To compare the brightness of light bulbs, you should look for the luminous flux in lumens on their labels, as this measures the perceived power of light by the human eye, offering a more accurate representation of brightness than wattage alone.
Explanation:To compare the brightness of light bulbs for sale in a store, you should look on the labels to see how they are rated in terms of luminous flux, which is measured in lumens (lm). The luminous flux is a measure of the perceived power of light by the human eye. Energy-saving light bulbs like compact fluorescent lamps and LED bulbs provide more luminous flux for a given use of electricity, meaning they have higher luminous efficacy, represented in lumens per watt. When replacing an old incandescent bulb with an energy-saving one, it is important to compare lumens to ensure the same level of brightness is achieved.
Traditionally, people have been accustomed to associating the brightness of a bulb with its power consumption in watts due to the prevalence of incandescent bulbs. However, as technology has advanced, the importance of comparing lumens, rather than just wattage, has become clear for a more accurate representation of a bulb's light intensity. A higher wattage does not necessarily mean more visible light, since not all electrical power is converted into visible light. Also, different types of bulbs convert electricity to light with varying efficiencies.
Note: The efficiency of a light bulb, which is the fraction of its total light output that falls within the visible range, is never 100% due to the nature of thermal sources and the distribution of emitted wavelengths.
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PNEWTON
What is the ist law of motion?
Answer:
Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.
Explanation:
mark brainliest answer please
without fluid friction, all objects accelerate at?
Answer:
Acceleration of gravity=[tex]9.8m/s/s[/tex]
Explanation:
Newton's Second Law-acceleration is proportional to the net force acting on an object.
All objects usually free fall at the same acceleration of [tex]9.8m/s/s[/tex]-this regardless of their mass. This acceleration is known as acceleration of gravity.
Which phase of matter consists of particles that vibrate only?
Answer: Solids
Explanation: Solids have very little movement and the particles have barely enough movement to vibrate. We can't see it but the particles are indeed vibrating. Solids have the least amount of kinetic energy which is moving energy.
When you're asked to calculate moments and torque, what's the main difference in calculation? Also what is a couple?
Answer:
a) Explanation below. b) Explanation below
Explanation:
Torque is defined as the product of a force by a radius, while momentum is defined as the product of force by a distance. Mathematically we would have
T = F * r
M = F * d
where:
T = torque = [N*m]
M = moment = [N*m]
F = force =[N]
d = distance [m]
r = radius [m]
Although they have the same units, the difference between them is the application. For the case of torque this is always applied in parts that are in rotation, such as the shafts of cars, the shafts of pumps, torque in gears and etc. While the moment can be applied to a body without the need for it to rotate.
A couple, is as its name suggests a couple of forces of equal magnitude but opposite sense and do not share a line of action. A body under the action of a couple of forces tends to rotate the body without moving it from one point to another.
A man pushes a cart with force of 120-N at an angle of 50 degrees with the ground. If he walks a horizontal displacement of 20-m going to cashier who’s much work is done!
Answer:
1543 J
Explanation:
The work done by a force when moving an object is given by the equation:
[tex]W=Fd cos \theta[/tex]
where:
F is the magnitude of the force applied on the object
d is the displacement of the object
[tex]\theta[/tex] is the angle between the direction of the force and of the displacement
For the cart pushed in this problem, we have:
[tex]F=120 N[/tex] is the force applied by the man
[tex]d=20 m[/tex] is the displacement of the cart
[tex]\theta=50^{\circ}[/tex] is the angle between the directions of the force and of the displacement
Solving for W, we find the work:
[tex]W=(120)(20)(cos 50^{\circ})=1543 J[/tex]
Which of these is not a part of the
cardiovascular system?
Answer:I don't see any
Explanation:
Answer: (B) The pancreas is a part of the cardiovascular system. The heart and your circulatory system is a part of it (which includes blood and your veins/arteries).
Explanation:
without fluid friction, all objects accelerate at?
Answer:
Without fluid friction, all objects accelerate at the gravity acceleration.Explanation:
When an object moves through a fluid, like air, water or oil, the object experiences a resistance to flow; this is, to pass through the fluid.
This resistance force is the fluid friction.
In few words, fluid friction is a force that opposes the motion of the objects through the fluid.
Then, in the abscence of fluid friction, all objects falling accelerate at the gravity acceleration.
A missile is moving 1350 m/s at a 25.0 degree angle. It needs to hit a target 23500 m away in a 55.0 degree direction in 10.20s. What is the direction of its final velocity?
Answer:
V=[tex]3204m/s[/tex]
Direction is normal to the incline
Explanation:
This question tests on projectile motion.
First, calculate the acceleration of the missile.
Incline=55º,Distance=23500m, t=10seconds.
