Answer:
luminosity
Explanation:
Answer:
The answer would be B.) Luminosity.
Explanation:
The luminosity of a star is basically, as the question says, the total energy output of a star per second. The luminosity is also the brightness of a star. If a star has a lot of energy, the star would be bright.
explain how a maglev train provides evidence that magnetic fields can apply forces between objects that do not touch.
Answer:
Powerful electromagnets are fitted on top of guideways either ttract or repel the magents fitted on the bottom of train. The froce of attraction/repulsion rasies the train in hovering position.
Explanation:
Magentic fields exist between two opposite/like poles. The poles do not have to be touching each other. They can be separated by a distance in a medium that doesn' block magnetic field.
In magelv train the magnetic forces between two poles are used to operate the train. The two poles are separated by train body and air.
A longitudinal wave is observed to be moving along a slinky. Adjacent crests are 2.4 m apart. Exactly 6 crests are observed to move past a given point in 9.1 s. Determine the wavelength, frequency, and speed of this wave.
Answer:
The wavelength is 2.4 m (the distance between crests). The frequency is 0.66
Hz (6 crests/sec / 9.1 s). The speed of the wave is 0.66 * 2.4m = 1.58 m/s.
Explanation:
The wavelength, frequency and speed of the given wave is required.
The wavelength of the wave is 2.4 m
The frequency of the wave is 0.659 Hz.
The speed of the wave is 1.582 m/s.
The distance between adjacent crest is 2.4 m.
This is the wavelength of the wave.
[tex]6\ \text{crest}=9.1\ \text{s}[/tex]
[tex]1\ \text{s}=\dfrac{6}{9.1}=0.659\ \text{Hz}[/tex]
The velocity of the wave is the product of wavelength and frequency
[tex]2.4\times \dfrac{6}{9.1}=1.582\ \text{m/s}[/tex]
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The placebo effect happens when:
O
A. an individual is affected by the experimental treatment.
O
B. an individual participates in a survey and changes his or her
behavior.
O
C. an individual takes an inert substance, like a sugar pill, and feels
better after taking it.
O
D. an individual interferes in an observational study.
Answer:
C
Explanation:
A box contains about 5.64 x 1021 hydrogen
atoms at room temperature 21°C.
Find the thermal energy of these atoms.
Answer in units of J.
Answer:
Explanation:
Given that,
The temperature of atom is 21°C
θ = 21 + 273 = 294K.
Then, from kinetic theory,
The kinetic energy of individual elements is
K.E = 2kT/3
k is Boltzmann constant
k = 1.38 × 10^-23 J/K•particle
Then,
K.E = 2 × 1.38 × 10^-23 × 294 / 3
K.E = 2.7048 × 10^-21 J/particle
Each particle of hydrogen is 5.64 × 10²¹ particle
Total K.E = 2.7048 × 10^-21 × 5.64 × 10²¹
Total K.E = 15.26 J
A student is writing a paper on her laptop while sitting on her couch. After some time the student feels her computer getting warm. Which of the following is most likely the explanation for this observation
The warmth felt by the student from her laptop most likely results from the heat generated by the computer's internal components. This is a common occurrence exacerbated by potentially blocked cooling vents when the laptop is used on a soft surface like a couch.
Explanation:When the student feels her laptop getting warm, it is most likely due to the heat generated by the computer's components as they work. Computers convert electrical energy into computational power, and during this process, some energy is lost as heat. This is a typical thermal phenomenon where the electronic components, like the CPU and GPU, produce heat as a byproduct of their operation. As more processes run on the laptop or the more intensive the tasks, the more heat is generated. This heat is usually dissipated by cooling mechanisms such as fans or heat sinks. However, when using a laptop on a soft surface like a couch, its cooling vents might be obstructed, which can cause the system to become warmer than it would on a hard, flat surface.
The scientific method might be applied to this observation by proposing hypotheses and conducting experiments. For example, a hypothesis could be, 'The laptop is warm because its cooling vents are blocked while sitting on the couch.' A relevant prediction in line with the hypothesis could be, 'If the laptop is placed on a flat, hard surface where its vents are unobstructed, then it will cool down and be less warm to the touch.' Testing such a prediction by observation and experimentation gives insight into the causes of thermal phenomena.
