why will a volleyball held beneath the surface of water have more buoyant force than if it is floating

The distance between the object and the focal point of the objective is 0.18 mm. Option 2 is correct.

To solve this problem, we can use the thin lens equation:

[tex]\frac{1}{f} = \frac{1}{do} +\frac{1}{di}[/tex]

where f is the focal length of the lens, do is the distance between the object and the lens, and di is the distance between the lens and the image.

We know that the focal length of the objective is 4.00 mm, and the focal length of the eyepiece is 25.0 mm. We also know that the image produced by the objective is 30 times the size of the object. Finally, we know that the final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm.

Using these values and some algebra, we can solve for do:

1/4 = 1/do + 1/(30*25)

1/do = 0.0008 - 0.00133

1/do = -0.00053

do = -1.89 mm

Since the object is located in front of the lens, we know that the distance between the object and the focal point of the objective is positive. Therefore, we can use the relationship do = f/(1 - m) to find the distance:

do = 4.00 mm / (1 - 30)

do = 0.18 mm

As a result, the distance between the object and the objective's focus point is 0.18 mm. Option 2 is correct.

The complete question is

The objective and the eyepiece of a microscope have focal lengths of 4.00 mm and 25.0 mm, respectively. the objective produces a real image 30 times the size of the object. the final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm. what is the distance between the object and the focal point of the objective?

Options:

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Therefore, it would take approximately 2.88 million seconds, or around 32.5 days, to travel to Proxima Centauri at a speed of 50,000 km/hr.

Nearly 40 trillion kilometers, or 4.4 light-years, separate us from Alpha Centauri. The NASA-Germany Helios probes, the fastest spacecraft to date to be propelled into orbit, travelled at a speed of 250,000 kilometres per hour.

We need to convert this speed to a more useful measure, such as kilometres per second (km/s), to find the time it would take a spacecraft travelling at 50,000 km/hr to reach Proxima Centauri.

1 hour = 60 minutes

1 minute = 60 seconds

Therefore, 1 hour = 60 x 60 = 3600 seconds

So, 50,000 km/hr = (50,000 km / 3600 sec) = 13.89 km/s

We must know the distance in kilometres in order to determine the estimated travel duration to Proxima Centauri. The distance to Proxima Centauri is calculated as follows given that 1 light-year is equal to roughly 9.46 trillion kilometres:

4.24 light-years x 9.46 trillion km/light-year = 40.003 trillion km

Using the formula

time = distance / speed

we can calculate the travel time:

time = 40.003 trillion km / 13.89 km/s = 2.88 million seconds

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At the part of the bungee jump where all three types of energy (potential energy, kinetic energy, and elastic potential energy) are non-zero is when the jumper is falling and the bungee cord starts to stretch but has not yet reached its maximum extension.



1. The jumper starts with potential energy (height) and zero kinetic energy (not moving) and zero elastic potential energy (cord not stretched).
2. As the jumper falls, the potential energy decreases, and kinetic energy increases (due to acceleration), while the elastic potential energy is still zero (cord not stretched yet).
3. When the bungee cord starts to stretch, all three types of energy are non-zero: potential energy (some height remains), kinetic energy (still moving), and elastic potential energy (cord stretching).
4. At the maximum extension of the cord, kinetic energy becomes zero (momentarily stopped), potential energy is still non-zero (height), and elastic potential energy is at its maximum (cord fully stretched).

Therefore, the three types of energy are potential energy, kinetic energy, and elastic potential energy.

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The earth's surface encounters incoming solar radiation at a rate of 184 w/m2 and, on average, reflects 12% back into outer space. The average emissivity of the Earth's surface is approximately 0.88.

Emissivity refers to the ability of a surface to emit thermal radiation. A perfect emitter, for example, would have an emissivity of 1.0, whereas a perfect reflector would have an emissivity of 0.0.

According to the given problem, the Earth's surface encounters incoming solar radiation at a rate of 184 W/m2, with 12% reflected back into outer space.

