A room was lighted with three 100-watt bulbs for 5 hours per day. If the cost of
electricity was 9¢ per kWh, how much would be saved per day by switching to
60-watt bulbs?

Answer:

not sure

Explanation:

jahhhhhsjjjjdddddhdhdj hbdbd#dialectical DHL I have no clue W Bush administration and I don't have any jshshhhhdgggddddddd the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

jsbsbd the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

the entire community was literate because

a. they had been slaves and had not been to school

b. they were too poor to go to school

c. work was more important to them than education

d. they avoided to going school

BFF and I don't have any questions please call her and her husband to the hospital for a bit more time with my family grew up in the form of a ring whose inner circumference is it a lot of people who are you doing today beautiful and I don't have any questions please call her and her husband to the

At 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

The temperature over a 24-hour period can be modeled using a sinusoidal function, given that the high temperature of 77°F occurs at 6 PM and the average temperature is 59°F.

To find the temperature at 7 AM, we need to consider the characteristics of a sinusoidal function. In this case, the function represents a single day, with the peak temperature at 6 PM and the average temperature over the 24-hour period.

Since a sinusoidal function repeats itself every 24 hours, we can infer that the low temperature would occur 12 hours after the high temperature. Therefore, at 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

To gain a deeper understanding of sinusoidal functions and their applications in modeling temperature variations over time, it would be beneficial to explore topics such as periodic functions, trigonometry, and mathematical modeling.

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do your work own bro its your question

If the strong force was suddenly turned off throughout the universe, atoms would almost immediately disintegrate as the strong force is responsible for holding the nucleus of an atom together.

This would result in a release of energy as the protons and neutrons in the nucleus repel each other due to the electromagnetic force. The energy released would be so great that it would cause a massive explosion, similar to a nuclear explosion. Furthermore, the absence of the strong force would also affect the stability of neutron stars and supernovae, which rely on the strong force to maintain their structure. Overall, the absence of the strong force would result in a catastrophic and potentially apocalyptic scenario for the universe.

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If the diverging lens is 39 cm from the converging lens, then the final image will be to the left of the diverging lens.

To solve this problem, we need to first find the location of the intermediate image formed by the converging lens. We can use the lens formula:

1/f = 1/do + 1/di

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

For the converging lens:
f = 19 cm, do = 36 cm

1/19 = 1/36 + 1/di

Solving for di, we get di = 28.44 cm (rounded to 2 decimal places)

Now, let's consider the new distance between the lenses: 39 cm. The object distance for the diverging lens becomes:

do = 28.44 cm + 39 cm = 67.44 cm

For the diverging lens:
f = -11 cm, do = 67.44 cm

1/-11 = 1/67.44 + 1/di

Solving for di, we get di = -15.09 cm (rounded to 2 decimal places)

Since the image distance is negative, the final image is formed to the left of the diverging lens.

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The displacement of ramp is 3.288 m and the ramp makes an angle of Ф = 8.7° with the horizontal.

Displacement [x] of an object is the length of the straight line joining the initial and final position of the object. Mathematically, if the velocity of the body is [v] m/s at an instant of time, then displacement can be written as-

v = dx /dt

dx = vdt

∫dx = ∫vdt

x = vt

Given is an inclined ramp that has a height of 0.50 m and a horizontal distance (run) of 3.25 m.

We can find the displacement of ramp using the Pythagoras theorem. The base will be equal to horizontal distance and height will be equal to vertical distance. The length of the hypotenuse will be equal to that of displacement. Therefore -

[h]² = [b]² + [p]²

[h]² = (0.5)² + (3.25)²

[h]² = 10.8125

[h] = √10.8125

[h] = 3.288 m

Direction can be calculated using the tangent function as follows.

tan Ф = [p]/[b]

tan Ф = (0.5)/(3.25)

Ф = tan⁻¹ (0.5)/(3.25)

Ф = 8.7°

Therefore, the displacement of ramp is 3.288 m and the ramp makes an angle of Ф = 8.7° with the horizontal.

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The electric potential of a point charge is given by:

where q is the charge and r is the distance between the charge and the point of interest. In this case we have two charges, then to calculate the total potential on a point we need to add the individual potential of each charge.

For both charges the point of interest is at 0.1097 m, then we have:

Therefore, the electric potential midway of the charges is:

Answer:

60Nm

Explanation:

Given data

Applied force= 200N

length of spanner= 30cm to meter

= 30/100= 0.3m

We know that the formula for the moment is

P=Fl

that is

P= force * length

P= 200*0.3

P= 60Nm

Hence the moment is 60Nm

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Yes. The paint can take in energy from the light, causing it to be damaged.

the answer is

A , Yes. The paint can take in energy from the light, causing it to be damaged

Answer:13,3 m/s

Explanation:We can use the Torricelli equation:

v^2=v0^2+2ah

the initial velocity is 0

v0^2=0

so:

v^2=0+2*9,8*9

v^2=176,4

v=13,3 (approx)

Answer:

For me i think the answer will be 13.72m/s

The overall net percentage of gain in the three stocks purchased each with $ 100 in which stock a increased 30% in value. stock b increased 15% in value. stock c lost 20% of its original value is 8.3 %

Value of Stock a = 100 + 30%

Value of Stock a = $ 130

Value of stock b = 100 + 15%

Value of stock b = $ 115

Value of stock c = 100 - 20%

Value of stock c = $ 80

Net percentage gain = ( Net profit / Total investment - 1 ) * 100

Net profit = 130 + 115 + 80

Net profit = $ 325

Total investment = 100 + 100 + 100

Total investment = $ 300

Net percentage gain = ( 325 / 300 - 1 ) * 100

Net percentage gain = ( 0.083 ) * 100

Net percentage gain = 8.3 %

Therefore, the the overall net percentage of gain in the three stocks is 8.3 %

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When the package hits the ground, the plane will be 4,687.2 m away.

The time taken for the package to fall from the given height is known as the time of motion of the package and the magnitude is calculated by applying the following kinematic equation.

h = vt + ¹/₂gt²

where;

h = 0 +  ¹/₂gt²

t = √(2h/g)

t = √ [ (2 x 1390) / ( 9.8) ]

t = 16.8 seconds

The horizontal displacement of the plane at this time;

X = ut

where;

X = 279 x 16.8

X = 4,687.2 m

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a) initial velocity mdv/dt =  -2i + 4t^2j,2*dv/dt =  -2i + 4t^2j,dv/dt = -1i + 2t^2j,intdv/dt (from 8.5i to v) = -0.5*t^2i + (2*t^3 / 3)j,v - 8.5i = -0.5*t^2i + (2*t^3 / 3)j,at t = 2 sec,v = 6.5i + 16.3j,IvI = sqrt(6.5^2 + 5.3^2),IvI = 8.4 m/s. b)at this point x = 0,t^2/2 = 8.5,t^2 = 8.5 x 2,t = 4.12 sec.

Thus, when the I element of velocity v = 0, the projectile will accuracy and faster to the Y axis.The missile will therefore tp - link to a Y axis after 3 seconds.

The velocity of a projectile at any time can be expressed in vector form as v (t) = v x I + v y j, where is the velocity vector's component at that instant and is its component.

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The natural age-related loss of bone mass is called "osteoporosis."

Hence, the correct option is B.

Osteoporosis is a condition characterized by a gradual loss of bone density and deterioration of bone tissue, leading to increased fragility and susceptibility to fractures. It is often referred to as the "silent disease" because it progresses without noticeable symptoms until a fracture occurs.

As people age, it is natural for bone mass to decrease gradually. However, in individuals with osteoporosis, this loss of bone mass is accelerated, making their bones weaker and more prone to fractures. Osteoporosis commonly affects older adults, particularly women after menopause, but it can also occur in men.

Several factors contribute to the development of osteoporosis, including hormonal changes, inadequate calcium and vitamin D intake, sedentary lifestyle, smoking, excessive alcohol consumption, certain medications, and certain medical conditions. Genetics also play a role, as a family history of osteoporosis increases the risk.

Hence, the correct option is B.

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Answer:

friction. or gravity both ofbthem .....................

..

Considering the heat of vaporization of benzene, the mass that will evaporate, at the boiling point, if 8.44 kJ/g of heat is extracted is 21.36 g.

Given the heat of vaporization of benzene, 395 J/g and the heat removed, 8.44 kJ, we can determine the mass of benzene that condenses by converting the heat removed to J/g as follows:

Qv = 8.44 kJ/g · 1000 J / 1 kJ = 8440 J/g

Hence, mass of benzene that condenses can be found by dividing the heat removed by the heat of vaporization as shown:

mass = heat removed / heat of vaporization

m = 8440 J/g / 395 J/g

m = 21.36 g

Therefore, 21.39 g of benzene will condense at its boiling point if 8.44 kJ is removed.

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Answer:

Organelles

Explanation:

I learned this in science.

When we do, we make sure to measure our mass in kilograms. We determine that F is equal to 124.26 newtons by entering these numbers into our calculator.

That is the average magnitude of the force applied to the tennis ball.

The equation that Newton was referring to is shown by a serve. You can calculate the total force that was applied by the tennis racket to the ball by multiplying the weight of the racket by the speed at which the player swings their racquet.

An average 120-mph serve slows to 82 mph before the bounce, 65 mph after the bounce, and 55 mph at the opponent's racket, according to tennis instructor and analyst John Yandell.

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Answer:

speed

Explanation:

Change in velocity, not velocity, is used to calculate the average acceleration. Velocity is displacement over time.

It is defined as the ratio of change in velocity to time. It is given by:

Acceleration= Change in velocity / time

a= u-v / t

where,

u= initial velocity

v= final velocity

t= time

Thus, we can conclude that a change in velocity is used to calculate average acceleration.

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Plot a graph, constant speed of movements represented as straight lines. Time on X axis (seconds)  and position on Y axis (metres) , calculated by moving, e.g 4metres in a second.

The efficiency of the ramp can be improved by smoothening the surface. The correct option is D.) Smooth the surface

Efficiency is the percent of work put into a machine by the user that becomes work done by the machine.

It could also be defined as the percentage ratio of the output energy to the input energy.

The closer to 100 percent a machine’s efficiency is, the better it is at reducing friction.

Therefore, a surface that would provide a lower friction would increase the efficiency of the ramp.

A smooth surface reduces friction.

Hence, the efficiency of the ramp can be improved by smoothening the surface. The correct option is D.) Smooth the surface

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Answer:

sorry

Explanation:

Answer:

The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.

Answer:

Zero

Explanation:

The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.

The amount of energy required to produce 4.75 moles of gaseous water is 198.5 kJ.

The energy required to produce gaseous water from liquid water is given as 44.0 kJ/mol. This means that for every mole of liquid water that is converted to gaseous water, 44.0 kJ of energy must be added to the system.

To find the total energy required to produce 4.75 moles of gaseous water, we simply multiply the energy per mole by the number of moles:

Energy = 44.0 kJ/mol * 4.75 moles = 208.5 kJ

So, 208.5 kJ of energy must be added to the system to produce 4.75 moles of gaseous water from liquid water.

This energy is used to break the hydrogen bonds between the water molecules in the liquid and to increase the kinetic energy of the water molecules so that they have enough energy to escape from the liquid into the gas phase.

The energy required to produce gaseous water from liquid water is an example of an endothermic process, which means that energy must be added to the system for the process to occur.

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A. the change in volume of the cube is approximately 0.120601 cm^3. B. the average rate of change of volume of the cube with respect to an edge length is approximately 12.0601 cm^3/cm. C. the equation of the line that passes through the point (1, 5) and is parallel to the tangent line to f(x) = 1/x at x = 3 is y = (-1/9)x + 14/9.

(a) To find the change in volume of the cube as x increases from 2.00 to 2.01 centimeters, we need to calculate the difference in volume between these two values.

The volume of a cube is given by V = x^3, where x is the edge length.

For x = 2.00 cm, the volume V1 = (2.00 cm)^3 = 8.00 cm^3.

For x = 2.01 cm, the volume V2 = (2.01 cm)^3 = 8.120601 cm^3.

The change in volume is ΔV = V2 - V1 = 8.120601 cm^3 - 8.00 cm^3 ≈ 0.120601 cm^3.

Therefore, the change in volume of the cube is approximately 0.120601 cm^3.

(b) The average rate of change of volume of the cube with respect to an edge length as x increases from 2.00 to 2.01 centimeters can be calculated by dividing the change in volume by the change in edge length.

ΔV = 0.120601 cm^3 (from part a)

Δx = 2.01 cm - 2.00 cm = 0.01 cm

The average rate of change of volume is ΔV/Δx = 0.120601 cm^3 / 0.01 cm ≈ 12.0601 cm^3/cm.

Therefore, the average rate of change of volume of the cube with respect to an edge length is approximately 12.0601 cm^3/cm.

(c) The instantaneous rate of change of volume of the cube with respect to an edge length at the instant when x = 2 centimeters can be found by taking the derivative of the volume function V = x^3 with respect to x and evaluating it at x = 2.

dV/dx = 3x^2

At x = 2 cm, the instantaneous rate of change of volume is dV/dx evaluated at x = 2:

dV/dx = 3(2 cm)^2 = 12 cm^2.

Therefore, the instantaneous rate of change of volume of the cube with respect to an edge length at x = 2 centimeters is 12 cm^2.

To find the equation of the line that passes through the point (1, 5) and is parallel to the tangent line to f(x) = 1/x at x = 3, we need to determine the slope of the tangent line.

The derivative of f(x) = 1/x is given by f'(x) = -1/x^2.

At x = 3, the slope of the tangent line is f'(3) = -1/(3^2) = -1/9.

Since the line we want to find is parallel to the tangent line, it will have the same slope. So the slope of the line is -1/9.

Using the point-slope form of a linear equation, we can write the equation of the line as:

y - y1 = m(x - x1),

where (x1, y1) is the given point (1, 5) and m is the slope.

Substituting the values, we have:

y - 5 = (-1/9)(x - 1).

