a star with an original mass of 8 to 25 solar masses will ultimately become a ?
a) red giant
b)white dwarf
c) neutron star
d)main sequence star
A teacher pushed a 98 newton desk across a floor for a distance of 5 meter he exerted a horizontal force of 20 newton for four seconds
The work done by the teacher in pushing the desk is calculated by multiplying the force exerted (20 newtons) by the distance covered (5 meters), which gives a total work done of 100 joules.
Explanation:To calculate the amount of work done in moving an object, we use the formula: Work = Force x Distance.
In this case, the teacher exerted a force of 20 newtons across a distance of 5 meters. Therefore the work is calculated as: 20N x 5m = 100 joules.
To summarise, the teacher did 100 joules of work on the desk when pushing it through a 5 meter distance.
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The complete question is here:
A teacher pushed a 98 newton desk across a floor for a distance of 5 meters. She exerted a horizontal force
of 20 newtons. How much work was done?
Which color in the visible spectrum has the highest frequency?
Violet waves have the most energy of the visible spectrum.
Remember: c=fλ
Therefore: f=c/λ
Here c is the speed of light in a vacuum.
So:
As wavelength decreases, frequency increases and, as E=hf, where h is constant (Planck's constant), so does the energy that the waves carry. Waves with a short wavelength have the most energy.
Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that.Violet is the color in the visible spectrum that has the highest frequency. (option b)
The visible spectrum consists of various colors that we can see with our eyes, ranging from red to violet. Each color corresponds to a specific wavelength of light. Wavelength is the distance between consecutive peaks (or troughs) of a wave. The frequency of a wave, on the other hand, refers to how many waves pass a particular point in space per unit of time.
The relationship between frequency (f), wavelength (λ), and the speed of light (c) can be described by the equation:
c = f × λ
where c is the speed of light in a vacuum (approximately 3 × 10^8 meters per second), f is the frequency, and λ is the wavelength.
As per this equation, the higher the frequency of light, the shorter the wavelength. Conversely, the lower the frequency, the longer the wavelength.
Hence the correct option is (b),
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Complete Question:
Which color in the visible spectrum has the highest frequency?
a) Blue
b) Violet
c) Green
d) Red
Emily finds a rock with crystals 2 cm large. Her rock _____.
What set of simple machines would be needed to create the complex machine shown here?
A hot water heater is operated by using solar power. if the solar collector has an area of 5.3 m2 , and the power delivered by sunlight is 995 w/m2 , how long will it take to increase the temperature of 1 m3 of water from 20 ◦c to 65 ◦c? the specific heat of water is 4186 j/kg · ◦ c and the density of water is 1000 kg/m3 . answer in units of h.
A straight 1.0 m long wire is carrying a current. the wire is placed perpendicular to a magnetic field of strength 0.20 t. if the wire experiences a force of 0.60 n, what is the current in the wire?
How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.4 μC?
The total number of electrons removed from the neutral silver dollar is [tex]1.5 \times 10^{13}[/tex] electrons.
Charge and ElectronA charge can be defined as a property of any matter that causes it to experience a force when it's placed in an electric or magnetic field. The electron is negatively charged. The value of an electron charge is [tex]1.6\times 10^{-19}\;\rm C[/tex]
Given that the neutral silver dollar has a charge [tex]q = +2.4 \mu \rm C[/tex] .
The charge can be given as,
[tex]q=ne[/tex]
Where n is the number of electrons. Thus,
[tex]n =\dfrac { q}{e}[/tex]
[tex]n = \dfrac {+2.4 \times 10 ^{-6}}{1.6\times 10^{-19}}[/tex]
[tex]n = 1.5 \times 10^{13}[/tex]
Hence we can conclude that the total number of electrons removed from the neutral silver dollar is [tex]1.5 \times 10^{13}[/tex] electrons.
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In a circuit of two lamps in parallel there is 5 v across one lamp. what is the voltage across the other lamp? answer in units of v.
The change in velocity that occurs within an interval of time is known as _____ .
average acceleration
acceleration
instantaneous acceleration
deceleration
What would the potential of a standard hydrogen electrode (s.h.e.) be under the given conditions? [h+]=0.70 mph2=2.4 atmt=298 k?
Why does the sound of something moving away from you seem to change to a lower and lower pitch?
A) As the source moves away, the increased distance creates more interference; so the pitch drops.
B) As the source moves away, the frequency of the sound waves is being compressed, so the pitch drops.