As a result, 88% of the incoming solar radiation is absorbed by the Earth's surface, and therefore its emissivity is approximately 0.88.

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Answer: mechanical?

Explanation:

The heat added from the hot reservoir (Qh) cannot be calculated without specific values for temperatures or heat quantities.

To calculate the heat added from the hot reservoir (Qh) in a heat engine, you need the temperatures of the hot (Th) and cold (Tc) reservoirs, and either the work done (W) or the heat rejected to the cold reservoir (Qc).

Using the provided information, you can apply the formula for the efficiency of a heat engine: efficiency = W/Qh = 1 - Qc/Qh.

Rearrange the equation to find Qh and plug in the known values. Once you've done this, you can calculate the heat added from the hot reservoir in joules.

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(a) The change in kinetic energy is, 269,200 J

(b) The magnitude of the change in momentum is, 20,300 kg m/s

The change in the truck's kinetic energy can be calculated using the formula ΔK = Kf - Ki, where Kf is the final kinetic energy and Ki is the initial kinetic energy. Since kinetic energy is proportional to the square of velocity, we can calculate the initial and final kinetic energies in terms of velocity:

Ki = (1/2)mv1² = (1/2)(2150 kg)(8.61 m/s)^2 = 78,400 J

Kf = (1/2)mv2² = (1/2)(2150 kg)(18.06 m/s)^2 = 347,600 J

Therefore, the change in kinetic energy is:

ΔK = Kf - Ki = 347,600 J - 78,400 J = 269,200 J

The magnitude of the change in momentum can be calculated using the formula Δp = pf - pi, where pf is the final momentum and pi is the initial momentum. Since momentum is proportional to velocity, we can calculate the initial and final momenta in terms of velocity,

pi = mv1 = (2150 kg)(8.61 m/s) = 18,500 kg m/s

pf = mv2 = (2150 kg)(18.06 m/s) = 38,800 kg m/s

Therefore, the magnitude of the change in momentum is:

Δp = pf - pi = 38,800 kg m/s - 18,500 kg m/s = 20,300 kg m/s

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Answer: Reflection involves a change in direction of waves when they bounce off a barrier.

Explanation: Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.

A 150-lb man carries a 25-lb can of paint up a helical staircase that encircles a silo with radius 30 ft. If the silo is 120 ft high and the man makes exactly three complete revolutions, the work done by the man against gravity in climbing to the top is 48,832 ft-lb.

The work done by a person in lifting an object against gravity is given by the formula W = F × d where W is the work done, F is the force applied, and d is the distance moved in the direction of the force. Since the man is moving up the helical staircase, the distance moved by him is equal to the height of the silo, which is 120 ft. The force applied by the man is equal to the weight of the man and the can of paint. This is given by F = 150 + 25 = 175 lb. The man makes exactly three complete revolutions, which means that the vertical distance covered by him is three times the height of the silo. This is equal to 3 × 120 ft = 360 ft. However, the vertical component of this distance is equal to the height of the silo, which is 120 ft. This means that the man moves horizontally by a distance of 360 − 120 = 240 ft. This distance is covered by the man in moving around the silo. The circumference of the silo is given by 2πr, where r is the radius of the silo. Therefore, the circumference of the silo is given by 2π × 30 ft = 60π ft. The man makes three complete revolutions, which means that he moves a horizontal distance of 3 × 60π ft = 180π ft. Therefore, the total distance moved by the man is given by d = √(120² + 180π²) ft ≈ 372.77 ft. Now, substituting the values of F and d in the formula for work, we getW = F × d= 175 lb × 372.77 ft= 65,216.75 ft-lbHowever, the man is carrying the can of paint in one hand. This means that he is doing work against gravity not only for himself but also for the can of paint. Therefore, the work done against gravity by the man for himself is 65,216.75 ft-lb, and the work done against gravity for the can of paint isW = 25 lb × 120 ft= 3,000 ft-lbTherefore, the total work done against gravity is given by 65,216.75 ft-lb + 3,000 ft-lb = 68,216.75 ft-lb ≈ 48,832 ft-lb.

