A very small object with mass 6.90 × 10^−9 kg and positive charge 8.30 × 10^−9 C is projected directly toward a very large insulating sheet of positive charge that has uniform surface charge density 5.90 x 10^-8 C/m^2. The object is initially 0.530 m from the sheet.

What initial speed must the object have in order for its closest distance of approach to the sheet to be 0.170 m ?,

Answer:

[tex]m = 2.72 \times 10^{-3} g[/tex]

Explanation:

total number of protons in 5 gram of total mass is given as

[tex]N = \frac{m}{m_p}[/tex]

here we have

[tex]N = \frac{5}{1.67262 \times 10^{-24}}[/tex]

[tex]N = 2.99 \times 10^{24}[/tex]

now to neutralize the charge we require same amount of negatively charge electrons

so we have

[tex]m = N(m_e)[/tex]

[tex]m = (2.99 \times 10^{24})(9.1 \times 10^{-28})[/tex]

[tex]m = 2.72 \times 10^{-3} g[/tex]

Answer:

C) a white lab rat and a loud noise

Explanation:

egde 2020

A lever increases applied force by offering a mechanical advantage, which redistributes the force over a longer distance but does not change the overall work done, as work is the product of force and distance which remains constant.

A lever can increase the force applied without changing the amount of work being done by reallocating the distance over which the force is applied. The mechanical advantage provided by a lever allows a smaller input force to lift a heavier load. However, as with all machines, the lever does not change the amount of mechanical work done. This means that a lever that increases force will decrease the distance that the load moves, and the product of the force applied and the distance moved (work) remains constant. The mechanical advantage of the lever is the ratio of these forces, and it demonstrates how a simple machine outputs the same amount of work with a reduced effort force by increasing the distance over which the effort force is applied.

In practice, for instance, when we use a crowbar to lift a heavy object, we apply a small force over a larger distance at one end of the lever (the effort arm), and the crowbar applies a larger force over a shorter distance at the other end (the resistance arm) to lift the object. The work done remains the same since it is the product of force and distance.

Power can be defined as the rate at which the work has been accomplished in a system. Thus, the correct option is D.

The power is the quantity which has only magnitude, that is a scalar quantity. The SI unit of power is watt, and it is also written as J/s or Joules per second.

Power can be defined as the rate at which the work is finished or the energy is transferred from one location to another or energy transformed from one form into another form.

The term energy is the capacity of a body to do work or result in some displacement by the application of some force.

Therefore, the correct option is D.

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Answer:

180

Explanation:

If the work input equals 240 then we follow the equation for work output.

Work output = (work input x efficiency)/100%

Work output = (240 x 75%)/100%

Work output = 180/100%

Work output = 180

Final answer:

Applying the conservation of momentum, the 50 kg astronaut ejecting 100 g of gas at 50 m/s in space will have a resulting velocity of 0.1 m/s in the opposite direction.

Explanation:

To calculate the resulting velocity of the 50 kg astronaut after ejecting 100 g of gas at a velocity of 50 m/s, we apply the principle of conservation of momentum, assuming a frictionless environment such as space. Before ejection, the astronaut and the gas are stationary, so their combined momentum is 0 kg*m/s. After the ejection, the momentum remains 0 kg*m/s, which means that the momentum gained by the astronaut is equal and opposite to the momentum of the ejected gas.

The mass of the ejected gas is 0.1 kg (100 g) and its velocity is 50 m/s, giving it a momentum of 0.1 kg * 50 m/s = 5 kg*m/s. To find the astronaut's velocity (v_astronaut), we use the equation:

Momentum of astronaut = - (Momentum of gas)

50 kg * v_astronaut = - (0.1 kg * 50 m/s)

This simplifies to:

v_astronaut = - (0.1 kg * 50 m/s) / 50 kg

Calculating this gives:

v_astronaut = - (5 kg*m/s) / 50 kg

So, v_astronaut = -0.1 m/s. The negative sign indicates the direction opposite to the ejected gas.

Therefore, the astronaut's resulting velocity is 0.1 m/s in the direction opposite to the direction of the ejected gas.

D

A

A

D

B

D

just took on connections !!!!!

The answer is solar flare. Solar flares are commonly accompanied by coronal mass ejection. Solar flares are periods when the sun is suddenly brighter at a spot at its surface. This is due to the ejection of electrons, ions, and atoms (plasma clouds) accompanied by electromagnetic waves.