Write a reflection about what you learned and how you can reduce your carbon footprint (ecological footprint)
Answer:
You could say that you learned that humans effect the ecosystem and many big ways. You can reduce ur footprint by recycling, riding bikes instead of cars, and eating more fruits and vegetables
Explanation:
A circular loop of radius r is rotated through a magnetic field B, which of the following would increase the magnetic flux through the loop by a factor of 16?
Doubling B and quadrupling r.
Quadrupling B and doubling r.
B remains constant and quadrupling r.
Doubling B and doubling r.
Answer: B
Explanation: I think
The correct option that would increase the magnetic flux through the loop by a factor of 16 is quadrupling B and doubling r.
The correct option that would lead to an increase in the magnetic flux through the loop by a factor of 16 corresponds to statement: Quadrupling B and doubling r.
To understand this, let's break it down:
Doubling B and quadrupling r: 2 × 4 = 8
Quadrupling B and doubling r: 4 × 2 = 8
B remains constant and quadrupling r: 1 × 4 = 4
Doubling B and doubling r: 2 × 2 = 4
Thus, only quadrupling B and doubling r would lead to an increase in the magnetic flux through the loop by a factor of 16.
A wave has an amplitude of 0.0800 m and is moving .33 m/s . One oscillator in the wave takes 0.115 s to go from the lowest point in its motion to the highest point. Find the period of the wave.
Answer:
0.230 s
Explanation:
The period is the length of time from one peak to the next. If it takes the oscillator 0.115 s to go from the lowest point to the highest point, then it takes another 0.115 s to return to the lowest point. So the period is 0.115 + 0.115 = 0.230 seconds.
The period of the wave, based on the student's observation of a half-cycle taking 0.115 seconds, is calculated to be 0.230 seconds by doubling this time for a full cycle.
Finding the Period of a Wave
The student has observed that one oscillator in a wave takes 0.115 seconds to go from the lowest point to the highest point in its motion. This is half the time of a full oscillation, as it must go from the lowest point to the highest point, and back down again to complete one cycle. Therefore, to find the period of the wave, we must double that amount of time. Thus, the period (T) of the wave is:
T = 2 x 0.115 s = 0.230 s
How far does an object move if a 20 N force is applied to it doing 40 J of work?
Answer: The object moved 2 metres away
Explanation:
Given that the
Force applied F = 20 N
Work done W = 40 J
From the definition of workdone which state that: product of force and distance
W.D = F × S
Where S = distance
S = W.D/F
S = 40/20 = 2 metres
The object moved 2 metres away.
[OU.03] What is the best method to increase the accuracy of the parallax measurement of star distances?
Answer: Trigonometric or Stellar Parallax
Explanation:
Whenever a star is too far away to measure its parallax, astronomers do match its color and spectrum to one of the standard candles and determine its intrinsic brightness.
Comparing this to its apparent brightness, they can get a good measure of its distance by applying the 1/r^2 rule.
Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. They measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
As one goes from left to right in a period, which of the following is true?
A. The number of protons decreases.
B. The number of valence electrons increases.
C. both A and B
D. none of the above
Answer:
The correct answer is C , because it increases and decreases
Explanation:
As one goes from left to right in a period on the periodic table, the number of protons increases while the number of valence electrons remains the same or slightly increases.
Explanation:As one goes from left to right in a period on the periodic table, the number of protons increases while the number of valence electrons remains the same or slightly increases.
This pattern is observed because the number of electrons in the energy levels fills up as you move across the period, and the number of protons in the nucleus also increases. The increase in protons leads to a greater positive charge in the nucleus, which attracts more electrons, resulting in a tendency for the number of valence electrons to increase or remain the same.
Therefore, the correct answer is option D: none of the above, as neither the number of protons nor the number of valence electrons decreases consistently as one goes from left to right in a period.
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It takes 300 N to move a box 10 meters in 10 seconds. How much power is
required?
