Explanation:
Efficiency is a way of describing the amount of useful output a process or machine can generate as a percentage of the input required to make it go. In other words, it compares how much energy is used to do work versus how much is lost or wasted to the environment. The more efficient the machine, the less energy wasted.
For example, if a heat engine is able to turn 75 percent of the fuel it receives into motion, while 25 percent is lost as heat in the process, it would be 75 percent efficient. Out of the original 100 percent of the fuel, 75 percent was output as useful work.
the equation:
energy efficiency =useful output energy/total input energy
1. Which of the following transformations is an example of a β−-decay?
2.The unstable uranium nuclide 238 92U has a half-life of 4.5 billion years and decays into the thorium nuclide 234 90Th. The thorium daughter nuclide has a half-life of 24.1 days and decays into the protactinium nuclide 234 91Pa, which has a half-life of 6.75 hours and decays into 234 90U, whose half-life is 245 thousand years. In a sample of uranium-containing rock, of the four nuclides the most abundant will be __________.
3. The beta minus decay process 13 7N→13 6C+β−+ν¯¯¯ is proposed in which nitrogen’s proton becomes a neutron. The process is not possible because:
4.The fact that the relative abundance is greater for elements in which the total number of protons and neutrons is a multiple of two is because __________.
Answer:
1. C: 31/14 Si becomes 31/15 because a nuetron
2. A: 238 92U because the very long half-life means a very small rate of decay
3. D: Charge conservation is not satisfied
4. B: of the four nuclear decay processes only the α-decay changes the baryon number and does so in increments of four
Explanation:
I just took the quick check. Enjoy the answers I did not get to have
A car decelerates uniformly from 20 m s' to
zero in a time interval of 2.0 s. What are its
acceleration and distance travelled during this
time interval?
Describe the different components of Kabuki and explain their uses
Answer:
Like the three kanji characters that make up the word, kabuki consists of ka (singing), bu (dancing) and ki (skill). In addition to these three components, kabuki is characterized by unique stage sets such as a revolving platform that allows for nearly instant set changes and a runway that stretches into the audience.
COME AND HELP ME
The noble gases are unreactive and stable. Which of the following explains why this is true?
They each have no electrons.
They have 8 electrons in their outer shell (except for Helium).
They have only neutrons in their nucleus
They have more electrons than other elements.
Answer:
They have 8 electrons in their outermost shell(except for Helium)
Explanation:
The noble gases are unreactive and stable because they have completely filled orbitals and have 8 electrons in their outermost shell.
Therefore
They have 8 electrons in their outermost shell(except for Helium)
Mechanical energy is as much of potential and kinetic energy. Mechanical energy is never lost but only transformed from one form to another. As long as all the mechanical energy is as much as the potential energy then the kinetic energy is 0J. The mechanical energy of an object is found by summing its potential energy and kinetic energy.
7. The outlets in your home provide
a. direct current.
b, alternating current.
c. electric discharge.
d. static electricity.
Make me as brainliest
Answer:
b
Explanation:
The outlets in your home provide alternating current. An example of a direct source would be a battery.
physics 5
physics geniuses where r u need help!!!
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pls also check other questions!
Answer:
0.85 A
Explanation:
the effective current is 0.85 A
When the pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element?.
Please hellllooooppp
Answer:
to the east i would say as i have tryed looking it up and carnt fimd the answer so i would saythe east or the north
Explanation:
you should choose as i dont no as it is a toss between those two
How long does it take light to reach Earth from an object on light-year away?
Answer:
The short answer is that it takes sunlight an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.
Explanation:
how long does it take sunlight to reach Earth? This sounds like a strange question, but think about it. Sunlight travels at the speed of light. Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. If the Sun suddenly disappeared from the Universe (not that this could actually happen, don't panic), it would take a little more than 8 minutes before you realized it was time to put on a sweater.
Two charges are separted by a distance d and exert mutual attractive forces of f on each other. If the charges are separated by a distate of 2d what are the new mutual forces?
The new force between the charges when the distance become 2d will be F'=4F
What is electrostatic force?
When two charged particles are separated by the distance d then the force of attraction or repultion acts on the charged particle depending upon the nature of the charge whether it is positive or negative.
The formula for the electrostatic force is given by
[tex]F=\dfrac{kq_1q_2}{d^2}[/tex]
Now if the value of d becomes 2d then the formula will become:
[tex]F'=\dfrac{kq_1q_2}{(2d)^2}=\dfrac{kq_1q_2}{4d}[/tex]
[tex]\dfrac{F'}{F}=\dfrac{1}{4}[/tex]
[tex]F=4F'[/tex]
Hence the new force between the charges when the distance become 2d will be F'=4F
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What causes refraction as waves move from one medium to another?.
The cause of refraction as waves move from one medium to another is : Change in speed of Light
Meaning of RefractionRefraction can be defined as the change in direction of a wave as it passes from one medium to another medium.
Refraction is observed in many wave form but it is more prominent and visible when it comes to light wave.
In conclusion, The cause of refraction as waves move from one medium to another is : Change in speed of Light
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An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is a and the total mechanical energy of the system is e
An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The system's potential energy when kinetic energy of (3/4) E is (1/8) k A².
What is mechanical energy?Mechanical energy is the sum of potential energy and kinetic energy.
Total mechanical energy = P.E max = K.E max
Total mechanical energy = K.E +P.E
Given is the kinetic energy is (3/4)E.
E= (3/4)E + P.E
P.E = (1/4) E
Maximum potential energy =E = (1/2) k A²
Here. A is the maximum displacement and k is the spring constant.
The potential energy at kinetic energy of (3/4) E is
P.E = (1/4)E = (1/8) k A²
Therefore, the system's potential energy when kinetic energy of (3/4) E is (1/8) k A².
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