Answer: Solar flare

Explanation:

To summarize, the maximum angular acceleration of the pendulum's swing is 0.019 rad/s², and the maximum restoring force is 0.479 N, calculated using the principles of simple harmonic motion and confirmed with energy conservation principles.

To find the maximum angular acceleration, we can use the formula for angular acceleration: α = δθ/δt². In the context of a simple pendulum like this one, the angular acceleration at its maximum displacement is α = g/L * sin(θ), where g is the acceleration due to gravity (9.81 m/s²) and L is the length of the pendulum. Substituting the given values in, we find α = (9.81 m/s²/7.00 m) * sin(8.0°) = 0.019 rad/s² to three decimal places.

The maximum restoring force can be found using the formula F = ma, where m is the mass and a is the acceleration. In this case, the maximum restoring force, F = 0.350 kg * 9.81 m/s² * sin(8.0°) = 0.479 N to three decimal places.

To confirm these calculations, we could use an alternative model, such as energy conservation. In the energy model, the potential energy at the point of maximum displacement (the highest point of swing) is converted to kinetic energy at the lowest point. We also know that maximum restoring force coincides with maximum displacement in simple harmonic motion, while maximum speed (already calculated and given as 1.156 m/s) coincides with the position of equilibrium (the bottom of the swing).

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Part (a):-  [tex]\( v_{\text{max}} = 1.156 \)[/tex] m/s, which is correct. This part is complete.

Part (b):- [tex]\[ \alpha_{\text{max}} \approx 0.0280 \, \text{rad/s}^2 \][/tex]

Part (c):- [tex]\[ F_{\text{max}} \approx 0.4806 \, \text{N} \][/tex]

Part (d):- These models provide a comprehensive approach to analyze the motion of the simple pendulum, considering kinetic energy, potential energy, and forces involved.

Given data:

- Mass of the pendulum bob,  m = 0.350  kg

- Length of the pendulum,  L = 7.00  m

- Maximum angle of displacement,[tex]\( \theta = 8.0^\circ = 8.0 \times \frac{\pi}{180} \)[/tex] radians

You've already found this to be [tex]\( v_{\text{max}} = 1.156 \)[/tex] m/s, which is correct. This part is complete.

The maximum angular acceleration occurs at the maximum displacement, when the restoring force is at its maximum.

1. Calculate the gravitational acceleration:

 [tex]\[ g = 9.81 \, \text{m/s}^2 \][/tex]

2. Calculate the maximum restoring torque:

  The torque due to gravity at maximum displacement is:

  [tex]\[ \tau = mg \sin \theta \][/tex]

  where[tex]\( \theta \)[/tex] is the angle of displacement.

  [tex]\[ \tau = 0.350 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times \sin(8.0^\circ) \][/tex]

  [tex]\[ \tau \approx 0.350 \times 9.81 \times 0.1392 \approx 0.4806 \, \text{Nm} \][/tex]

3. Calculate the moment of inertia of the pendulum bob:

[tex]\[ I = m L^2 \][/tex]

 [tex]\[ I = 0.350 \, \text{kg} \times (7.00 \, \text{m})^2 = 17.15 \, \text{kg} \cdot \text{m}^2 \][/tex]

4. Calculate the maximum angular acceleration [tex]\( \alpha_{\text{max}} \):[/tex]

  [tex]\[ \alpha_{\text{max}} = \frac{\tau}{I} \][/tex]

  [tex]\[ \alpha_{\text{max}} = \frac{0.4806}{17.15} \][/tex]

  [tex]\[ \alpha_{\text{max}} \approx 0.0280 \, \text{rad/s}^2 \][/tex]

The maximum restoring force occurs at maximum displacement:

1. Calculate the maximum restoring force [tex]\( F_{\text{max}} \):[/tex]

  [tex]\[ F_{\text{max}} = mg \sin \theta \][/tex]

 [tex]\[ F_{\text{max}} = 0.350 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times \sin(8.0^\circ) \[/tex]]

 [tex]\[ F_{\text{max}} \approx 0.350 \times 9.81 \times 0.1392 \approx 0.4806 \, \text{N} \][/tex]

Let's summarize the solutions using other analysis models:

1. Energy Analysis Model (Kinetic and Potential Energies):

  - Maximum speed of the bob: [tex]\( v_{\text{max}} = 1.156 \) m/s[/tex]

  - Maximum potential energy: [tex]\( PE_{\text{max}} = mgh \)[/tex]

  - Maximum kinetic energy: [tex]\( KE_{\text{max}} = \frac{1}{2}mv_{\text{max}}^2 \)[/tex]

2. Force Analysis Model:

  - Maximum restoring force: [tex]\( F_{\text{max}} = mg \sin \theta \)[/tex]

  - Maximum angular acceleration: [tex]\( \alpha_{\text{max}} = \frac{\tau}{I} \),[/tex] where [tex]\( \tau = mg \sin \theta \) and \( I = mL^2 \)[/tex]

Answer:

the weight of the bookcase is 363N

The example of figurative language in the phrase "the toast jumped out of the toaster" is a metaphor. Using figurative language in an argument can make it more engaging and persuasive.

The example of figurative language in the phrase "the toast jumped out of the toaster" is a metaphor. A metaphor is a figure of speech that compares two different things by saying one thing is another thing, without using the words "like" or "as". In this case, the toast is compared to something that jumps, which creates a vivid image and adds interest to the description.

The effect of using this metaphor in an argument could be to make the argument more engaging and memorable. By using figurative language, the writer or speaker can convey their message in a more creative and impactful way, capturing the attention of the audience and making the argument more persuasive.

Answer:

The answer in B

Explanation:

I did the test and doubled check with my teachers.

In a series circuit represented by Ohm's law, the correct formulas to use are I = I1 = I2 = I3 for region X and Req = R1 + R2 + R3 for region Y, indicating that current remains constant through components and resistances are additive.

Wendy is working with Ohm's law and electric circuits and needs to know which formulas apply to regions marked X and Y in her graphic organizer. Ohm's law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit and is given by V = IR. When multiple resistors are present in a circuit, their total or equivalent resistance (Req) and the total current depend on whether they are arranged in series or parallel.

In a series circuit, the total current (I) remains the same through all the components, and the voltages across each component add up. Hence, I = I1 = I2 = I3 which would be the correct formula for region X. For region Y, in a series circuit, the equivalent resistance (Req) is simply the sum of all individual resistances, thus Req = R1 + R2 + R3 is the correct formula.

However, in a parallel circuit, the voltage across all components is the same and the currents through each component add up to the total current, which is represented by I = I1 + I2 + I3, but this does not apply to the original question.

Answer:

The answer is radio waves

Hope that helps! :)

Answer:

1391

Explanation:

Electrical energy is transformed into other forms of energy such as mechanical or thermal when passing through household devices like blenders or toasters.

When electrical energy passes through a household device such as a blender or a toaster, it is transformed into another form of energy. This process is known as energy transformation. For instance, in a blender, the electrical energy is converted into mechanical energy to spin the blades, and in a toaster, it is transformed into thermal energy to heat the bread. This transformation of energy allows the appliances to perform their respective functions.

The relationship between mass and acceleration according to Newton's second law of motion is that acceleration is directly proportional to the net external force and inversely proportional to the mass of the object. So, larger mass leads to smaller acceleration for the same applied force.

According to Newton's second law of motion, the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. This essentially means that the larger the mass of an object, the smaller its acceleration will be when a net external force is applied, due to the object's increased inertia. For example, if you try to push a car and a bicycle with the same amount of force, the car (which has a greater mass) will accelerate slower than the bicycle (which has less mass).

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Final answer:

The motion of moving the jump rope up and down creates transverse waves where the rope moves perpendicular to the direction of wave propagation. When waves from opposite ends meet, they interfere and superpose, forming various resulting wave patterns.

Explanation:

When a girl attaches the end of her jump rope to the trunk of a tree, evidence that the rope can support a transverse wave is observed by moving the free end of the rope up and down. This motion would cause the rope to move perpendicular to the direction of the wave's travel, which characterizes a transverse wave.

If there were two transverse waves created from opposite ends, with one wave traveling towards the other, one would anticipate seeing a superposition of the two waves when they meet. This interaction, where two waves overlap and combine, is an example of wave interference. The resultant wave pattern can vary depending on the relative phases and amplitudes of the interacting waves, illustrating concepts such as constructive or destructive interference.