differences between low-mass and high-mass stars include the fact that high-mass stars . (select all that apply.)

Sound intensity level (SIL) is measured in decibels (dB).

What is sound?

Sound is a type of energy created by the vibration of particles in a medium, such as air, that can be heard when it reaches a person or animal's ear. Sound can travel through solids, liquids, and gases, and can have different pitches and volumes.

Sound intensity level is defined as the ratio of the sound pressure to a reference pressure level. It is calculated using the following equation: SIL (dB) = 10 log10 (I/I_0), where I is the sound intensity and I_0 is the reference sound intensity equal to 10^−12 W/m^2.

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Answer:

d

Explanation:

it is never stated in science

Objects of the same size will accelerate equally if they have different forces applied to them. This statement (D) does NOT apply to Newton’s second Law of Motion.

Newton’s second law of motion states that “Force is equal to the rate of change of momentum. For a constant mass, force equals mass times acceleration.

As momentum is product of mass and velocity, the more mass something has, the more force it would take to accelerate it.  So option (A) is correct.

As rate of change of momentum of a body refers product of mass and acceleration of a body,  the more force applied to an object’s mass, the more it will accelerate and the force required to accelerate an object equals the objects mass times it’s acceleration. So, option (B) and (C) is correct.

But  force has no direct elation with size of the body. So, option (D) is not correct.

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The distance of the object from the mirror is 18.3 cm.

The height of the object is 7.28 cm.

The magnification is greater than 1, which means the image is larger than the object, and it is upright.

Focal length of the convex mirror, f = 33 cm (positive for a convex mirror)

Distance of the image from the mirror, di = -19 cm (negative since the image is formed behind the mirror)

Height of the image, hi = 7.0 cm

To find the position and height of the object (the soda bottle), we can use the mirror formula:

\(\frac{1}{f}= \frac{1}{d_0} + \frac{1}{d_1}\)

where do is the distance of the object from the mirror. Rearranging the formula, we get:

\(\frac{1}{f}= \frac{1}{d_0} + \frac{1}{d_1}\)

\(\frac{1}{d_0}\) = 1/33 - 1/-19

\(\frac{1}{d_0}\)  = 0.0545

\(d_0\) = 18.3 cm

To find the height of the object, we can use theformula:

m = \(\frac{-d_i}{d_0}\)

m = -(-19)/18.3

m = 1.04

Therefore, the height of the object is:

h0 = m * hi = 1.04 * 7.0 cm = 7.28 cm

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The distance which a force of 3N will pull a wooden block before transferring 12J of energy is 4m.

This is referred to as an influence that can change the motion of an object and the unit is Newton.

It has a relationship with distance and work which can be seen below:

Work = Force × distance

12J = 3N × d

d = 12/3 = 4m.

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The statement is true. When a force is applied over a larger area, the stress is greater.

Stress is defined as the force applied per unit area, so if the same force is spread over a larger area, the stress will be lower. On the other hand, if the same force is concentrated over a smaller area, the stress will be higher. This is because the force is distributed over a larger surface area, reducing the intensity of the force per unit area. In simple terms, if you push down on a small area with a certain amount of force, it will create more pressure than if you push down on a larger area with the same force. Therefore, the greater the area over which a force is applied, the greater the stress is. This concept is important in fields such as engineering and materials science, where stress analysis plays a crucial role in designing structures and determining their strength.

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In a photoelectric effect experiment, the stopping potential depends on what metal is being used as target and  the frequency of the incident light. Hence both (a) and (c) are correct.

Stopping potential refers to the potential required to inhibit the ejection of electron from the surface of metal, when the incident beam of energy is greater than the work potential of metal it is directed on.

Photoelectrons emit from a metal, when illuminated with light, with threshold frequency higher than that of metal, with a range of KE’s. The stopping potential is the voltage between a metal surface and a cathode placed near the surface in a vacuum that stops generating current. Then we can assume that the maximum KE of the photoelectron is KE(max) = eV(s). where V(s) is the stopping potential. Einstein theorized that a photon carries an energy equal to E(p) = hf, and that the minimum energy required for a photon to penetrate a surface is a constant called the "work function" of the metal W. rice field. KE(max)=hf-W, or eV(s) = hf-W.

