IP A convex lens (f = 19.2 cm ) is placed 10.0 cm in front of a plane mirror. A matchstick is placed 25.0 cm in front of the lens, as shown in the figure. A)If you look through the lens toward the mirror, where will you see the image of the matchstick?(give DISTANCE) BWhat is the magnification of the image?

Answer:

volume = 30cm^3

Explanation:

Answer:All three states of matter (solid, liquid and gas) expand when heated. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Explanation:well I tried lol she just copied and pasted faster than I could

Answer:

C voltage

Explanation:

Voltage is the change in electric potential so basically current flows from high potential to low potential due to voltage.

Answer:

Option A. 500

Explanation:

From the question given, we obtained the following:

Numbers of home with pet dogs = 250

Percentage with pet dogs = 50%

Total number of homes =.?

Thus, we can obtain the total number of homes represented by the chart as follow:

Let T be the total number of Homes.

Number of homes with dog = percentage of homes with dog × total number

Numbers of home with pet dogs = 250

Percentage with pet dogs = 50%

Total number of homes = T

250 = 50% × T

Divide both side by 50%

T = 250 ÷ 50%

T = 250 ÷ 50/100

T = 250 × 100/50

T = 250 × 2

T = 500

Therefore, the total number of homes represented by the chart is 500.

The velocity midway between P and Q is 25 m. Based on the direction of the displacement, the average velocity might either be positive or negative.

We say an object has uniform acceleration if its speed (velocity) is growing at a constant pace. Acceleration happens at a steady rate. A car's acceleration is not uniform if it accelerates quickly, then slows down, and then accelerates again.

In terms of time, an object or particle's movement is expressed vectorially as velocity. The recognized measurement of velocity magnitude is the meter per second (m/s) (also known as speed). A different way to indicate velocity is in centimeters per second (cm/s).

The velocity midway between P and Q can be found using the average velocity formula. Average velocity is given by:

Average velocity = (Initial velocity + Final velocity) / 2

In this case, the initial velocity is 20 m/s and the final velocity is 30 m/s. Therefore, the average velocity is:

Average velocity = (20 m/s + 30 m/s) / 2 = 25 m/s

So the velocity midway between P and Q is 25 m/s.

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Answer:

They will crash with the force of 6,000N

Explanation:

Force is equal to mass time acceleration. When we multiply 200 kg, the mass, and 30 m/s2, the acceleration, the answer is 6,000.

Paula is investigating the electrical conductivity of various materials, which falls under the category of electromagnetism in the field of physics.

The division of physics known as the  electromagnetism studies  aelectromagnetic force that exists between electrically charged particles. One of the four fundamental forces, the electromagnetic force, produces electromagnetic fields such as magnetic, electric, and optical fields.

An electromechanical generator's internal field serves as an illustration. Electric and magnetic fields that are quickly varying travel as waves and make up electromagnetic waves. When an electrically charged object or magnet accelerates, electromagnetic waves are released. Light is the common name for these waves.

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The angular acceleration of the carnival ride is approximately -0.33 rad/s² (rounded to two significant digits).

Angular acceleration is defined as the rate of change of angular velocity with respect to time. It is measured in radians per second squared. In this problem, the carnival ride initially rotates counterclockwise at a rate of 2.0 radians per second and comes to rest over an angular displacement of 6.0 radians with a constant acceleration.

To find the angular acceleration of the carnival ride, we can use the following equation:

ω² = ω₀² + 2αθ

where ω is the final angular velocity (0 rad/s since the ride comes to rest), ω₀ is the initial angular velocity (2.0 rad/s, counterclockwise), α is the angular acceleration, and θ is the angular displacement (6.0 rad, counterclockwise).