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Answer:

Most probably mass and volume

Explanation:

i dont think you can really measure it from its color i dont think measurements work that way lol. temperature cant be the option because all of them are likely to be in the same condition and time is just an absurd way to measure a object

For the solar cooker project, the two measurements that students should make to determine the dependent variable are: temperature and time.

Two measurements that students should make to determine the dependent variable are :

Temperature: The students should measure the temperature of the food being cooked at different times of day and under different conditions, such as with or without insulation, with or without reflective materials, and so on. The temperature would be dependent variable because it is directly related to the rate of cooking. The higher the temperature, then faster the food will cook.

Time: The students should measure the time it takes to cook the food under different conditions. The time would be a secondary dependent variable because it is also directly related to rate of cooking. The faster the food cooks, the shorter the cooking time will be.

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When alcohol is used to make a barometer at normal atmospheric pressure, the height of the alcohol column would be higher than the height of the mercury column.

A barometer is a tool used for measuring atmospheric pressure, and it is commonly used in weather prediction. Evangelista Torricelli, an Italian scientist, invented the instrument in 1643.

The first barometer used mercury, which rises in a glass tube according to the air pressure, making the height of the column proportional to the atmospheric pressure.

Alcohol barometers are not as accurate as mercury barometers due to the lower density of alcohol compared to mercury. If a barometer is made with alcohol instead of mercury, the height of the alcohol column would be greater than that of a mercury column due to alcohol's lower density, which is approximately 1/13.6 that of mercury.

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Soot is a dark-colored substance made up of tiny particles of carbon. When soot lands on snow and ice, it darkens the surfaces and decreases the albedo, or reflectivity, of that surface.

This means that less sunlight is reflected back into the atmosphere, and more is absorbed by the snow and ice. This absorption of thermal energy causes the snow and ice to melt more quickly.

Additionally, the soot particles act like tiny heat absorbers and further increase the temperature of the snow and ice. This can further speed up the melting process and contribute to a decrease in global snow and ice cover. In turn, this can have serious environmental consequences, such as sea level rise and increased global temperatures.

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You can light up the bulb without moving any coil by using AC (Alternating Current). This is because AC voltage constantly changes polarity and direction, creating an alternating magnetic field around the coil.

You can manage to light up the bulb without moving any coil using AC current. The reason for this is that the AC current is constantly changing direction, which causes the magnetic field to expand and collapse rapidly.

This, in turn, generates a voltage in the coil, which can be used to light up the bulb without any movement of the coil.A direct current (DC) is a one-way electrical flow from positive to negative.

Since the direction of the flow is fixed, it does not cause any magnetic field to form or collapse rapidly, making it impossible to light up a bulb without moving the coil. As a result, we can only light up a bulb without moving the coil using AC current.

This changing magnetic field induces a voltage in the coil, which can then light up the bulb without the need for any physical movement of the coil.

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Humans radiate excess energy in the form of infrared radiation. The radiation emitted in the highest amount has a wavelength of 9.50 micrometers. This wavelength is associated with a frequency of 3.16 x 10^13 Hz.

How is frequency related to wavelength and energy? Frequency is inversely proportional to wavelength, according to the equation c = λν, where c is the speed of light, λ is the wavelength, and ν is the frequency. As a result, if the wavelength of a wave increases, the frequency decreases, and if the wavelength decreases, the frequency increases. In general, the energy of a wave is proportional to its frequency. This suggests that if the frequency of a wave is higher, its energy will be higher, and if its frequency is lower, its energy will be lower.

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Answer: f =  0.6 per sec

54 cycles in 90 sec

Explanation:

This τmax = N(IL²/16)B  torque is proportional to the number of turns in the loop, the current in the wire, the area of the loop, and the magnetic field. So to maximize the torque.