Horizontal motion of projectile
[tex]x=V_xt+0.5a_xt\\23000Cos55\textdegree=1350Cos25\textdegree\times10.20+0.5a_x(10.20)^2\\a_x=19.2m/s^2[/tex]
Final velocity
[tex](V_x)\prime=V_x+a_xt=1350Cos25\textdegree+19.2\times10.20=1419m/s[/tex]
The vertical motion of the missile can be calculated as:
[tex]23500 Sin55.0\textdegree =1350Sin25\textdegree\times10.2+0.5a_y\times10.2^2\\a_y=258.2m/s^2[/tex]
Final Velocity is:
[tex](V_y)\prime=V_y+a_yt=1350Sin25\textdegree+258.2\times10.20=3204m/s[/tex]
Combining both we get
[tex]V=\sqrt(V\prime x^2+V\primey^2)=3504.2m/s[/tex]
*Misile's motion is normal to the 55º incline.
please help!!!!!!! (attached to the file)
Answer:
B
Explanation:
the battery isn't chemical energy so any answer saying that you can cross out and that leaves you with B
Every object with mass exerts a gravitational force on every other object with mass. The gravitational force between which of the
following two objects would be easiest to detect with measuring equipment?
A.
an electron and a bowling ball
OB. the Moon and the Earth
C.
a baseball and a bowling ball
D.
a human and a dog
The body weighing 2 kg moves through the horizontal surface and crosses the path x = 75 cm The coefficient of friction of the body and horizontal surface is 0.8. If the kinetic energy of the body in the starting position is 16J, how much will the kinetic energy of the body be in the definitive position?
The kinetic energy of the body in definitive position is 4.24 J.
Explanation:
As per the work energy theorem, the work done on any system or object to move it from one position to another is equal to the change in kinetic energy of the object. In this case, the body weighing 2 kg is moved over an horizontal surface for a distance of 75 cm. As there will be frictional force acting on the body while moving over the surface. This frictional force multiplied by the distance the object is moved will give the work done on the body.
Frictional force = Coeffficent of friction × Normal force.
As the weight of the body is 2 kg, the normal force acting on it will be mass multiplied with acceleration due to gravity.
Frictional force = - 0.8×9.8 × 2 =-15.68 N
So the work done will be the product of frictional force with the displacement of 75 cm or 0.75 m.
Work done = Frictional force × Displacement
Work done = -15.68×0.75 = -11.76 J.
So the work is done by the object.
If the kinetic energy of the body at starting is 16 J, then the kinetic energy of the body at definitive position will be obtained as below.
Work done = change in kinetic energy
-11.76 J = Final kinetic energy-16 J
Final Kinetic energy = - 11.76+16
Final kinetic energy = 4.24 J
Thus, the kinetic energy of the body in definitive position is 4.24 J.
What is the charge on an object that has 1.09x10^13 excess electrons?
Answer:
[tex]-1.74\cdot 10^{-6} C[/tex]
Explanation:
The electron is the particle that rotates around the nucleus of the atom; it has a negative electric charge equal to :
[tex]e=-1.6\cdot 10^{-19}C[/tex]
which is known as fundamental charge.
For an object containing N excess electrons, the total charge of the object is
[tex]Q=Ne[/tex]
In this problem, the number of excess electrons in the object is:
[tex]N=1.09\cdot 10^{13}[/tex]
Therefore, by plugging it the numbers, we can find the value of Q, the total charge of the object:
[tex]Q=(1.09\cdot 10^{13})(-1.6\cdot 10^{-19})=-1.74\cdot 10^{-6} C[/tex]
An Inter City Express train traveling at 250 km/h is
braked to a stop in a distance of 4820 m. If the mass of the
train is 8.63 X 105 kg, what is the average braking force?
Answer:
F = 431671.31 [N]
Explanation:
This problem can be solved using the work and energy theorem, which tells us that the initial mechanical energy (potential energy + kinetic energy) plus the sum of the work from the initial position to the end will be equal to the final mechanical energy.
[tex]E_{M1}+W_{1-2}=E_{M2}\\0.5*m*v_{1}^{2}+W_{1-2}=0.5*m*v_{2}^{2}[/tex]
As the train stops at the end, the speed at Point 2 is equal to zero,so we can determine the work, we first convert the speed from [km/h] to meters per second.
[tex]250[\frac{km}{h}]*1[\frac{h}{3600s} ]*1000[\frac{m}{1km} ]\\= 69.44[\frac{m}{s} ][/tex]
[tex]0.5*(8.63*10^{5})*(69.44)^{2}+W_{1-2}= 0.5*(8.63*10^{5})*(0)^{2}\\W_{1-2}=-2080.66*10^6[J][/tex]
The negative sign means that the work is done in the opposite direction to the movement.
Knowing the work we can calculate the force, since an initial input data is the distance
W = F * d
F = W / d
F = (2080.66*10^6) / 4820
F = 431671.31 [N]
Check
Use the drop-down menus to choose the planets being described.