Since counterclockwise rotation is considered positive in the given coordinate system, we have:

0² = (2.0 rad/s)² + 2α(6.0 rad)

Rearranging to solve for α:

α = - (2.0 rad/s)² / (2 × 6.0 rad)

α = - 4.0 / 12.0 = -0.33 rad/s²

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Answer:

80 Percent

Explanation:

E=energy output/energy input×100

E=8000/10000×100

E=0.8×100

E=80 percent.

Mark brianliest if my answer suit your question

If the machine put, in 8000 J, and the user puts 10,000 J of work then the efficiency of the machine will be equal to 80%.

Work is a physics term used to describe the transfer of energy that takes place when an object changes above a distance because of an external force, at least some of which is given in the vector of the dislocation. The element of the force acting all along the path multiplied by the length of the path can be used to calculate work if the force is constant.

Mathematically, this idea is expressed as W = fd, where W is the effort and f is the force multiplied by d, the distance. Work is completed whenever the force is applied at an angle with about the displacement.

As per the data provided in the question,

Total input energy = 10,000 J

Total output energy = 8,000 J

Then, the efficiency (η) of the machine will be,

η = (output energy/input energy) × 100

η = 8000/10000 × 100

η = 80%.

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The speed at which the motor will run on no-load can be determined by using the concept of the motor's input and output power.
Given:
Full-load power (output power) = 7.5 kW
Full-load efficiency = 86% = 0.86
Total no-load input power = 600 W
First, we can calculate the full-load input power using the efficiency formula:
Full-load input power = Full-load power / Full-load efficiency
Full-load input power = 7.5 kW / 0.86 = 8.72 kW
Now, we can determine the ratio of the no-load input power to the full-load input power:
Power ratio = Total no-load input power / Full-load input power
Power ratio = 600 W / 8.72 kW = 0.0688
Since power is directly proportional to the speed of the motor, we ca
calculate the speed on no-load using the power ratio
No-load speed = Full-load speed * √(Power ratio)
No-load speed = 1,200 r/min * √(0.0688) ≈ 292.78 r/min
Therefore, the motor will run at approximately 292.78 r/min on no-load.
1.2.2 To reduce the speed to 1,000 r/min when giving full-load torque, we need to add a resistance in the armature circuit. The speed of the motor is inversely proportional to the armature circuit resistance.
Given:
Full-load speed = 1,200 r/min
Target speed = 1,000 r/min
Using the speed ratio formula:
Speed ratio = Full-load speed / Target speed
Speed ratio = 1,200 r/min / 1,000 r/min = 1.2
Since the speed is inversely proportional to the resistance, we can calculate the resistance ratio:
Resistance ratio = 1 / Speed ratio
Resistance ratio = 1 / 1.2 ≈ 0.833
Now, we can calculate the required resistance to be added in the armature circuit:
Required resistance = Armature circuit resistance * Resistance ratio
Required resistance = 0.3 ohm * 0.833 ≈ 0.25 ohm
Therefore, a resistance of approximately 0.25 ohm needs to be added in the armature circuit to reduce the speed to 1,000 r/min when giving full-load torque, assuming the flux is proportional to the field current.

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Explanation:

So This problem doesn’t get anywhere near the precision required that would require consideration of relativistic effects (simple relativity) and thus, they can be ignored. They wouldn’t change the answer within the precision you’re going to use to calculate it.

Note that, Newton’s “Laws” motion are a misnomer. The science community quit calling things “Law(s) of . . . [fill in blank]” over a century ago. They’re not really immutable as Einstein’s “Theory” of Special Relativity turned Newtonian mechanics on its ear. So Everything - all mathematical models used in Physics - they are considered as provisional. They’re good as long as they are consistent, fit observations, and predict things that haven’t been observed yet properly when they are eventually observed. But In other words, they’re not just descriptive models, they’re also predictive as well.

Due to Newton’s “Laws” motion were close, extremely close, so close that they work in nearly all practical, real-world applications, but they weren’t quite complete yet. You need to get past Newtonian Mechanics too - his three “laws” of motion and his “law” of gravity before you launch into special or general relativity and their effects, Thus, you’re a long way away from that.