The maximum torque that can be obtained in a magnetic field is when the loop is perpendicular to the magnetic field. In this case, the torque is given by:

τ = NABsinθ

where N is the number of turns in the loop, A is the area of the loop, B is the magnetic field, and θ is the angle between the normal to the loop and the direction of the magnetic field.

The total length of the wire is used to make the loop, so the length of each side of the loop is L/4, where L is the total length of the wire. The area of the loop is then:

A = (L/4)² = L²/16

The current in the wire is I, and the magnetic field is B, so the torque can be written as:

τ = N(IL²/16)Bsinθ

To maximize the torque, we want sinθ to be 1, so the loop should be perpendicular to the magnetic field.

Thus, the maximum torque is: τmax = N(IL²/16)B

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Between the Milky Way galaxy's nucleus and its outer border, our solar system is located about halfway.

The Milky Way galaxy has a width of about 100,000 light-years and is a barred spiral galaxy. It has a disc with spiral arms and a central bulge that is home to stars, gas, and dust.

One of the curving arms of the Milky Way galaxy, the Orion Arm contains our solar system. Our solar system is thought to be located approximately halfway between the Milky Way galaxy's center and its outer edge, at a distance of about 25,000 light-years.

Because our solar system is a component of the Milky Way galaxy, Option B is wrong. Option C is wrong because the Milky Way galaxy's center is not where our solar system is located.

Because there is no proof that our solar system is located further from the center of the Milky Way galaxy than any other solar system, Option D is false.

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the question is incomplete. complete question is

Which of the following statements about the location of our solar system is correct?

A. Our solar system is about halfway between the center of the Milky Way galaxy and its outer edge.

B. Our solar system is not in the Milky Way galaxy.

C. Our solar system is at the center of the Milky Way galaxy.

D. Our solar system is farther out in the Milky Way galaxy than any other solar system.

Using conservation of energy, the initial velocity of the puck at the bottom of the hill is 19.6 m/s.

Expecting the slope is a smooth bend, we can utilize preservation of energy to track down the underlying speed of the puck. Since there is no grating or air obstruction, the main powers following up on the puck are gravity and the typical power. Thusly, the absolute mechanical energy of the puck is saved.At the highest point of the slope, the puck has gravitational possible energy, which is changed over into active energy as it slides down the slope. At the lower part of the slope, the gravitational potential energy has been all changed over into motor energy, so we can compose:

mgh = (1/2)mv0^2

where m is the mass of the puck, g is the speed increase because of gravity, h is the level of the slope, and v0 is the underlying speed of the puck at the lower part of the slope.

Tackling for v0, we get:

v0 = sqrt(2gh)

Where sqrt addresses the square root capability.We can utilize the given distance of 7 m to track down the level of the slope:d = sqrt(h^2 + 49)

where d is the distance the puck lands from the foot of the bluff. Settling for h, we get:

h = sqrt(d^2 - 49)

Subbing this articulation for h into the situation for v0, we get:

v0 = sqrt(2g(sqrt(d^2 - 49)))

Where g is the speed increase because of gravity.Connecting the upsides of g = 9.8 m/s^2 and d = 7 m, we get:

v0 = sqrt(2 x 9.8 x sqrt(7^2 - 49)) = 19.6 m/s

In this way, the underlying speed of the puck at the lower part of the slope was 19.6 m/s.

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In RLC circuit the output omega L(t) represents the instantaneous energy stored in the inductor. It will be a function of time.

If a sinusoidal voltage is applied to the circuit, the energy stored in the inductor start to oscillates. It will start oscillating at the same frequency as the voltage.

The amplitude of the energy oscillations depends on the parameters of circuit and amplitude of the voltage. These parameters includes resistance, inductance, and capacitance.

So we can say that the output omega L(t) shows sinusoidal oscillations at a frequency of 3 Hz and an amplitude of 5. Now it would make sense for the given circuit parameters and voltage amplitude.

