b. the ball becomes positively charged by induction

c. the string is not a perfect insulator

d. there is a rearrangement of the electrons in the ball

e. the number of electrons in the ball is more than the number in the rod

Answer:

**Answer:**

d. there is a rearrangement of the electrons in the ball

**Explanation:**

Inside the neutral metal ball, there are equal no. of positive charges (protons) and negative charges (electrons). Normally, the charges are distributed evenly throughout the ball.

However, when the positively charged insulating rod is brought near, since positive charges and negative charges attract each other, the electrons (-ve charges) in the metal ball moves towards the side nearest to the rod. The metal ball gets attracted to the rod.

a and b are not correct because the rod is insulating, so electrons cannot be transferred between them to induce a net charge in the metal ball. the no. of electrons is unrelated to the attraction between opposite charges , so e is incorrect as well.

A series circuit contains a 20-Ω resistor, a 200-mH inductor, a 10-μF capacitor, and an ac power source. At what frequency should the power source drive the circuit in order to have maximum power transferred from the driving source?

In the process of changing a flat tire, a motorist uses a hydraulic jack. She begins by applying a force of 48 N to the input piston, which has a radius r1. As a result, the output plunger, which has a radius r2, applies a force to the car. The ratio r2/r1 has a value of 9.0. Ignore the height difference between the input piston and output plunger and determine the force that the output plunger applies to the car.

Based on the measured force between objects that are 10 meters apart, how can you find the force between objects that are any distance apart ?

A piano tuner hears a beat every 2.20 s when listening to a 266.0 Hz tuning fork and a single piano string. What are the two possible frequencies (in Hz) of the string? (Give your answers to at least one decimal place.)

A 1850 kg car traveling at 13.8 m/s collides with a 3100 kg car that is initally at rest at a stoplight. The cars stick together and move 1.91 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels on both cars lock at the time of impact.

In the process of changing a flat tire, a motorist uses a hydraulic jack. She begins by applying a force of 48 N to the input piston, which has a radius r1. As a result, the output plunger, which has a radius r2, applies a force to the car. The ratio r2/r1 has a value of 9.0. Ignore the height difference between the input piston and output plunger and determine the force that the output plunger applies to the car.

Based on the measured force between objects that are 10 meters apart, how can you find the force between objects that are any distance apart ?

A piano tuner hears a beat every 2.20 s when listening to a 266.0 Hz tuning fork and a single piano string. What are the two possible frequencies (in Hz) of the string? (Give your answers to at least one decimal place.)

A 1850 kg car traveling at 13.8 m/s collides with a 3100 kg car that is initally at rest at a stoplight. The cars stick together and move 1.91 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels on both cars lock at the time of impact.

**Answer:**

Use proportions to find the scale of the first photo, then use that scale and other given information to fill in the equation

S=f/(H-h)

Where:

S = scale of the photo

f = focal length of the camera (in feet)

H = flying height

h = average elevation

**Answer:**

i believe that it is d

**Explanation:**

In a super heater, the temperature of the steam rises while the pressure remains constant. This process helps to remove the last traces of moisture from the saturated steam.

In a super heater, the conclusion is that option (C) **pressure** remains constant and** temperature **rises is the correct choice. A super heater is a device used in a steam power plant to increase the temperature of the steam, above its saturation temperature. The function of the super heater is to remove the last traces of moisture (1 to 2%) from the saturated steam and to increase its temperature above the saturation temperature. The pressure, however, remains constant during this process because the super heater operates at the same pressure as the boiler.

#SPJ2

The angular momentum can be found by the formula:

L = m · v · r

Where:

m = mass of Earth = 5.972×10²⁴ kg

v = velocity of Earth around the Sun = 2.978×10⁴ m/s

r = distance from Sun = 1.496×10¹¹ m

Now, apply the formula:

L = 5.972×10²⁴ · 2.978×10⁴ · 1.496×10¹¹

= 2.661×10⁴⁰ kg·m²/s

The angular momentum of Earth in its motion around the Sun is**2.661****×10⁴⁰ kg·m²/s**.