If a 3,000kg car is pulled with a force of 11,000 N to the right causing it to accelerate at 3 m/s², then the force of friction (F) acting on the car would be 2000 Newtons.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

As given in the problem If a 3,000kg car is pulled with a force of 11,000 N to the right causing it to accelerate at 3 m/s²,

The net force acting on the car = 3000 ×3

                                                    = 9000 Newtons

The friction force = 11000 - 9000

                             = 2000 Newtons

Thus, the friction force acting on the car would be 2000 Newtons.

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Answer:

B:O

Explanation:

As acceleration is the rate of change of velocity with time, if velocity is uniform, there will be no change in it and acceleration will be zero.

The water budget equation for the Creek drainage basin is: Precipitation = Stream discharge + Evapotranspiration ± Change in storage.

To develop the water budget equation for this problem, we need to account for the inputs and outputs of water in the Creek drainage basin. The water budget equation can be expressed as,

P = Q + ET ± ΔS

P = Precipitation input (mm)

Q = Stream discharge (m³/s)

ET = Evapotranspiration (mm)

ΔS = Change in storage (mm)

First, let's convert the units of the given values,

Precipitation input (P) = 550 mm

Stream discharge (Q) = 1.8 m³/s

Now, let's determine the evapotranspiration (ET) and change in storage (ΔS) terms. However, the problem doesn't provide information about ET, so we cannot calculate it accurately. The problem doesn't provide information about ΔS, so we cannot calculate it accurately.

Given these limitations, we can write the simplified water budget equation for this problem,

550 mm = 1.8 m³/s + ET ± ΔS

Please note that without information about evapotranspiration and changes in storage, we cannot fully determine the water budget for the Creek drainage basin.

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RS is a composition of rotation and reflection in the Euclidean plane E². The precise description of RS depends on the specific properties of the rotation R and reflection S.

In general, if R and S have the same axis or line of symmetry, the composition RS results in a translation. If R and S have intersecting lines of symmetry, RS yields a glide reflection. If R and S have perpendicular lines of symmetry, RS produces a rotation.

It is important to consider special cases, such as parallel lines of symmetry, coinciding axes, or perpendicular lines of reflection, as they may lead to different outcomes. The classification of isometries in E² involves understanding how rotations and reflections combine to create different transformations in the plane.

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Answer: Your weight alone can determine the percentages of your body's composition

Explanation:

C. Your weight alone can determine the percentages of your body's composition.

Body composition analysis is the assessment of the proportion of fat to fat-free mass in your body.

Performing Body Composition Assessment will tell you your own body's unique makeup and help you identify areas to work on to improve your overall health and wellness.

Thus, the statement that is NOT true about the Body Composition Assessment is your weight alone can determine the percentages of your body's composition.

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Answer:

v = 12.8 m/s

Explanation:

Applying the law of conservation of energy:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = mass of baseball = 149 kg

m₂ = mass of catcher = 57 kg

u₁ = initial speed of ball = 17.7 m/s

u₂ = initial speed of catcher = 0 m/s

v₁ = v₂ = v = final speed of ball and the final speed of catcher = ?

both are same because ball is in hands of cathcer in the final state.

Therefore,

\((149\ kg)(17.7\ m/s)+(57\ kg)(0\ m/s)=(149\ kg)(v)+(57\ kg)(v)\\\\v = \frac{2637.3\ kgm/s}{206\ kg}\)

v = 12.8 m/s

The sun produces 3.6 x 10^26 joules of energy every second

How to calculate power ?

Power is a measure of the rate at which work is done or energy is transferred. It is defined as the amount of energy transferred per unit time. The formula for calculating power is P = E/t, where P is power, E is energy, and t is time. In other words, power is the energy consumed or produced per unit time. For example, if a machine consumes 1000 Joules of energy in 10 seconds, its power output would be 100 Joules per second (P = 1000 J / 10 s). The unit of power is the Watt (W), which is equivalent to one Joule per second (1 W = 1 J/s). Power is a crucial concept in physics and engineering, as it is used to measure the efficiency of machines and energy systems.

