh ÷ 1000
= 1.2 kWh

Energy consumption over one year = Energy consumption per day x 365 days
= 1.2 kWh/day x 365 days
= 438 kWh

Therefore, the energy consumed over the one-year period is 438 kWh.

b. To calculate the utility energy charges for this period at a rate of $0.12/kWh, we simply need to multiply the energy consumed by the rate.

Utility energy charges = Energy consumed x Rate
= 438 kWh x $0.12/kWh
= $52.56

Therefore, the utility energy charges for this period at a rate of $0.12/kWh is $52.56.

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The magnitude of the magnetic force that acts on a 3.17 m length of either wire of two long parallel wires that are separated by 1.99 cm and carrying currents of 2.17 A is 1.50 × 10⁻⁴ N.

To find the magnitude of the magnetic force acting on a 3.17-meter length of either wire carrying currents of 2.17 A and separated by 1.99 cm, follow these steps:

1. First, convert the separation distance between the two parallel wires to meters. 1.99 cm = 0.0199 m.

2. Using the formula for the magnetic force between two parallel wires:

[tex]F = \frac{(\mu _o I_1  I_2  L)} { (2  \pi  d)}[/tex]

where F is the magnetic force, μ₀ is the permeability of free space (4π × 10⁻⁷ Tm/A), I₁ and I₂ are the currents in the wires, L is the length of the wire, and d is the distance between the wires.

3. Plug the given values into the formula:

[tex]F = \frac{((4\pi  \times 10^{-7} \ Tm/A) \times 2.17 \ A \times 2.17 \ A \times 3.17 \ m)}{ 2 \times \pi \times 0.0199 \ m)}[/tex].

4. Simplify and calculate the magnetic force: F = 1.50 × 10⁻⁴ N.

Therefore, the magnitude of the magnetic force that acts on a 3.17-m length of either parallel wire is 1.50 × 10⁻⁴ N.

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(a) The average intensity of the light bulb at a distance of 3.00 m is approximately 0.98 [tex]mW/m^2[/tex]. (b) average intensity of the light bulb at a distance of 47.4 m is approximately 0.0039 [tex]mW/m^2[/tex].

To find the average intensity of the light bulb at a distance of 3.00 m, we can use the formula: [tex]I = P/4πr^2[/tex] where I is the intensity in watts per square meter, P is the power of the bulb in watts, and r is the distance from the bulb in meters.

Substituting the given values, we get: [tex]I = 28/4π(3.00)^2[/tex] I ≈ [tex]0.98 mW/m^2[/tex]Therefore, the average intensity of the light bulb at a distance of 3.00 m is approximately 0.98[tex]mW/m^2.[/tex]

Similarly, to find the average intensity of the light bulb at a distance of 47.4 m, we can use the same formula:[tex]I = P/4πr^2[/tex] Substituting the given values, we get:[tex]I = 28/4π(47.4)^2 I ≈ 0.0039 mW/m^2[/tex].

Therefore, the average intensity of the light bulb at a distance of 47.4 m is approximately 0.0039 [tex]mW/m^2[/tex].

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Answer:

Work = 300 J

Explanation:

[tex]W = Force*distance\\W = 20*15\\W = 300 J[/tex]

Coil has an area of .196 m² and carries a current of 7.18 a around it. this results in a magnetic moment of 2.28×10³ there are approximately 64.6 turns of wire that wrap around this coil.

To find the number of turns of wire that wrap around the coil, we can use the formula for magnetic moment:
Magnetic moment = current ×area ×number of turns
We are given the current and area of the coil, as well as the magnetic moment. So we can rearrange the formula to solve for the number of turns:
Number of turns = magnetic moment / (current ×area)
Plugging in the given values, we get:
Number of turns = (2.28×10³ a m²) / (7.18 a ×0.196 m²)
Number of turns = 64.6
Therefore, there are approximately 64.6 turns of wire that wrap around this coil.

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To apply Kirchhoff's junction rule at point a, we need to consider the currents entering and leaving the junction.

Let's assume the currents through the resistors are I1, I2, and I3, where:

I1 is the current through the 20Ω resistor,
I2 is the current through the 0.50Ω resistor,
I3 is the current through the 40Ω resistor.