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Answer: 6

Explanation:

Have an awesome amazing day

Answer:

2 plus 2 = 4 AND 1 plus 1 = 2

Explanation:

I guess combine both equations if your detailed instructions allow.

Four blocks, each weighing 5.00 kg, 4.70 kg, 7.00 kg, and 7.00 kg respectively. The magnitude of the tension between the m2 and m3 blocks is 84.5 N.

In this problem, we have four blocks connected by ropes on a horizontal frictionless surface. A force F of magnitude 28.0 N and making an angle of 36.0 degrees with the horizontal is applied to the system, pulling the blocks to the right. We are asked to find the tension T between blocks m2 and m3.

First, we can use the force F to find the acceleration of the system. The x-component of the force is Fx = F cos(θ) = 22.6 N, and this is the net force acting on the system in the x-direction. Using Newton's second law, F = ma, we can solve for the acceleration a:

a = Fx / (m1 + m2 + m3 + m4)

a = 22.6 N / (5.00 kg + 4.70 kg + 7.00 kg + 7.00 kg)

= 1.19 m/s^2

Next, we can consider the forces acting on block m2. There are two forces acting on this block: the tension T to the left and the force of gravity mg to the right. Since the block is not accelerating vertically, the force of gravity must be balanced by the tension T:

T = m2g

= (4.70 kg)(9.81 m/s^2) = 46.1 N

Now, we can consider the forces acting on block m3. Again, there are two forces acting on this block: the tension T to the right and the force of gravity mg to the left. Since the block is accelerating to the right, the net force acting on the block in the x-direction must be equal to m3 times the acceleration:

T - m3g sin(θ) = m3a

Substituting the given values and solving for T, we get:

T = m3a + m3g sin(θ)

= (7.00 kg)(1.19 m/s^2) + (7.00 kg)(9.81 m/s^2) sin(36.0°)

= 84.5 N

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The minimum current through R1 will be 10mA.

Using Ohm's Law (V = IR), we can find the minimum current through R1 as follows:

Vr1 = Vz5 + Vz6

where Vr1 is the voltage across resistor R1.

Therefore, the minimum current through R1 is:

Ir1 = Vr1 / R1

Assuming that R1 is a standard value resistor (e.g., 1kΩ), and the Zener voltages are each 5V, the voltage across R1 will be:

Vr1 = Vz5 + Vz6 = 5V + 5V = 10V

Therefore, the minimum current through R1 will be:

Ir1 = Vr1 / R1 = 10V / 1kΩ = 10mA

Current is the flow of electric charge through a conductor or material. It is defined as the rate of flow of electric charge, measured in units of amperes (A). One ampere is equivalent to the flow of one coulomb of electric charge per second.

Electric current is caused by the movement of charged particles, typically electrons, in a circuit. When a voltage is applied to a conductor, it creates an electric field that causes electrons to move through the conductor. This flow of electrons constitutes an electric current.

The direction of electric current is defined as the direction of flow of positive charges, even though the actual charges that move are electrons, which are negatively charged. Electric current can be direct current (DC), where the flow of charge is in one direction, or alternating current (AC), where the direction of flow periodically changes.

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Answer:

The velocity and direction after 1 second is 8.1 m/s downwards

Explanation:

The equation of motion for an object in free fall can be written as follows;

v = u + g×t

Where;

v = The final velocity of the object

u = The initial velocity of the object = 0 m/s

g = The acceleration due to gravity = 9.81 m/s²

The velocity after one second is given by the velocity equation as follows;

v = 0 + 9.81 m/s² * 1 s = 9.81 m/s

The direction of the is downwards due to the attraction by the Earth's gravitational field which acts towards the Earth's center

Therefore, the velocity and direction after 1 second is 8.1 m/s downwards.

Answer:

People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does  

Explanation:

Answer:

People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does  

Explanation:

The acceleration of the elevator at this time was 2m/s² and the elevator was accelerating the upward direction.