To calculate the power output of the sun, we can use the formula E=mc^2, where E is the energy released, m is the mass converted to energy, and c is the speed of light.

Given that the sun converts 4 million tons of matter into energy every second, we can find the energy released per second as follows:

m = 4 million tons = 4 x 10^9 kg (1 ton = 1000 kg)

c = 3 x 10^8 m/s (speed of light)

E = mc^2 = (4 x 10^9 kg) x (3 x 10^8 m/s)^2 = 3.6 x 10^26 J/s

This is the power output of the sun, which is also known as its luminosity. Therefore, the sun produces 3.6 x 10^26 joules of energy every second

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Given, Speed of the sound, v=675 m/s

The wavelength of the wave, λ=15 m

Relation between speed, wavelength, and frequency of a wave is given by

Where f is the frequency of the sound.

On substituting the known values,

Which gives us,

Therefore the frequency of the sound in the given medium is 45 Hz.

If a baseball player swings his bat and hits a ball. According to Newton’s third law of motion, the ball’s force on the bat is a reaction to the bat's force on the ball, therefore the correct answer is option A.

Newton's third law of motion state that for every action force there exists a complementary reaction force that balances it. In other words, one can say that the action and reaction force pair exists in the pair with an equal magnitude but are opposite in the direction.

As given in the problem a baseball player swings his bat and hits a ball.

As per the third law of motion for every action there is an equal and opposite reaction, for the given problem statement, the ball’s force on the bat is a reaction to the bat's force on the ball,

Thus , the ball’s force on the bat is a reaction to the bat's force on the ball, therefore the correct answer is option A.

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Answer:

  a. 125 kJ

Explanation:

Her total energy is the same as the potential energy she had at the top of the hill:

  PE = mgh

  = (52 kg)(9.8 m/s^2)(245 m) = 124,852 J

  ≈ 125 kJ . . . . matches choice A

_____

After skiing down 112 m, some of her initial energy is converted to kinetic energy, and some remains as potential energy. We assume the ski slope is essentially frictionless, and air resistance is negligible.

The kinetic energy of the proton when it reaches point B is +1.92x10^-7 J (option D) based on the electric potential difference between A and B in the given electric field.

When the proton moves against the electric field from point A to point B, its potential energy decreases and is converted into kinetic energy. The electric potential difference (ΔV) between A and B can be calculated as ΔV = -E * d, where E is the electric field magnitude and d is the distance between A and B. Plugging in the values, ΔV = -95 N/C * 0.0075 m = -0.7125 V. As the proton starts from rest, its initial potential energy is zero. Therefore, the final kinetic energy is equal to the magnitude of the electric potential difference, which is 0.7125 J (option D).

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The Jovian planets are formed from materials different from the terrestrial planets for the reason that gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust."

A Jovian planet, also known as a gas giant, is a huge planet that has a primarily gaseous composition. The Jovian planets include Jupiter, Saturn, Uranus, and Neptune. They are primarily made up of hydrogen and helium, and they have enormous atmospheres.Jovian planets are formed farther away from the heat of the Sun, so they are formed from lighter-weight nebulae "dust." Terrestrial planets, on the other hand, are formed nearer to the Sun, so they are formed from heavier-weight nebulae "dust." The density of the materials that make up the Jovian planets is lower than that of the terrestrial planets due to this. This means that the Jovian planets have lower densities and a greater volume than the terrestrial planets.

Hence, the correct option is d. Gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust."

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Answer:

0.59 seconds

Explanation:

To find the time it takes for a tennis ball to reach the ground and bounce back to a height of 7 meters, we need to use the formula for the time it takes an object to fall to the ground.