The waveform shape and the amplitude will depend on the specific circuit parameters. Also depend on the initial conditions.

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The required focal length of the camera in order to have a horizontal angle of view of 52° is approximately 27.2 mm.

To find the required focal length of the camera, we need to use the given information and the formula for angle of view. Here's a step-by-step explanation:
1. The maximum image size on the film occurs when the image height is equal to half the width of the film. So, the image height is 36 mm / 2 = 18 mm.
2. Since the image dimensions are 36 mm wide and 18 mm tall, we will focus on the horizontal angle of view, which is 52°.
3. The formula for the angle of view (α) is given by:
α = 2 * arctan (d / (2 * f))
where α is the angle of view, d is the image width, and f is the focal length.
4. We want to find the focal length (f) using the given angle of view (α) and the image width (d).

Rearrange the formula:
f = d / (2 * tan(α/2))

5. Plug in the values: α = 52° and d = 36 mm:
f = 36 / (2 * tan(52°/2))
6. Calculate the result:
f ≈ 27.2 mm
The required focal length of the camera in order to have a horizontal angle of view of 52° is approximately 27.2 mm.

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They both go in the same direction, thus their velocities will cancel out as they move in the same direction. then it would be calculated by subtracting the speed of X from the speed of Y, which would be 15km/hrs.

This is possible to calculate it by using a middle frame. The possible combination of a speeds is one way to put this into words. As stated, vAB = si le - visual basic is the angular acceleration equation.

A scalar difference between the velocities for two bodies is the concept of relative velocity. the speed of a body in relation to another that is thought to be at rest – compare relative motion. For instance, if a vehicle is moving in a righteous line at a consistent speed, it is possible toss & grab an object in movement.

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When two bodies contact each other without slipping and the points in contact move along different paths, the tangential components of acceleration will be different. This means that the bodies will have different accelerations along the tangential direction.

Tangential acceleration refers to the component of an object's acceleration that is parallel to the object's velocity vector. As an object moves, its velocity vector changes in direction, and thus the direction of its acceleration vector also changes.

The tangential acceleration is the part of this vector that is parallel to the velocity vector. It is also referred to as the longitudinal acceleration.

When two bodies make non-slip contact and the points of contact travel along distinct routes, the tangential components of acceleration diverge. This indicates that the bodies' accelerations will differ along the tangential direction.

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When a cold canned drink is left in a warmer room where its temperature rises as a result of heat transfer, this is an irreversible process. The correct option is the second option.

What is a reversible process?

A reversible process refers to any process that can be undone by reversing every step in the process, i.e. the system is taken back to its initial state. A process that is reversible, therefore, is a theoretical concept that serves as a baseline for evaluating the performance of real processes. Irreversible processes are those that occur when some energy is lost in the form of heat.

This type of process cannot be undone by reversing the process's steps. An example of an irreversible process is when a cold canned drink is left in a warmer room where its temperature rises as a result of heat transfer. The temperature difference between the drink and the surrounding air leads to a change in the drink's state from cold to warm, which cannot be undone by reversing the steps taken by the drink.

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Explain in 200 words

The Geocentric Theory, which cannot explain backward, is Model B.

Because its proponents were unable to explain why the relative positions of the stars appeared to stay the same despite the Earth's changing perspectives as it rotated around the Sun, The solar system's heliocentric, or Sun-centered, model was never generally accepted.

Instead of Earth, as was previously thought to be the case according to the geocentric model, the heliocentric model puts the Sun at the core of the solar system. Our greater knowledge of astronomy was built on this advancement, which brought us closer to the true nature of the solar system and the universe.

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The angular magnification of the telescope is 7.5. The angular magnification of the telescope can be calculated using the following formula:

Magnification = -(f_objective / f_eyepiece) where f_objective is the focal length of the objective lens and f_eyepiece is the focal length of the eyepiece. Plugging in the given values, we get: Magnification = -(60 cm / 8.0 cm) = -7.5.