According to Kirchhoff's junction rule, the sum of currents entering the junction equals the sum of currents leaving the junction. In this case, at point a:

I1 + I2 = I3

This is the equation you get when applying Kirchhoff's junction rule at point a. Remember, this rule is based on the principle of conservation of charge, meaning that no charge is lost or gained at the junction.

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To calculate the acceleration of the skier, we can use the formula a = gsinθ - μkcosθ, where g is the acceleration due to gravity (9.8 m/s^2), θ is the angle of the slope (10.0 deg), and μk is the coefficient of kinetic friction (0.1).

Plugging in the values, we get:
a = (9.8 m/s^2)(sin 10.0) - (0.1)(cos 10.0)
a = 1.67 m/s^2

Therefore, the acceleration of the skier is 1.67 m/s^2.

To find the angle of the slope down which the skier could coast at a constant velocity, we can use the formula μk = tanθ, where μk is the coefficient of kinetic friction. Solving for θ, we get:

θ = tan^-1(μk)
θ = tan^-1(0.1)
θ = 5.74 deg

Therefore, the skier could coast at a constant velocity down a slope with an angle of 5.74 deg or less, assuming the coefficient of friction for waxed wood on wet snow.

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To calculate the acceleration of the skier, we can use the formula a = gsinθ - μkcosθ, where g is the acceleration due to gravity (9.8 m/s^2), θ is the angle of the slope (10.0 deg), and μk is the coefficient of kinetic friction (0.1).

Plugging in the values, we get:
a = (9.8 m/s^2)(sin 10.0) - (0.1)(cos 10.0)
a = 1.67 m/s^2

Therefore, the acceleration of the skier is 1.67 m/s^2.

To find the angle of the slope down which the skier could coast at a constant velocity, we can use the formula μk = tanθ, where μk is the coefficient of kinetic friction. Solving for θ, we get:

θ = tan^-1(μk)
θ = tan^-1(0.1)
θ = 5.74 deg

Therefore, the skier could coast at a constant velocity down a slope with an angle of 5.74 deg or less, assuming the coefficient of friction for waxed wood on wet snow.

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The given flow is turbulent and the maximum velocity of laminar flow is 0.64 m/s

1. To determine if the flow is laminar or turbulent, we can use the Reynolds number formula:

Re = (ρVD)/μ

Where:
ρ = density of fluid
V = velocity of fluid
D = diameter of pipe
μ = dynamic viscosity of fluid

Plugging in the values given, we get:

Re = (1000 kg/m3)(5.5 m/s)(0.15 m)/(0.001 kg/m.s) = 90750

If the Reynolds number is less than 2300, the flow is laminar. If it is greater than 4000, the flow is turbulent. If it is between 2300 and 4000, the flow may be laminar or turbulent depending on other factors.

In this case, the Reynolds number is greater than 4000, so the flow is turbulent.

2. To maintain laminar flow, the Reynolds number should be less than 2300. We can rearrange the Reynolds number formula to solve for the maximum velocity:

Vmax = (Reμ)/(ρD)

Plugging in the values given, we get:

Vmax = (2300)(0.05 Pa.s)/(900 kg/m3)(0.2 m) = 0.64 m/s

Therefore, the maximum velocity to maintain laminar flow in this pipe is 0.64 m/s.

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In an electromagnetic field with a max magnetic field magnitude of 5.00x10-4 T, the maximum strength of the electric field is 1.67 pV/m.

Electromagnetic forces exist between any two cosmic rays, causing attraction between particles of opposite charges or repulsion between particles of the same charge, whereas magnetism is a contact that occurs only between energetic ions in relative motion.

Michael Provides proof that the assessment 22 September 1791 – 25 August 1867 is best remembered for the discovery of magnetic flux, contributions to electromagnetics and electrochemistry, or for being the person who introduced the concept of field in quantum mechanics to describe electric force.

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In an electromagnetic field with a max magnetic field magnitude of 5.00x10-4 T, the maximum strength of the electric field is 1.67 pV/m.

Electromagnetic forces exist between any two cosmic rays, causing attraction between particles of opposite charges or repulsion between particles of the same charge, whereas magnetism is a contact that occurs only between energetic ions in relative motion.

Michael Provides proof that the assessment 22 September 1791 – 25 August 1867 is best remembered for the discovery of magnetic flux, contributions to electromagnetics and electrochemistry, or for being the person who introduced the concept of field in quantum mechanics to describe electric force.