The formula for the time it takes an object to fall to the ground is given by:

t = sqrt(2 * d / g)

where t is the time it takes the object to fall, d is the distance the object falls, and g is the acceleration due to gravity.

In this case, we are given that the height from which the tennis ball is dropped is 3 meters, the height to which the ball bounces is 7 meters, and the acceleration due to gravity is 9.8 m/s^2. We can use these values to solve for the time it takes for the ball to reach the ground and bounce back to a height of 7 meters.

First, we need to calculate the distance the ball falls. The distance the ball falls is equal to the difference between the height from which the ball is dropped and the height to which the ball bounces:

d = H1 - H2

d = 3 - 7

d = -4

Next, we can use the formula for the time it takes an object to fall to the ground to solve for the time it takes for the ball to reach the ground and bounce back to a height of 7 meters:

t = sqrt(2 * d / g)

t = sqrt(2 * -4 / 9.8)

t = 0.59 seconds

Therefore, it takes 0.59 seconds for the tennis ball to reach the ground and bounce back to a height of 7 meters.

Increased gravitational pull is not one of these effects.

Increased gravitational pull is not one of these effects.

Coronal Mass Ejections (CMEs) from the Sun can indeed have various serious effects on or near the Earth. However, one of the following options is not typically associated with the effects of CMEs:

While CMEs can cause significant disturbances in space weather and have several impacts on Earth, such as geomagnetic storms, disruptions to satellite communications, and power grid fluctuations, they do not directly affect the gravitational pull experienced on Earth.

Gravitational pull is primarily determined by the mass and distance of celestial bodies, and CMEs do not alter these factors significantly.

Therefore, Increased gravitational pull is not one of these effects.

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Complete question is here:

Solar flares and Coronal Mass Ejections from the Sun have many effects on or near the Earth. Which of the following is NOT one of these effects?

they disrupt the electronics of satellites

they cause power surges and power outages

they cause increases in the Aurora Borealis

they cause cancer risk for people on Earth exposed to the high energy radiation they emit

they cause communications blackouts

Answer:

A. 28 m/s

B. 5.72 s

Explanation:

The following data were obtained from the question:

Maximum height (h) = 40 m

Acceleration due to gravity (g) = 9.8 m/s²

A. Determination of the initial velocity.

Maximum height (h) = 40 m

Acceleration due to gravity (g) = 9.8 m/s²

Velocity at maximum height (v) = 0 m/s

Initial velocity (u) =.?

v² = u² – 2gh (Ball is going against gravity)

0² = u² – (2 × 9.8 × 40)

0 = u² – 784

Collect like terms

0 + 784 = u²

784 = u²

Take the square root of both side

u = √784

u = 28 m/s

Thus, the ball was kicked with a velocity of 28 m/s

B. Determination of the time of flight.

We'll begin by calculating the time taken to reach the maximum height. This can be obtained as follow:

Velocity at maximum height (v) = 0 m/s

Initial velocity (u) = 28 m/s

Time taken to reach the maximum height (t) =?

v = u – gt (Ball is going against gravity)

0 = 28 – 9.8t

Rearrange

0 + 9.8t = 28

9.8t = 28

Divide both side by 9.8

t = 28/9.8

t = 2.86 s

Finally, we shall determine the the time of flight as follow:

Time taken to reach the maximum height (t) = 2.86 s

Time of flight (T) =?

T = 2t

T = 2 × 2.86

T = 5.72 s

Therefore, the time of flight for the ball is 5.72 s

Answer:

when waterways are polluted it affects all forms of life in the area - including us

expression:

for example when Lakes streams and ponds are polluted it can kill or harsh fish and other Wildlife that lives there!

hope that helps !

The correct answer is d) The anode is the cobalt electrode and the cell potential is +0.39 V. In a standard lead-cobalt cell, the anode is the cobalt electrode and the cell potential is +0.39 V.

This is because the cobalt electrode has a higher reduction potential than the lead electrode, meaning that electrons will flow from the cobalt to the lead electrode. The cell potential is the difference in the reduction potentials of the two electrodes, and since the cobalt electrode has a higher reduction potential, the cell potential is positive. The cell potential is measured in volts, and in this case it is +0.39 V.

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Answer:

  85.2 N

Explanation:

You want to know your weight if the Earth were 3 times as massive and had 5 times the present radius. Your weight is 710 N.

Your weight is proportional to the mass of the Earth and the square of the radius between your mass and the center of the Earth. The revised dimensions of the earth would multiply your weight by ...

  W = k(M/r²) = 710 N

  W' = k((3M)/(5r)²) = k(M/r²)(3/25) = (710 N)(3/25) = 82.5 N

Your weight would be 82.5 N.

Answer:

Energy Lost for group A's car = 0.687 J

Energy Lost for group B's car = 0.55 J

Explanation:

The exact question is as follows :

Given - The energy of an object can be converted to heat due to the friction of the car on the hill. The difference between the potential energy of the car and its kinetic energy at the bottom of the hill equals the energy lost due to friction.

To find - How much energy is lost due to heat for group A's car ?

              How much for Group B's car ?

Solution -

We know that,

GPE = 1 Joule (Potential Energy)

Now,

For Group A -

Energy Lost = GPE - KE

                    = 1 J - 0.313 J

                    = 0.687 J

So,

Energy Lost for group A's car = 0.687 J

Now,

For Group B -

Energy Lost = GPE - KE

                    = 1 J - 0.45 J

                    = 0.55 J

So,

Energy Lost for group B's car = 0.55 J

a) The isocost curve equation is G = (20000 - 100C)/500. b) The isocost curve equation is G = (30000 - 100c)/500. c) The isocost curve equation is G = (20000 - 100C)/375. d)  The isocost curve equation is G = (20000 - 120C)/500.

To draw the isocost curve showing the different combinations of gas and coal, we need to use the cost per unit values for coal and gas, as well as the given expenditure (TC) and the changes in expenditure or prices.

Let's denote the quantity of coal as C and the quantity of gas as G. The cost per unit of coal is 100, and the cost per unit of gas is 500.

(a) Initial expenditure (TC) of 20000:

To find the combinations of gas and coal that can be purchased with an initial expenditure of 20000, we can use the following isocost equation

TC = 100C + 500G

We can rearrange the equation to solve for G in terms of C

G = (TC - 100C) / 500

Now we can plot the isocost curve with TC = 20000 using the equation above.

(b) Expenditure (TC) increases by 50%

If the expenditure increases by 50%, the new expenditure (TC_new) becomes 1.5 × TC = 1.5 × 20000 = 30000.

We can use the same isocost equation as before, but with the new expenditure value:

TC_new = 100C + 500G

Rearranging the equation to solve for G

G = (TC_new - 100C) / 500

Now we can plot the isocost curve with TC_new = 30000.

(c) Gas price reduced by 25%:

If the gas price is reduced by 25%, the new cost per unit of gas (Gas_new) becomes 0.75 × 500 = 375.

We can use the original isocost equation, but with the new cost per unit value:

TC = 100C + 375G

Rearranging the equation to solve for G

G = (TC - 100C) / 375

Now we can plot the isocost curve with the reduced gas price.

(d) Coal price rises by 20%

If the coal price rises by 20%, the new cost per unit of coal (Coal_new) becomes 1.2 × 100 = 120.

We can use the original isocost equation, but with the new cost per unit value:

TC = 120C + 500G

Rearranging the equation to solve for G:

G = (TC - 120C) / 500

Now we can plot the isocost curve with the increased coal price.

By plotting these isocost curves on a graph with G on the y-axis and C on the x-axis, we can visualize the different combinations of gas and coal that can be purchased at the given expenditures or price changes.

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