C) As the source moves away, the sound waves speed up to reach the observer; this causes the pitch to drop.
D) As the source moves away, the sound waves stretches out relative to the person standing still; so the pitch drops.
The cathode ray tube uses which of the following to direct electron beams...
A) electric fields
B) bar magnets
C) magnetic fields
D) gravitational field
Also...what did the cathode ray tube allow J.J. Thomson to do?
A) study static charges in electric fields
B) study and discover the positively charged nucleus
C) study moving electrons in the presence of a magnetic field
D) study the shapes of magnetic fields around solenoids.
Thanks! :)
Extend your thinking: household appliances are usually connected in a parallel circuit. why do you think it might be a problem if too many appliances are turned on at once? (hint: current in a wire also produces heat.)
There might be a problem of a lot of power being dissipated if too many
appliances are turned on at once.
We can infer from Ohm's law that as resistance decreases, the total current increases.
I= V/R
The power dissipated through the circuit is directly proportional to the square
of the current.
P= I²R
We can therefore state that the power dissipated via heat will be much when
too many appliances are turned on at once.
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How is the size of a planet related to the thickness of its atmosphere?
A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy
PLEEEEEEASE PPLEASE HELP MEM!?!?!?!!??
Astrologers use the stars to predict the future. This could be considered (2 points) Select one: a. science because we can study the stars. b. science because it is based on beliefs. c. pseudoscience because it involves beliefs not facts. d. pseudoscience because it is backed by scientific studies.
Answer:
I would say the answer is C
Explanation:
Because I don't believe that stars can predict the future (correct me if I'm wrong)
Answer:
C
Explanation:
I did the test
Matter's resistance to a change in motion is called _____ and is directly proportional to the mass of an object. For an object to change its state of motion, a force must be applied to it.
A.Velocity
B.inertia
C.distance
D.area
An electron has kinetic energy 3.00 ev. find its wavelength.
Choose the statement about nuclear fusion that is always correct?
A) Very little energy is released in fusion processes.
B) Due to its instability, 56Fe readily undergoes fusion.
C) Nuclear fusion is an energetically favorable process for lighter atoms.
D) In fusion reactions, a proton and an electron combine to create a neutron.
EDIT: THE ANSWER IS (C)
i will give u BRAINILIEST!!!!
A major consequence of ozone depletion is that
A. certain parts of the earth will become over-vegetated.
B. solar energy will become ineffective.
C. more harmful UV rays will reach the earth's surface.
D. acid rain will increase.
A major consequence of ozone depletion is C. more harmful UV rays will reach the earth's surface due to ozone depletion. The correct option is C.
A major consequence of ozone depletion is that more harmful ultraviolet (UV) rays will reach the Earth's surface (Option C). Ozone depletion in the stratosphere allows increased penetration of UV-B and UV-A radiation, which can have adverse effects on human health, ecosystems, and the environment. Excessive UV exposure can lead to skin cancer, cataracts, and other health issues in humans.
It can also harm marine life, crops, and forests, disrupting ecosystems and food chains. Stratospheric ozone depletion does not directly cause over-vegetation (Option A), render solar energy ineffective (Option B), or increase acid rain (Option D). Addressing ozone depletion through international agreements like the Montreal Protocol is crucial to mitigate its harmful impacts on the planet and its inhabitants.
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Which of the following states that all matter tends to "warp" space in its vicinity and that objects react to this warping by changing their paths?
Newton's Universal Law of Gravitation
Einstein's General Relativity
Einstein's Special Relativity
Newton's First Law of Motion
Answer:
Einstein's General Relativity
Explanation:
The above statement is an interpretation of Einsteins General theory of relativity. The theory of relativity states that all matter tends to wrap space in its vicinity and objects respond to this warp by changing their paths. The matter has mass and because of this mass the space in its vicinity is warped. The time space according to Einsteins is a streched fabric.
Why do clothes often cling together after tumbling in a clothes dryer? 1. the dryer heat caused some of the fabrics to melt together. 2. gravitational force 3. air pressure 4. the clothes are electrically neutral. 5. electrical force?
A load absorbs s = 28 kva at a leading power factor of pf = 0.79. use this information to calculate the average (p) and reactive (q) power for the load. enter comma separated numerical answers with three significant figures.
According to the Big Bang theory, _____. A)Earth's moon was created from a collision with MarsB) the universe was created from a cosmic explosion C) our solar system is shrinking and will eventually collapse into the sun D) in about 5 billion years, the sun will swell and engulf the inner planets
The answer is B. the universe was created from a cosmic explosion.