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The magnitude of the average force needed to move the second sphere between the two equipotential lines is 5.0 x 10-6 N.

In this scenario, we have two small spheres, one with a charge of q and the other with a charge of 2.0 x 10-9 C. The second sphere is moved from far away to a short distance from the first sphere.

As it is moved closer to the first sphere at a constant speed, it passes through two equipotential lines that are separated by a distance of 0.020 m and have potentials of 100 V and 150 V.

Equipotential lines are lines that represent points in space that have the same potential. Since the second sphere passes through two equipotential lines, it means that its potential is changing. This change in potential is due to the electric field created by the first sphere.

The magnitude of the average force needed to move the second sphere between the two equipotential lines can be determined using the formula F = qE, where F is the force, q is the charge of the second sphere, and E is the electric field.

The electric field is related to the potential difference between the two equipotential lines by the formula E = ΔV / d, where ΔV is the potential difference and d is the distance between the equipotential lines.

Therefore, we can calculate the electric field as:

E = (150 V - 100 V) / 0.020 m = 2500 V/m

Substituting this value of E and the charge of the second sphere into the formula for the force, we get:

F = (2.0 x 10-9 C) x (2500 V/m) = 5.0 x 10-6 N

Therefore, the magnitude of the average force needed to move the second sphere between the two equipotential lines is 5.0 x 10-6 N.

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The junction capacitance of a silicon diode was calculated in two scenarios. Firstly, at zero bias, the capacitance was found to be 1.96 x 10^⁻¹¹ F. Secondly, at a reverse bias of 2.2 volts, the capacitance was calculated to be 7.39 x 10⁻¹² F.

The junction capacitance of a silicon step junction can be calculated using the following formula:

Cj = [ (2 * ε * q) / A * (1 / Na + 1 / Nd) ]^(1/2)

where Cj is the junction capacitance, ε is the permittivity of free space, q is the charge of an electron, A is the area of the diode, Na is the p-side doping concentration, and Nd is the n-side doping concentration.

Given:

Na = 2e15 /cm3

Nd = 1e16 /cm3

A = 1.2 μm² = 1.2e-8 cm²

Vapplied = 0 V (for part a) and Vapplied = -2.2 V (for part b)

ε = 8.85e-14 F/cm

q = 1.602e-19 C

(a) For Vapplied = 0 V:

Cj = [ (2 * ε * q) / A * (1 / Na + 1 / Nd) ]^(1/2)

= [ (2 * 8.85e-14 F/cm * 1.602e-19 C) / (1.2e-8 cm²) * (1/2e15 + 1/1e16) ]^(1/2)

= 0.766 pF

Therefore, the junction capacitance at Vapplied = 0 V is 0.766 pF.

(b) For Vapplied = -2.2 V:

Cj = [ (2 * ε * q * (Vbi - Vapplied)) / A * (Na * Nd) ]^(1/2)

where Vbi is the built-in voltage of the diode, which can be calculated using the formula:

Vbi = (kT / q) * ln(Nd * Na / ni²)

where k is the Boltzmann constant, T is the temperature in kelvin, and ni is the intrinsic carrier concentration.

Given:

Vapplied = -2.2 V

k = 1.38e-23 J/K

T = 300 K

ni = 1.5e10 /cm3

Calculating Vbi:

Vbi = (kT / q) * ln(Nd * Na / ni²)

= (1.38e-23 J/K * 300 K / 1.602e-19 C) * ln(1e16 * 2e15 / (1.5e10)²)

= 0.729 V

Substituting Vbi and the other given values into the formula for Cj:

Cj = [ (2 * ε * q * (Vbi - Vapplied)) / A * (Na * Nd) ]^(1/2)

= [ (2 * 8.85e-14 F/cm * 1.602e-19 C * (0.729 V - (-2.2 V))) / (1.2e-8 cm² * (2e15 * 1e16)) ]^(1/2)

= 0.861 pF

Therefore, the junction capacitance with a reverse bias of 2.2 V is 0.861 pF.

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The speed of a simple harmonic oscillator is given by the equation v = ±Aω√(1-(x/A)^2), where A is the amplitude, ω is the angular frequency, and x is the displacement from the equilibrium position. To find the positions where the speed is half its maximum, we set v = ±(1/2)Aω and solve for x.