Expanding and rearranging the equation, we get:

y = (-1/9)x + 14/9.

Therefore, the equation of the line that passes through the point (1, 5) and is parallel to the tangent line to f(x) = 1/x at x = 3 is y = (-1/9)x + 14/9.

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The virtual image created by the rear-view mirror of the truck is upright and appears 0.67 times smaller than the actual size of the truck. It is located at a distance of 3.33m from the mirror.

To calculate the size and position of the image formed by the rear-view mirror, we can use the mirror formula and magnification formula.

The mirror formula is given by:

1/f = 1/v + 1/u

Where:

f = focal length of the mirror

Let v represent the image distance, which is the distance between the mirror and the location where the image is formed.

In this scenario, the rear-view mirror functions as a convex mirror with a radius of curvature (R) of 4m. The focal length (f) of a convex mirror is half the radius of curvature, which in this case is 2m.

The distance from the object to the mirror is referred to as the object distance (u), and it is specified as 5m. Our goal is to determine the image distance (v).

Using the mirror formula:

1/2 = 1/v + 1/5

Rearranging the equation:

By applying the formula

1/v = 1/2 - 1/5,

we can simplify it to

5/10 - 2/10,  which results in 3/10.

Taking the reciprocal:

v = 10/3 = 3.33m

Using the magnification formula, we can determine the relative size of the image compared to the size of the truck.

Magnification (m) = -v/u

Where:

m = magnification

v = image distance

u = object distance

Plugging in the values:

m = -(3.33/5) = -0.67

The negative sign indicates that the image formed by the convex mirror is virtual and upright, which signifies that it appears smaller than the actual object. Consequently, the size of the image is 0.67 times smaller compared to the size of the truck.

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The current required in the windings for that to occur is  \(I = 3.18 *10^{6} A\).

The magnetic field of a solenoid is calculated using the formula:

B= µo*I* Equation 1

Where:

B: magnetic field in Teslas (T)

µo: free space permeability in T*m/A

I = Intensity of the current flowing through the conductor in ampere (A)

N = number of turns

L= solenoid length in meters (m)

Data of the problem:

L=0.4m,   B= 10000T,  N=1000 turns, µo=

We cleared I of equation (1):

I=L*B/ µo*N

\(I = \frac{0.4*10000}{4\pi *10^{-7}*1000 }\)

\(I = \frac{4}{4\pi *10^{-7} }\)

\(I = \frac{10^{7} }{\pi }\)

\(I = 0.318*10^{7}\)

\(I = 3.18*10^{6} A\)

The magnetic field of a solenoid is proportional to both the applied current and the number of turns per unit length. It is independent of the diameter of the solenoid and the electric field strength is independent of position within the solenoid. H. The fields inside are constant. Inside the solenoid, the magnetic field lines are straight and the magnetic field is strong. Outside the electromagnet, the magnetic field is weak and the lines of force form a closed loop. Therefore, the magnetic field inside the solenoid is uniform.

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Stars, including the Sun, undergo a process called nuclear fusion in their core, where hydrogen nuclei combine to form helium.

This fusion reaction releases a tremendous amount of energy, which is the source of the Sun's light and heat. As the fusion occurs, the denser helium nuclei (alpha particles) that are produced tend to sink towards the inner part of the star's core. This is due to their higher mass compared to hydrogen nuclei. The sinking of the helium is a result of gravitational settling, where the heavier elements separate from the lighter ones under the influence of gravity.

The sinking of helium creates a density gradient within the star, with the heavier helium concentrated in the inner region. This process is part of the overall structure and dynamics of a star, as it influences the energy transport mechanisms and the overall evolution of the star over its lifetime.

It's important to note that while the helium sinks to the inner part of the star's core, the overall structure of a star is complex and involves various layers and processes. The specific details can vary depending on the mass and stage of the star.

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The complete question is:

The maximum possible efficiency of an automobile engine with an exhaust temperature of 120°C and a burning gas temperature of 620°C is 0.46, which corresponds to Option D.

The efficiency of an engine is determined by the Carnot efficiency formula, which is based on the temperatures of the hot reservoir (temperature of the burning gas) and the cold reservoir (exhaust temperature). The maximum efficiency is achieved when the engine operates as a Carnot engine.

Using the Carnot efficiency formula:

Efficiency = 1 - (Tc / Th)

Where Tc is the temperature of the cold reservoir (exhaust temperature) and Th is the temperature of the hot reservoir (burning gas temperature).

Plugging in the given values:

Efficiency = 1 - (120°C / 620°C) = 1 - 0.1935 ≈ 0.8065 ≈ 0.46 (rounded to two decimal places)

Therefore, the correct answer is Option D, 0.46, representing the maximum possible efficiency of the automobile engine.

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