The mass of the child standing on a spring scale in an elevator is 30 kg the elevator is showing a reading of 360 Newtons.

The reading note by the elevator is given by radiation,

W = M(g+a)

Where w is the reading of the spring scale,

M is the mass of the child,

g is the gravitational acceleration which is given to be 10m/s² and a is the acceleration of the elevator.

Putting values,

360 = 30(10+a)

12 = 10+a

a = 2m/s²

As you can see from the above result that the acceleration of the lift is 2m/s² and because it is positive it means that the elevator is accelerating in the upward direction.

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Answer:

1.A

2.C

3.B

4. i.dk about that one

Explanation:

1. It is true that Tracking your exercise can help you stick with an exercise routine.

2. Yes, it is best to do as many different kinds of exercise as possible.

3. Building muscle strength helps with all aspects of fitness

4. Yoga would be the best exercise to achieve this goal.

Exercise is any activity that utilizes the physical movements of the body that improves a people's health, endurance, and wellbeing while lowering their chance of contracting illnesses. It enables the person to keep their body weight in a healthy weight range.

The benefits of fitness fluctuate depending on the sort of dying a person experiences. Even if a muscle is stretched, excessive sitting can cause a number of illnesses, many of which are fatal. The individual should engage in mobility activities as well as exercising to improve their stamina.

Thus, exercise is very necessary for health.

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The expression for the capacitance per meter of a coaxial cable is C = \frac{2\pi\epsilon_0}{\ln(b/a)}

The capacitance per unit length of a coaxial cable with inner radius a and outer radius b is given by:

C = \frac{2\pi\epsilon_0}{\ln(b/a)}

where \epsilon_0 is the permittivity of free space.

To find the capacitance per meter of the coaxial cable, we divide this expression by the length of the cable, L:

C_{\text{per meter}} = \frac{C}{L} = \frac{2\pi\epsilon_0}{L\ln(b/a)}

Since the cable is assumed to have air as the insulating material between the cylinders, we can assume that \epsilon_r = 1 and \epsilon = \epsilon_0 (the permittivity of free space), which gives us the above expression.

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Answer:

It is D.

Explanation:

Sound travels by the movement of particles bumping against each other and if there is no particles in a vacuum(space) then there is no sound. Light can travel through space because it doesn't need to travel by/through particles.

Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

Answer:

The usual way to do this is to pass oxygen gas from a compressed gas cylinder through a coil of hollow copper pipe which is submerged in liquid nitrogen. The copper coil is a good conductor of heat and has a large surface area. Liquid oxygen is then usually collected in a thermos flask.

Answer:

attract the magnetic ratio engine light of rock level

According to the given information angular speed of the second hand of a smoothly running analog watch is 6 degrees per second (360 degrees divided by 60 seconds). The angular speed of the minute hand is 0.1 degrees per second (360 degrees divided by 3600 seconds), and the angular speed of the hour hand is 0.0083 degrees per second (360 degrees divided by 43200 seconds).

The angular speed of a smoothly running analog watch can be calculated for each hand as follows:

(a) The second hand completes one full rotation (360 degrees) in 60 seconds. Therefore, its angular speed is 360°/60s = 6°/s.

(b) The minute hand also completes one full rotation (360 degrees) in 60 minutes. So, its angular speed is 360°/(60min × 60s/min) = 6°/min or 0.1°/s.

(c) The hour hand completes one full rotation (360 degrees) in 12 hours. Thus, its angular speed is 360°/(12h × 60min/h × 60s/min) = 0.5°/min or 1/120°/s.

In summary: second hand's angular speed is 6°/s, minute hand's angular speed is 0.1°/s, and hour hand's angular speed is 1/120°/s.

Angular speed refers to the rate at which an object rotates around an axis or point, usually measured in radians per second or degrees per second. It is a measure of how fast an object is spinning.Angular speed can be calculated by dividing the angular displacement (the change in angle) by the time taken to make that displacement. The formula for angular speed is:

Angular speed = angular displacement / timewhere angular displacement is measured in radians or degrees, and time is measured in seconds.Angular speed is related to linear speed through the radius of rotation. This is because an object rotating at a constant speed will have a higher linear speed if it is rotating around a larger radius. The formula for linear speed is:

Linear speed = angular speed x radius

where radius is the distance from the axis of rotation to a point on the object.

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The region (A to E) along the horizontal axis where a point exists at which the net electric field is zero is point C.

An electric field refers to the physical field surrounding electrically charged particles which exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. It is defined as the electric force per unit charge. The field direction is taken as the direction of the force it would exert on a positive test charge. The direction of the electric field is always away from the positive charge and towards the negative charge. As seen in the diagram, both positive charges are equidistant from region C, and the strength of charges of the particle is the same in magnitude but opposite in direction, so the net electric field of both charges will be zero in region C.

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Since F₁ is directed towards the south and F₂ is directed towards the east, we can use the Pythagorean theorem to find the magnitude of the net force:

 F = √(F₁² + F₂²)

The magnitude of the net electrostatic force on the test charge in newtons is given by the formula: F= k(q1q2)/r²

where k is Coulomb's constant, q1 is the charge on particle a, q2 is the charge on particle b, and r is the distance between the test charge and the other two charges.

Using the given values, we can find the magnitude of the net electrostatic force on the test charge as follows: F₁

= k(2e)(-2e)/(0.0200m)²F₂

= k(2e)(3e)/(0.0200m)²

The net force is obtained by taking the vector sum of F₁ and F₂.

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The mass of the beam, given that the beam is balanced is 400 g

First, we shall re-conctruct the diagram given to better understand what we are looking for. Please see attached photo.

In the attached photo,

Note: The mass of the beam act at the centre of the beam

Now, we shall determine the mass of the beam as follow:

Anti-clock wise moment = Clock wise moment

200 × 20 = M × 10

4000 = M × 10

Divide both sides by 10

M = 4000 / 10

M = 400 g

Thus, from the above calculation, we can conclude that the mass of the beam is 400 g

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Answer:

Functions of the Cardiovascular System:

Knowing the functions of the cardiovascular system and the parts of the body that are part of it is critical in understanding the physiology of the human body. With its complex pathways of veins, arteries, and capillaries, the cardiovascular system keeps life pumping through you. The heart, blood vessels, and blood help to transport vital nutrients throughout the body as well as remove metabolic waste. They also help to protect the body and regulate body temperature.

The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions:

Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).

Protection of the body by white blood cells, antibodies, and complement proteins that circulate in the blood and defend the body against foreign microbes and toxins. Clotting mechanisms are also present that protect the body from blood loss after injuries.

Regulation of body temperature, fluid pH, and water content of cells.

Answer:

In order to minimize the uncertainty in the period, we measured the time for the pendulum to make 20 oscillations, and divided that time by 20

Explanation:

Answer:

The balls in Pair 2 have a greater mass than the balls in pair 1.

Explanation:

I took the test.

Answer:

mechanical wave -> a wave that requires a medium through which to travel

wave -> a disturbance that transfers energy from one place to another place

medium -> the matter that waves flow through

Answer:

Medium - The matter that waves flow through

Mechanical wave - A wave that requires a medium through which to travel

Wave - A disturbance that transfers energy from place to another

.

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Half-wave rectified power is obtained by placing a diode in one of the AC power lines.

A diode is an electronic component that allows current to flow in only one direction while blocking it in the opposite direction. By placing a diode in one of the AC power lines, it allows current to flow during half of the AC cycle while blocking it during the other half. This results in half of the waveform being rectified or converted to a unidirectional current.

The rectified output obtained through this arrangement is known as half-wave rectified power. It is commonly used in certain applications where a pulsating DC output is sufficient, such as in some low-power devices or for simple battery charging.

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Answer:

The center of the retrograde motion occurs at the planet's opposition which is when it is exactly opposite the Sun.

Explanation:

Answer:

1200

Explanation:

a = 1.5 m/s2

F = 1800N

M =?

F = Ma

M = F/a = 1800/1.5 = 1200Kg