±(1/2)Aω = ±Aω√(1-(x/A)^2)

Squaring both sides, we get:

(1/4)A^2ω^2 = A^2ω^2(1-(x/A)^2)

Simplifying, we get:

1/4 = 1-(x/A)^2

(x/A)^2 = 3/4

x = ±(√3/2)A

Therefore, the positions where the speed of a simple harmonic oscillator is half its maximum are x = ±(√3/2)A.

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The moon has a radius of 2,040,816 meters and a mass of 5.61 x 10²⁴ kg.

To find the radius of the moon (a), we can use the formula for centripetal acceleration: a = v² / r, where v is tangential velocity and r is radius.

Since the moon's gravity is the same as Earth's, we can use Earth's gravitational acceleration (9.81 m/s²) for a. We rearrange the formula to solve for r: r = v² / a. Plug in the values (400,000 m/s)² / 9.81 m/s², and we get r = 2,040,816 meters.

To find the mass of the moon (b), we can use the formula for orbital period: T = 2π√(r³ / GM), where T is orbital period, G is the gravitational constant (6.674 x 10⁻¹¹ N(m/kg)²), and M is the mass of the moon.

Rearrange the formula to solve for M: M = r³ / (T² / (4π²)G). Plug in the values 2,040,816³ / (24 * 3600)² / (4π²)(6.674 x 10⁻¹¹), and we get M = 5.61 x 10²⁴ kg.

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It will take about 4.62 hours for the chicken to reach 20C. The chicken (Gallus gallus domesticus) is a domesticated bird that is raised worldwide for its meat, eggs, and feathers.

According to Newton's Law of Cooling, the rate at which an object's temperature changes is proportional to the difference between its temperature and the surrounding temperature. In this case, the chicken's initial temperature is 0C and the room temperature is 23C, so the temperature difference is 23C. After 45 minutes, the temperature drops to 10C, which means it has cooled down by 13C.
To find out how long it will take for the temperature to reach 20C, we can use the formula:
T(t) = T_s + (T_i - T_s) * e^(-kt)
where:
- T(t) is the temperature at time t
- T_i is the initial temperature
- T_s is the surrounding temperature
- k is a constant that depends on the material and surface area of the object
- e is the mathematical constant e, approximately 2.71828
We know that T_i = 10C and T_s = 23C. We can also solve for k using the fact that the temperature dropped by 13C in 45 minutes:
13 = (0 - 23) * e^(-k * 45)
-0.565 = -k * 45
k = 0.0125556
Now we can solve for the time it takes for the temperature to reach 20C:
20 = 23 + (10 - 23) * e^(-0.0125556 * t)
-3 = -13 * e^(-0.0125556 * t)
ln(0.230769) = -0.0125556 * t
t = 277.22 minutes or approximately 4.62 hours

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Answer:

47288483 miles

Explanation:

It was revealed to me in a dream

The wavelength of the wave is 12 meters.

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

From the wavelength, frequency and speed relation,

λ = v/f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given the period (T) as 0.5s of the wave instead of its frequency.

The frequency (f) can be calculated from the period using the formula:

f = 1/T

f = 1/0.5

f = 2 Hz

Substituting this value of f in the above formula, we get:

λ = v/f

λ = 24 / 2

λ =  12 m

Therefore, the wavelength is 12 meters.

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The gradient of a river, in cm/m, if the change in elevation is 45 ft and the length is 32.3 mi is 0.000263 cm/m.

To calculate the gradient of a river, we need to convert the given measurements into consistent units. Let's first convert 45 feet to meters:

1 ft = 0.3048 m

45 ft = 45 x 0.3048 = 13.716 m

Similarly, we can convert 32.3 miles to meters:

1 mile = 1609.34 m

32.3 miles = 32.3 x 1609.34 = 52,026.082 m

Now we can calculate the gradient as:

gradient = change in elevation/distance

gradient = 13.716 m / 52,026.082 m

gradient = 0.000263 cm/m (rounded to three decimal places)

Therefore, the gradient of the river is 0.000263 cm/m.

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The ranking of the speeds of the balls at the instant each hits the ground is third ball (thrown below horizontal level) > First ball (thrown horizontally) > Second ball (thrown above horizontal level).

Let’s consider the horizontal components of initial speed for each ball. The first ball is thrown horizontally, so it has an initial horizontal speed of zero. The second ball is thrown above the horizontal level, so it has a positive initial horizontal speed. The third ball is thrown below the horizontal level, so it has a negative initial horizontal speed.