O A. 100 W
O B. 3,000 J
C. 30,000 W
O D. 300 W
Answer:
I do t really know what's the answer but try it your self not uo but rude
What is a tiny sheet of silicon containing an entire circuit with many different components? A. a binary circuit B. a coded circuit C. an integrated circuit D. a stationary circuit
The correct answer is C an integrated circuit.
Integrated circuits are tiny silicon sheets containing many components vital for modern electronics. They revolutionized technology by enabling miniaturization and high functionality in devices.
The correct answer is C. an integrated circuit. An integrated circuit is a tiny sheet of silicon that contains an entire circuit, including many different components such as transistors and diodes. These circuits are etched onto the silicon surface and are essential components in modern electronic devices, as they can hold billions of nanoscale components needed for various functions.
Integrated circuits revolutionized the way electronic devices are made, allowing for significant miniaturization and complexity in devices like computers and cell phones. The invention of the integrated circuit enabled the modern computer revolution by allowing vast amounts of electronic circuitry to fit into small chips, instead of requiring large rooms for the same technology.
Which statement uses the terms velocity and acceleration correctly?
A. Acceleration is the rate of change of velocity.
B. An object with a constant velocity cannot accelerate.
C. Acceleration is always in a straight line.
D. Acceleration is an increase in velocity.
E. Acceleration happens only in the same direction as the object is moving.
Option A: Acceleration is the rate of change of velocity.
Explanation:The statement that uses the terms velocity and acceleration correctly is option A: Acceleration is the rate of change of velocity. Acceleration is defined as the change in velocity over time, so it represents how quickly the velocity is changing. Option B is incorrect because even though an object with constant velocity has no change in speed, it can still accelerate if it changes its direction. Option C is also incorrect because acceleration can occur in any direction. Option D is incorrect because acceleration can be a decrease in velocity as well. Option E is incorrect because acceleration can happen in any direction.
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A force that pushes or pulls is known as
O A.
an expected force.
B.
a reaction force.
OC.
an applied force.
a positive force.
Answer:
C
Explanation:
An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person.
Answer:
C:
Explanation:
any force acting on an object is a positive force I believe.
3. A pendulum with a 1.0-kg weight is set in motion from a position 0.04 m above the lowest point on the path of the weight.
What is the kinetic energy of the pendulum at the lowest point?
(Hint: Assume there is no friction.)
Answer: K.E = 0.4 J
Explanation:
Given that:
M = 1.0 kg
h = 0.04 m
K.E = ?
According to conservative of energy
K.E = P.E
K.E = mgh
K.E = 1 × 9.81 × 0.04
K.E = 0.3924 Joule
The kinetic energy of the pendulum at the lowest point is 0.39 Joule
Final answer:
The kinetic energy of the pendulum at the lowest point is 0.392 J, which is found by converting the initial gravitational potential energy into kinetic energy using the principle of conservation of energy.
Explanation:
To determine the kinetic energy of the pendulum at the lowest point, we use the principle of conservation of energy, which states that the total mechanical energy in a system remains constant if there is no friction.
We know that the pendulum starts with gravitational potential energy which is completely converted into kinetic energy at the lowest point. The potential energy (PE) at the starting point is due to its height above the lowest point and is calculated as PE = mgh where m is the mass, h is the height, while g is the acceleration brought on by gravity (9.8 m/s²).
Let's calculate the potential energy at the initial height:
PE = mgh
= (1.0 kg)(9.8 m/s²)(0.04 m)
= 0.392 J
Since there is no friction, this potential energy will be entirely converted into kinetic energy (KE) at the lowest point. Therefore, the kinetic energy at the lowest point is also 0.392 J.
1. What type of rocket is not associated with Werner von Braun? A. V - 1 B. V - 2 C. Saturn 5 D. Delta II
Answer:
Saturn V
Explanation:
I'm 100 percent sure of this
It's the Delta II ... the newest one on the list.
The first launch in the Delta program was in 1987 ... 10 years after von Braun's death.
Which tectonic plate boundary caused the structure that is circled in the image?
Answer:
Crust
Explanation:
Ahmed saw all of these things as he walked to school this morning. Which one is an example of a force pushing downward toward the ground?
A. A bird sat on a telephone wire.
B. A woman moved her child from one place to another in a wagon.
C. A man pulled weeds in his garden
D. A dog tugged on a rope a child held
Using the text and the lab results, can you identify the TRUE statements?
The instantaneous speed of the car at 40 cm was about 2cm/sec.
The speed of the car increased during the 100 cm trip.
The straight line in the graph indicates that the speed during the trip was constant.
Every two seconds the wind-up car moved about 20 cm.
The data tells us that it takes the wind-up car about 50 seconds to travel 100 cm.
Without the actual text and lab results, it's not possible to definitively confirm these statements. They involve concepts of physics including instantaneous speed, acceleration, constant speed, and average speed. Understanding these terms can aid in evaluating the claims.
Explanation:In the absence of the actual text and lab results, it's impossible to definitively evaluate the truth of these statements. However, here's a general understanding of what each would mean:
The instantaneous speed of the car at 40 cm was about 2 cm/sec. - This means at the very moment when the car had traveled 40 cm, it was moving at a rate of 2 cm every second.
The data tells us that it takes the wind-up car about 50 seconds to travel 100 cm. - This implies an average speed of 2 cm/sec.
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Match the term with the appropriate image.
(a) The object position is represented by the first image.
(b) The focal length of the mirror is represented by the last image.
(c) The image position is represented by the second image.
Object position in the mirror
The position of the object in the mirror is represented by an upward arrow. The object is this question is the upward arrow towards left hand side.
Image formed by the mirrorThe image formed by the mirror in this question is inverted and it is represented by an downward arrow towards the left.
What is focal length?This is the distance between the lens and the focal point. The last image in the diagram represents the focal length of the mirror.
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___ discharge occurs when oppositely charged objects get close enough for the air between them to become electrically charged.
Answer:
Static discharge
Explanation:
Static discharge occurs when oppositely charged objects get close enough for the air between them to become electrically charged causing electrons to flow between the oppositely charged objects leading to spark. The flow of the electron is from one charged body to another charged body is what causes the static discharge.
Charges can be built through friction, this buildup of electric charges is known as static electricity.
Electrical discharge occurs when the electric field between oppositely charged objects exceeds about 3 * 10⁶ V/m, ionizing the air and enabling a current to flow in the form of sparks or corona discharge.
The phenomenon being described is known as electrical discharge, which occurs when oppositely charged objects are brought close enough together for the air between them to become electrically conductive. When the electric field between these objects exceeds a certain threshold - about 3 * 10⁶ V/m for air - the air molecules become ionized. This leads to the flow of current and discharge in the form of sparks, like lightning, or a more gradual event known as corona discharge.
When this happens, if air was ohmic, the current would increase steadily as the voltage difference increased. However, gases are generally nonohmic, so there is zero current until the voltage reaches a point where the electrical forces tear electrons away from air molecules. Subsequently, these free electrons and positive ions create a cascade that ionizes more air molecules, resulting in an impressive electrical discharge.
An object gains a negative charge by accumulating electrons, while losing electrons makes it positively charged. In nature, we see this during thunderstorms, where the friction between water and air particles in thunderclouds creates huge charges. The sudden release of these accumulated charges towards the ground is what we witness as a dangerous lightning strike.
3. A wave in a 12m rope is shown in a diagram in one second
l<--------------- 12m
a) What is the wavelength of this wave
b) If the frequency of the wave is 2 Hz, what is the wave speed?
The wavelength of the wave in the 12m rope could be 12 meters if the wave spans the entire length of the rope. The wave speed is calculated to be 24 m/s when frequency is 2 Hz and assuming the wavelength is 12m. Similar methods apply for other wave speed calculations.
Explanation:To answer the student's questions:
a) The wavelength of a wave in a 12 m rope is not given explicitly in the question. However, if it is implied that the wave spans the entire length of the rope, then the wavelength would be 12 meters.b) The wave speed can be calculated using the formula: wave speed = frequency × wavelength. Given that the frequency of the wave is 2 Hz, and assuming the wavelength is the length of the rope (12 m), the wave speed would be 2 Hz × 12 m = 24 m/s.For another example, question 38 stated: "Scouts at a camp shake the rope bridge they have just crossed and observe the wave crests to be 8.00 m apart. If they shake the bridge twice per second, what is the propagation speed of the waves?" The propagation speed would be the frequency (2.00 Hz) multiplied by the wavelength (8.00 m), giving 16.00 m/s.
a. If 0.45 kg of iron at 140°C is added to 1.5 kg of water at 22°C, what will be the final temperature of the system? (4 points)
Answer:
25.67 °C
Explanation:
From the question,
Heat lost by iron = heat gained by water
c'm'(t₁-t₃) = cm(t₃-t₂)................ Equation 1
Where c' = specific heat capacity of iron, m' = mass of iron, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature of iron, t₂ = initial temperature of water, t₃ = temperature of the system.
make t₃ the subject of the equation
t₃ = (c'm't₁+cmt₂)/(c'm'+cm).............. Equation 2
Given: m' = 0.45 kg, t₁ = 140 °C, t₂ = 22 °C, m = 1.5 kg
Constant: c' = 450 J/kg.K, c = 4200 J/kg.K
Substitute these values into equation 2
t₃ = (0.45×450×140+1.5×4200×22)/(450×0.45+4200×1.5)
t₃ = (28350+138600)/((202.5+6300)
t₃ = 166950/6502.5
t₃ = 25.67 °C
The direction of the magnetic field produced by an electric current will change when the direction of the ______ changes.
Answer:
Current
Explanation:
Your welcome
Answer:
Current
Explanation:
at which velocity would you expect an object to have the greatest amount of kinetic energy? a. 11-20 m/s b.0-10 m/s c. 21-30 m/s d. 31-40 m/s
Answer:
31-40 m/s
Explanation:
The kinetic energy of an object is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
m is mass of the object
v is velocity
If mass of an object is constant, its kinetic energy depends only on velocity. It means if the velocity is more, it will have maximum kinetic energy. For the interval of 31-40 m/s, the kinetic energy of the object is maximum.
Need help now due in 5 minutes
Answer:
I'm positive it's the last one
Explanation:
A beam of yellow monochromatic light passes from quartz (n = 1544) into
water (n = 1333). In the water, the beam makes an angle of 35.0° with the
normal. When the beam is traveling in the quartz, what angle does it for with
the normal? (A) 25.1 (B).29.8 (C)38.9 (D) 20.6
Answer:
CANT SOO SORRY
Explanation:
Answer:
The answer is 29.8 (b)
Explanation:
I just took a quiz with this question on there and this was the answer.
A car has a force of 2000N and a mass of
1000kg. What is the acceleration of the
car?
Answer:
2 m/s
Explanation:
The acceleration of the car is 2 m/s².
What is acceleration?
Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
Force acting on the car; F = 2000N.
Mass of the car; M = 1000 kg.
From Newton's second law of motion, we know that:
Force = mass× acceleration.
⇒ acceleration = Force/mass = 2000/1000 m/s² = 2 m/s².
Hence, the acceleration of the car is 2 m/s².
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The sound from a loud speaker has an intensity level of 80 db at a distance of 2.0m. Consider the speaker to be a point source, how far from the speaker will the sound have an intensity level of 40 db.
Answer:
2.83m
Explanation:
The information that we have is
Intensity at 2.0 m: [tex]I=80dB[/tex] and [tex]r_{1}=2m[/tex]
we need an intensity level of: [tex]I_{2}=40dB[/tex]
thus, we are looking for the distance [tex]r_{2}[/tex].
which we can find with the law for intensity and distance:
[tex](\frac{r_{2}}{r_{1}} )^2=\frac{I_{1}}{I_{2}}[/tex]
we solve for [tex]r_{2}[/tex]:
[tex]\frac{r_{2}}{r_{1}}=\sqrt{\frac{I_{1}}{I_{2}} }\\\\r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}} }[/tex]
and we substitute the known values:
[tex]r_{2}=(2m)\sqrt{\frac{80dB}{40dB} }\\\\r_{2}=(2m)\sqrt{2}\\ r_{2}=2.83m[/tex]
at a distance of 2.83m the intensity level is 40dB