This planet had the Great Dark Spot.
This planet has the most visible rings.
This planet rotates from top to bottom.
This planet has the Great Red Spot.
Answer:
the first one is: Neptune
second one: Saturn
third one: Uranus
fourth one: Jupiter
Explanation:
The classification is as follows:
This planet had the Great Dark Spot - Neptune .This planet has the most visible rings - Saturn.This planet rotates from top to bottom - Uranus. This planet has the Great Red Spot - Jupiter.Learn more: https://brainly.com/question/537797?referrer=searchResults
A right triangle with base labeled Vector J = 6, the height labeled Vector K = unknown and the hypotenuse labeled Vector L = 10 meters. What is the magnitude of vector K
Answer:
K = 8
Explanation:
The magnitude of k can be found using Pythagoras theorem.
Given hypotenuse L = 10
J = 6
K = ?
L^2 = J^2 + k^2
Therefore
10^2 = 6^2 + k^2
10 x 10 = 6 x 6 c k^2
100 = 36 + k^2
Subtract 36 from both sides
100 - 36 = 36 - 36 + k^2
64 = k^2
K^2 = 64
K = squared root of 64
K = 8
When it is cloudy, many of the sun’s rays never reach the Earth. What does this do to the temperature
Answer:
When it is cloudy, many of the sun’s rays never reach the Earth. It leads to cooler temperatures.
Explanation:
During the day, the sun warms the earth. When the sky is clear, more heat reaches the earth's surface . This leads to warmer temperatures.
However, when the sky is cloudy, a few drops of clouds reflect some of the sun's rays. As a result, less solar energy can reach Earth's surface, causing Earth to heat up more slowly. This leads to cooler temperatures.
If cloudy skies are forecast when forecasting daytime temperatures, expect lower temperatures than you would expect if clear skies were forecast.
Similarly, cloud cover at night has the opposite effect. When the sky is clear, the heat emitted from the earth's surface freely escapes into space, resulting in cooler temperatures.
However, when there are clouds, some of the heat from the earth's surface is captured by the clouds and returned to the earth. As a result, temperatures drop more slowly than when the sky is clear.
Final answer:
Cloud cover influences Earth's temperatures, with thick clouds leading to cooler days by blocking sunlight and warmer nights by trapping heat. Low clouds primarily cool the Earth while high clouds can contribute to warming due to trapping of infrared radiation. This results in different temperature outcomes depending on cloud type and time of day.
Explanation:
When it is cloudy, many of the sun’s rays are either reflected or absorbed by clouds, which can significantly influence temperature conditions on Earth. During the day, thick clouds can prevent the sun's energy from warming the Earth's surface as effectively, leading to cooler daytime temperatures. Conversely, at night, these same clouds can act as an insulating layer, trapping longwave radiation that is emitted from the Earth's surface and preventing it from escaping into space, resulting in warmer nighttime temperatures.
Furthermore, cloud cover affects the radiation balance of Earth differently based on the type of clouds. Low clouds generally have a net cooling effect since they reflect more sunlight back into space. On the other hand, high cirrus clouds tend to have a net warming effect by trapping more infrared radiation. This dynamic leads to a complicated system of cloud feedbacks that influence global temperature patterns.
In summary, clouds play a critical role in the Earth's climate system by influencing how much of the sun's energy is absorbed or reflected, and how much earthly heat is retained or released, thereby affecting the overall temperature experienced at Earth's surface.
the speed of the sound wave in the chosen m_____ should be known
Answer:
meters or meter...
Explanation:
....
What is the wavelength of a radio wave with a frequency of 2.00 x 10^4 Hz? (hint: what is the speed of all electromagnetic radiation?)
ОА
6.67 x 105 m
O
B
1.50 x 104 m
6.00 x 1012 m
6.67 x 10m
Answer: Option B
The wavelength for a radio wave with a frequency of 2 × 10⁴ Hz is
1.5 × 10⁴ m.
Explanation:
Wavelength is the measure of distance between two successive crests or troughs in a standing wave. Also wavelength can be measured as the ratio of velocity of light to frequency. It is like this because wavelength is inversely proportional to the frequency.
[tex]Wavelength =\frac{c}{frequency}[/tex]
As c = 3 × 10⁸ m/s and the frequency is 2 × 10⁴ Hz, then the wavelength will be
[tex]Wavelength =\frac{3*10^{8} }{2*10^{4} } =1.5*10^{4} m[/tex]
So, the wavelength for a radio wave with a frequency of 2 × 10⁴ Hz is
1.5 × 10⁴ m.