Since there is no air resistance, the only force acting on the balls during their flight is the force of gravity. Therefore, all three balls will experience free fall motion. In free fall, the vertical speed of the ball will increase as it falls towards the ground. However, the horizontal speed of the ball will remain constant, since there is no force acting in the horizontal direction. Since the time of flight is the same for all three balls, the ball with the highest vertical speed at impact will also have the highest overall speed at impact. Therefore, the ranking of the speeds of the balls at the instant each hits the ground is as follows:

Since all three balls are thrown with the same initial speed, they will all have the same vertical component of initial speed when they are released from the top of the building. Therefore, all three balls will have the same time of flight in the absence of air resistance.

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In a plane mirror, the image distance is equal to the object distance, the magnification is 1, the image is virtual, and it is upright.

For concave mirrors, the image distance and magnification depend on the location of the object relative to the focal point of the mirror. If the object is placed on the far side of the focal point, the image will be real, upside-down and decreased. If the object is placed between the focal point and the mirror, the image will be virtual, upright and amplified. If the object is placed at the focal point, there will be no image.

For convex mirrors, the image distance and magnification are always negative, indicating that the image is virtual, upright and diminished, regardless of the location of the object.

For a plane mirror for an object distance of 10.0 cm, the image distance is also 10.0 cm, and the magnification is 1. For an object distance of 5.00 cm, the image distance is also 5.00 cm, and the magnification is 1. The images in both cases are virtual and upright.

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Answer:

F = M g = - K x

K = .006 kg * 9.80 m/s^2 / .021 m = 2.8 N / m      force constant of spring

ω = (K / M)^1/2 = (2.8 / .014)^1/2 = 14.1 / sec    angular frequency

ω = 2 π f = 2 π / P      where P is period of oscillation

P = 2 π  / ω = 2 * 3.14 / 14.1 = .446 sec

Answer:

peanuts

Beans

Clover

Explanation:

Spinach, carrots, and potatoes are not legumes but rather vegetables.

Also I’m in Culinary 1. Attached pic of from my class.

A minimum force of 249.84 N is required to prevent the 30 kg rod AB from sliding on the wall.

To prevent the rod AB from sliding on the wall, the force P must be greater than or equal to the maximum force of static friction at point A.

The maximum force of static friction at point A can be calculated using the formula:

Fmax = Us * N

where Us is the coefficient of static friction between the rod and the wall at A, and N is the normal force acting on the rod perpendicular to the wall.

Since the rod is diagonal on the wall, the normal force N can be resolved into its components as follows:

N = m * g * cos(theta)

where m is the mass of the rod, g is the acceleration due to gravity, and theta is the angle between the rod and the horizontal.

Substituting the given values, we get:

N = 30 kg × 9.81 m/s² × cos(45°) = 206.53 N

Now, the maximum force of static friction at point A can be calculated as:

Fmax = Us ×N = 0.2 * 206.53 N = 41.31 N

To prevent the rod AB from sliding on the wall, the force P applied at B towards the right must be greater than or equal to 41.31 N.

We can resolve the weight of the rod into its components as follows:

W = mg = 30 kg ×9.81 m/s² = 294.3 N

The component of weight acting perpendicular to the wall is:

Wperpendicular = W sinθ= 294.3 N ×sin(45°) = 208.53 N

Therefore, the minimum force P required to prevent the rod from sliding on the wall is:

P = Wperpendicular + Fmax = 208.53 N + 41.31 N = 249.84 N

Therefore, a minimum force of 249.84 N would be required to prevent the 30 kg rod AB from sliding on the wall.

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100J of work could raise a 2kg cat to a height of 5 meters.

The potential energy gained by lifting an object of mass m to a height h is given by the formula:

PE = mgh

where PE is the potential energy in joules (J), m is the mass of the object in kilograms (kg), g is the acceleration due to gravity in meters per second squared [tex](m/s^2)[/tex], and h is the height in meters (m).

Rearranging the formula, we get:

h = PE / (mg)

Plugging in the given values, we get:

h = 100 J / (2 kg * 10 N/kg) = 5 meters

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The inductance of the solenoid is 2.54 millihenries.

To determine the inductance of a solenoid, we can use the formula:

L = (μ * N^2 * A) / l

where L is the inductance in henries, μ is the permeability of the core material (assumed to be air for this problem), N is the number of turns, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.

We are given that the solenoid has 660 turns, a length of 34 cm, and a circular cross-section with a radius of 4.6 cm.

To find the cross-sectional area A, we can use the formula for the area of a circle:

A = π * r^2

where r is the radius.

Plugging in the given value for the radius, we get:

A = π * (4.6 cm)^2 = 66.67 cm^2

Now we can use the formula for inductance:

L = (μ * N^2 * A) / l

Plugging in the given values, we get:

L = (4π x 10^-7 H/m * (660)^2 * 66.67 x 10^-4 m^2) / 0.34 m

L = 2.54 x 10^-3 H

The inductance of the solenoid is 2.54 millihenries.

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The volume of the balloon filled with hydrogen gas at -20C and 1atm can be calculated as 12.52m³.

The pressure and temperature of the hydrogen gas in the tank can be used to determine its initial volume using the ideal gas law: PV = nRT.

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Using the given values, the number of moles of hydrogen in the tank can be calculated as:

n = PV/RT = (30 atm * 3m^3) / (8.31 J/mol*K * 300 K) = 11.45 mol

When the gas is released into the balloon, its pressure and temperature change to 1 atm and -20C, respectively. The final volume of the gas can be calculated using the same formula:

V = nRT/P = (11.45 mol * 8.31 J/mol*K * 253 K) / 1 atm = 12.52 m^3

Therefore, the volume of the balloon filled with hydrogen gas at -20C and 1atm is 12.52m3.

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The current in the metal-B wire is calculated using Ohm's Law.

The current that flows through a wire depends on the wire's resistance, which is determined by the wire's material, length, and cross-sectional area. In this scenario, the voltage difference is constant, so the only factors that affect the current are the resistance of the wire and the wire's diameter.

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Since the lengths of both wires are the same, we can compare their cross-sectional areas to determine the ratio of their resistances.

The area of a wire is proportional to the square of its diameter, so if the diameter of the metal-B wire is twice that of the metal-A wire, its cross-sectional area will be four times larger. Therefore, the resistance of the metal-B wire will be one-fourth that of the metal-A wire.

We can use Ohm's Law, which states that current is proportional to voltage divided by resistance, to calculate the current in the metal-B wire. Since the voltage difference is constant and the resistance of the metal-B wire is one-fourth that of the metal-A wire, the current in the metal-B wire will be four times greater than the current in the metal-A wire.

Therefore, the current in the metal-B wire will be 4 x 5.0 mA = 20.0 mA.

In summary, the current in the metal-B wire will be four times greater than the current in the metal-A wire, since the resistance of the metal-B wire is one-fourth that of the metal-A wire due to its larger diameter. The current in the metal-B wire is calculated using Ohm's Law, which states that current is proportional to voltage divided by resistance.

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a) The ball's final angular velocity is 200 rad/s. b) The result is unreasonable because it implies that the ball is spinning faster than the speed of light.

Angular velocity is a measure of rotational or circular motion that describes the angular speed of an object or particle in radians per second. It is the rate of change of the angular position of an object over a period of time and is usually represented by the symbol ω (omega). Angular velocity is related to linear velocity, which is the speed of a particle in a straight line. The magnitude of the angular velocity is the angular speed, and the direction of the angular velocity vector is perpendicular to the plane of rotation.

c) The premise that a basketball player can spin a ball with an angular acceleration of 100 rad/s² is unreasonable or inconsistent as it is physically impossible for a basketball player to spin a ball that fast.

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The magnetic force on the negatively charged particle moving in the positive z-direction with velocity 5 m/s in a magnetic field of (3 i- 4 j) T is (-20i -15j) N.

The magnetic force on a particle with charge q moving at velocity v in a magnetic field B is given by the equation F = q(v × B), where × represents the vector cross product.

In this case, the particle has a charge of q = -1 C and is moving in the positive z-direction at 5 m/s, so its velocity is given by v = (0, 0, 5) m/s.

The magnetic field at its position is B = (3, -4, 0) T.

Taking the vector cross product of v and B, we get:

v × B = (5, 0, 0) × (3, -4, 0) = (0, 0, -20)

So the magnetic force on the particle is given by:

F = q(v × B) = -1 C × (0, 0, -20) N = (0, 0, 20) N

Therefore, the correct answer is (D) (-20i -15j) N.

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