L = m · v · r

Where:

m = mass of Earth = 5.972×10²⁴ kg

v = velocity of Earth around the Sun = 2.978×10⁴ m/s

r = distance from Sun = 1.496×10¹¹ m

Now, apply the formula:

L = 5.972×10²⁴ · 2.978×10⁴ · 1.496×10¹¹

= 2.661×10⁴⁰ kg·m²/s

The angular momentum of Earth in its motion around the Sun is

**Is known:**

**m = Earth's mass = 5.972 × 10²⁴ kg**

**v = the speed of the Earth around the Sun = 2,978 × 10⁴ m / s**

**r = distance from the Sun = 1.496 × 10¹¹ m**

**Asked:**

**L?**

**Answer:**

**L = m · v · r**

**L = 5,972 × 10²⁴ · 2,978 × 10⁴ · 1,496 × 10¹¹**

**L = 2,661 × 10⁴⁰ kg · m² / s**

**So, the angular momentum of the Earth in its motion around the Sun is 2.661 × 10⁴⁰ kg · m² / s.**

In physics, **momentum** is a quantity related to the velocity and mass of an object. in classical mechanics, momentum (denoted by P) is defined as the product of mass and velocity, thus producing vectors.

The momentum of an object (P) having mass m and moving with velocity v is defined as:

**P = mv**

**Mass** is a scalar quantity, while velocity is a vector quantity. Multiplication of scalar quantities with vector quantities will produce vector quantities. So, momentum is a vector quantity. The momentum of a particle can be seen as a measure of the difficulty of settling an object. For example, a heavy truck has greater momentum than a light car that moves at the same speed. Greater force is needed to stop the truck compared to a lightweight car in a certain amount of time. (The magnitude of mv is sometimes expressed as linear momentum of the particle to distinguish it from angular momentum).

**Speed** is a vector quantity that shows how fast an object is moving. The magnitude of this vector is named speed and is expressed in units of meters per second (m / s or ms − 1). The mass may be a property of an object that's accustomed to explain the varied behaviors of the item being monitored. In everyday use, mass is typically synonymous with weight. But in keeping with modern scientific understanding, the burden of an object is caused by the interaction of mass with the field

**Learn more**

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**Details**

Grade: College

Subject: Physics

keywords: momentum

B. What is the on-axis magnetic field strength 4.70 cm from the ring?

Answer:

0.000314 Am²

6.049*10^-7 T

Explanation:

A

From the definitions of magnetic dipole moment, we can establish that

= , where

= the magnetic dipole moment in itself

= Current, 100 A

= Area, πr² (r = diameter divided by 2). Converting to m², we have 0.000001 m²

On solving, we have

= ,

= 100 * 3.14 * 0.000001

= 0.000314 Am²

B

=(0)/4* 2/³, where

(0) = constant of permeability = 1.256*10^-6

z = 4.7 cm = 0.047 m

B = 1.256*10^-6 / 4*3.142 * [2 * 0.000314/0.047³]

B = 1*10^-7 * 0.000628/1.038*10^-4

B = 1*10^-7 * 6.049

B = 6.049*10^-7 T

The magnetic dipole moment of the superconducting ring is 0.000314 Ampere*m². The on-axis magnetic field strength 4.70 cm from the ring is 6.56 μT.

The **magnetic dipole moment** (**μ**) of a current (**I**) circulating around a loop of radius (r) is given by the formula μ = Iπr². Substituting the given values in SI units (I=100 Ampere, r=1.00 mm = 0.001 m), we get μ = 100 * π * (0.001)² = 0.000314 Ampere*m².

To find out the on-axis **magnetic field** strength (**B**) at a certain distance from the ring, we use the formula B = μ0/(4π) * (2μ/r³), where μ0 represents the permeability of free space. Plugging the values in SI units (μ0 = 4π × 10-7 T*m/A, r=4.70 cm = 0.047 m), The magnetic field is calculated to be B = (4π × 10-7 T*m/A) /(4π) * (2 * 0.000314 m² / 0.0473m³) = 6.56 × 10-6 T or 6.56 μT.

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The **momentum** of the **car** is **24000 Kg•m/s**

**Momentum** is defined as the **product** of **mass and velocity.** Mathematically, it can be expressed as:

**Momentum = mass × velocity**

With the **above formula,** we can obtain the **momentum** of the **car** as follow:

- Mass = 1200 Kg

- Velocity = 20 m/s

**Momentum =?**

Momentum = mass × velocity

Momentum = 1200 × 20

**Momentum of car = 24000 Kg•m/s**

Learn more about **momentum**:

**Answer:**

24000 kg·m/s

**Explanation:**

Momentum is Mass x Velocity, so 1200 kg time 20 m/s = 24000 kg-ms/s

**Answer:**

The charge that passes through the starter motor is .

**Explanation:**

__Known Data__

- Avogadro's Number
- Current,
- Charge in an electron,
- Time,
- Diameter,
- Transversal Area,
- Volume,

__First Step: Find the number of the electrons per unit of volume in the wire__

We use the formula .

__Second Step: Find the drag velocity__

We can use the following formula

Finally, we use the formula .