However, the magnification is negative because the telescope produces an inverted image. To get the absolute value of the magnification, we take the absolute value of the answer: |Magnification| = |-7.5| = 7.5. Therefore, the angular magnification of the telescope is 7.5.

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The COP of the heat pump is 2. The coefficient of performance (COP) is a measure of the efficiency of a heat pump, defined as the ratio of the desired output of heat to the input of work.

In this case, the desired output of heat is 10 kW and the input of work is 5 kW, so the COP of the heat pump is: COP = desired output / input of work COP = 10 kW / 5 kW COP = 2

which means that for every unit of work input, the heat pump produces two units of desired output heat. This is a measure of the efficiency of the heat pump, with higher COP values indicating better efficiency.

Heat pumps are a popular and efficient way to heat homes, as they can extract heat from the outside air or ground, and use it to heat the indoor air. The COP of a heat pump can vary depending on factors such as the temperature difference between the inside and outside, and the efficiency of the components used in the system.

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Suppose a 200-mm focal length telephoto lens is being used to photograph mountains 9.5 km away, The image distance for this lens is approximately 0.200 m (200 mm).

To calculate the image distance for a 200-mm focal length telephoto lens photographing mountains 9.5 km away, we can use the lens formula:
1/f = 1/do + 1/di
where f is the focal length (200 mm), do is the object distance (9.5 km), and di is the image distance we want to find.
Step 1: Convert distances to the same units (meters).
Focal length: 200 mm = 0.2 m
Object distance: 9.5 km = 9500 m
Step 2: Plug the values into the lens formula.
1/0.2 = 1/9500 + 1/di
Step 3: Rearrange the formula to solve for di.
1/di = 1/0.2 - 1/9500
Step 4: Calculate the value of 1/di.
1/di = 5 - 0.00010526
1/di = 4.99989474
Step 5: Find the value of di by taking the reciprocal of the previous result.
di = 1/4.99989474
di ≈ 0.200021 m

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Answer:

cool air flows toward the ground

Explanation:

Answer:

it brings heat

Explanation:

or it can lead you to death when warm air rises

The angular velocity of the wheel is 50 rad/s. The centripetal acceleration of the wheel is 1000 m/s^2.

The angular velocity of a wheel is given by the formula:

ω = v / r

where ω is the angular velocity, v is the linear velocity, and r is the radius of the wheel.

Substituting the given values, we have:

ω = 20 m/s / 0.4 m = 50 rad/s

Therefore, the angular velocity of the wheel is 50 rad/s.

To find the number of rotations the wheel makes in 5 seconds, we can use the formula:

θ = ω * t

where θ is the angular displacement, ω is the angular velocity, and t is the time. Since the wheel rotates 2π radians in one full revolution, we can find the number of rotations by dividing the angular displacement by 2π. Substituting the given values, we have:

θ = 50 rad/s * 5 s

= 250 rad

Number of rotations = θ / 2π

= 250 rad / 2π rad/rev ≈ 39.79 rev

Therefore, the wheel will rotate approximately 39.79 times in 5 seconds.

To find the centripetal acceleration of the wheel, we can use the formula:

a = v^2 / r

where a is the centripetal acceleration, v is the linear velocity, and r is the radius of the wheel. Substituting the given values, we have:

a = (20 m/s)^2 / 0.4 m

= 1000 m/s^2

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A resistor is connected to a 3.0 V battery and the power dissipated in the resistor is 1.0 W. If the battery is now traded for a 6.0 V battery, the power dissipated by the resistor is now 4.0 W.

The power dissipated by a resistor is given by the formula:

P = V²/R

Rearranging this formula we get:

R = V²/P

Power is directly proportional to the square of voltage.

Hence, if the voltage is doubled, the power will be quadrupled.

Therefore, the power dissipated by the resistor will be four times the original power when the battery is traded for a 6.0 V battery.

Thus, the power dissipated by the resistor is 4.0 W now.

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