It is called the Big Bang Theory, but actually there was no REAL explosion. What happened was the universe expanded from a really dense and hot superforce. There were no stars, atoms, and the like. This point was called "singularity,"- a mass that contained all the mass, and the space-time of the universe.
A metallic object is given a positive charge by the process of induction, as illustrated in Figure 18.8. (a) Does the mass of the object increase, decrease, or remain the same? Why? (b) What happens to the mass of the object if it is given a negative charge by induction? Explain.
In the absence of air resistance and friction, what will happen to the velocity of an object going at 20 m/s E?
When a bow an arrow is fired, how does the size of the force of the bow on the arrow compare of the arrow on the bow
Final answer:
The force of the bow on the arrow is equal and opposite to the force of the arrow on the bow, complying with Newton's Third Law. The energy to shoot an arrow comes from converting kinetic energy to potential energy, and then back to kinetic energy upon release. Projectile range is affected by the angle of release and external factors like wind.
Explanation:
When a bow and arrow is fired, the size of the force of the bow on the arrow is equal to the size of the force of the arrow on the bow. This is due to Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. In terms of archery, when the archer releases the string, the potential energy stored in the bow is transferred to the arrow, propelling it forward. At the same time, the bow experiences an equal and opposite force.
Energy and Projectile Motion
The energy it takes to shoot an arrow involves converting kinetic energy from pulling the string into potential energy stored in the string. Upon release, this potential energy turns back into kinetic energy, which determines the speed and range of the arrow. For a fixed initial speed, the range of a projectile like an arrow is determined by the angle of release. The smaller angle is often preferable due to minimal air resistance and other factors like wind, while a larger angle may be useful to shoot over obstacles or reach longer distances, as with a football punter using a higher trajectory to maximize hang time.
What determines the range of spectral lines produced during electron transition? the higher energy level to which the electron jumps the lower energy level to which the electron returns the total number of energy levels the electron can jump to the number of electrons under electronic transition at the same time
Answer:
the total number of energy levels the electron can jump to.
Explanation:
A mechanical high-speed bat is flying along a path perpendicular to a wall. it emits a sound with a frequency f0 . the night is clear and the air is still. let the speed of sound waves in the still air be vs . the bat hears a sound wave reflected from the wall with a frequency fnew . from this information one can determine the speed vbat at which the bat is flying. install a detector at the wall. 0 bat f v what is the detected frequency? 1. f1 = vs + vbat vs f0 2. f1 = vs vs − vbat f0 3. f1 = vs vs + vbat f0 4. f1 = vs + vbat vs − vbat f0 5. f1 = 2 vs vs − vbat f0 6. f1 = vs − vbat vs f0 7. f1 = vs − vbat vs + vbat f0 8. f1 = f0 9. f1 = 2 vs vs + vbat f0
The detected frequency f1 can be calculated using the Doppler effect formula, which leads to the conclusion that option 3 is the correct answer (f1 = vs / (vs + vbat) * f0). This equation allows to determine the actual speed of the bat.
Explanation:This question can be addressed using the Doppler effect principle, which describes how the frequency of sound changes for an observer moving in relation to a sound source.
Given that the bat is moving perpendicular to the wall with the speed vbat and since the night is clear and air is still (meaning no additional obstructions in the sound path), the detected frequency f1 can be calculated using the Doppler effect formula:
f1 = vs / (vs + vbat) * f0.
Therefore, option 3 is the correct answer. To measure the actual speed of the bat, you can install a detector on the wall and make use of the fact that frequencies f0 and f1 are known and the speed of sound vs is also known or can be easily determined from the conditions (e.g., air temperature).
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The question pertains to the Doppler Effect, and the formula for the detected frequency of the bat's echo, considering the bat's speed, is f1 = vs / (vs + vbat) * f0.
Explanation:The question deals with the concept of the Doppler Effect in physics. This effect relates to the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. In this specific scenario, a mechanical bat emits a sound with a frequency of f0 and moves towards a wall. The sound wave reflects off the wall and returns to the bat. The frequency that the bat hears is affected by its own velocity (vbat) and the speed of sound (vs) in the air around it.
Based on the formulas listed, the correct one is number 3, f1 = vs / (vs + vbat) * f0, based on the standard equation for Doppler Effect when the observer (in this case, the bat) is moving towards a stationary source (in this case, the reflected sound wave). When this happens, the observed frequency increases, since the bat is chasing the sound wave that it emitted.
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