2. A 4-kg gun shoots a 0.1-kg bullet at 400 m/s. Find the recoil speed of the gun.
Answer:10m/s
Explanation:
M=mass of gun=4kg
U=recoil velocity of gun
m=mass of bullet=0.1kg
V=velocity of bullet=400m/s
M x U=m x V
4 x U=0.1 x 400
4xU=40
Divide both sides by 4
(4xU)/4=40/4
U=10m/s
Recoil velocity=10m/s
2 resistors of resistance 1000 ohm and 2000 ohm are joined in series with a 100V supply. A voltmeter of internal resistance 4000 ohm is connected to measure the potential difference across 1000 ohm resistor. Calculate the reading shown by the voltmeter.
The potential difference across a resistor measured using a voltmeter takes into account the internal resistance of the voltmeter, altering the circuit dynamics. Calculations involve finding the equivalent resistance of the voltmeter-resistor parallel combination and applying Ohm's law accordingly.
Explanation:When measuring the potential difference across a resistor in a series circuit using a voltmeter, it is essential to consider the internal resistance of the voltmeter itself, as it is placed in parallel with the resistor being measured. In this case, with resistors of 1000 ohm and 2000 ohm connected in series to a 100V supply and a voltmeter of 4000 ohm internal resistance connected across the 1000 ohm resistor, the circuit's behavior is modified. First, calculate the total series resistance, which is 3000 ohms. This gives a total current (I) of 100V/3000 ohms = 0.0333 A. The voltage across the 1000 ohm resistor without the voltmeter would be V = IR = 0.0333A × 1000 ohm = 33.3V.
However, the presence of the voltmeter alters this calculation by creating a parallel circuit with the 1000 ohm resistor and the voltmeter's 4000 ohm resistance. The equivalent resistance of this parallel circuit can be calculated with 1/Req = 1/R1 + 1/R2, leading to an equivalent resistance of 800 ohms. Applying Ohm's law again for the modified circuit gives a slightly different current, and subsequently, the potential difference can be calculated.
Possible reasons why seascorpions went extinct
How do electrons and protons differ in their electric charge?
Answer:opposite sign, but same magnitude
Explanation:
what is quantum programing
Answer: Quantum programming is the process of assembling sequences of instructions, called quantum programs, that are capable of running on a quantum computer. Quantum programming languages help express quantum algorithms using high-level constructs.
Explanation:
Final answer:
Quantum programming involves creating algorithms and software for quantum computers, utilizing qubits and principles like superposition and entanglement. It requires knowledge of quantum mechanics and is supported by programming languages like Q# and Qiskit.
Explanation:
Quantum Programming
Quantum programming is a field within computer science that focuses on the development of algorithms and software for quantum computers. These computers leverage the principles of quantum mechanics to process information in ways that traditional computers cannot. Quantum programming often involves the use of quantum bits or qubits, which, unlike classical bits, can exist in multiple states simultaneously. This state is known as superposition, and it allows quantum computers to perform certain computations much faster than classical computers. Another key concept in quantum computing is entanglement, which enables qubits that are entangled to be correlated with one another even when separated by large distances.
Quantum programming languages, such as Q# by Microsoft and Qiskit by IBM, provide frameworks for developers to write programs that can run on quantum computers. The field is highly interdisciplinary, drawing from areas such as physics, mathematics, and computer science.
If 600 J of work is done in 38, what is the power?
If 600 J of work is done in 38 hours, the power is 0.00439 watt.
What is the kinetic energy of a 7.26kg bowling ball Thai is rolling at a speed of 2m/s
Answer:14.52joules
Explanation:
Mass(m)=7.26kg
Velocity(v)=2m/s
Kinetic energy=(mv^2)/2
Kinetic energy=(7.26x2^2)/2
Kinetic energy =(7.26x4)/2
Kinetic energy =29.04/2
Kinetic energy =14.52joules
what is the order of magnitude of the speed of light
Answer:
The order of magnitude of speed of light in S.i. units is 8. Therefore c=3×10^8 meter / second.
Explanation:
A balloon has a volume of 18.0-L at a pressure of 87.6 kPa. What will be the new volume when the pressure is 48.2 kPa?
Answer:
32.71 L
Explanation:
We can solve this question using Boyle's law of ideal gas. The law states that the volume and pressure are inversely proportional when the temperature is constant. At first, the volume is 18L (V1) and the pressure is 87.6 kPa(P1). Then the pressure changed into 48.2 kPa(P2). We are asked to find the volume(V2).
The calculation will be:
P1 * V1= P2 * V2
87.6 kPa *18L = 48.2 kPa * V2
V2= 87.6 kPa *18L / 48.2 kPa
V2=32.71 L
A box sliding down a hill going 3m/s accelerates at 2m/s2. How fast is going after 4 seconds.
Answer: the speed after 4seconds is 11m/s
Explanation:
What is the value, in meters per second squared, of the acceleration of
gravity?
Answer:
9.80665 is the value in meters per second squared
What is a mutation?
Answer:
the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes
Explanation: