What is the unit of work? Explain whether the unit of work is a fundamental uintor derived unit
1.
What do you mean by a unit?
2.
unit or a derived unit.
are the fundamental units used in physics?
al Bureau of Weights and Me
Answers
Answer:
1)the unit of work is joule. 2)it is derived unit because it is made by two different unit force and displacement .3)
Related Questions
Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.Which best explains why Denise had fewer injuries to the area of her body that hit the grass? The grass did not exert a reaction force. The grass did not exert an action force. The grass shortens the time of the collision. The grass extends the time of the collision.
Before starting this problem, review Conceptual Example 3 in your text. Suppose that the hail described there comes straight down at a mass rate of m/?t = 0.030 kg/s and an initial velocity of v0 = -15 m/s and strikes the roof perpendicularly. Suppose that the hail bounces off the roof of the car with a velocity of +15 m/s. Ignoring the weight of the hailstones, calculated the force exerted by the hail on the roof. __________N
Explain how the atoms of the element helium are formed in a star Please
Water _____. 1 has a pH value of 0 2 dissolves in most substances 3 is made of helium and oxygen 4 becomes less dense when it freezes
b. periodic condensations and rarefactions.
c. high- and low-pressure regions.
d. all of the above E. none of the above
Answers
Final answer:
Sound waves in air are a series of periodic condensations and rarefactions.
Explanation:
Sound waves in air are a series of periodic condensations and rarefactions. When a sound is produced, it creates compression regions (areas of high pressure) and rarefaction regions (areas of low pressure) that propagate through the air. These alternating regions of high and low pressure create the characteristic waveform of the sound wave.
Learn more about Sound Waves here:
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b. The dark lines are at higher energies than the bright lines.
c. The bright lines are at higher energies than the dark lines.
d. You cannot relate the two types of spectra.
Answers
Wouldn't it be neat if an electron falling closer to the nucleus ... emitting a
photon ... actually gave out more energy than it needed to climb to its original
energy level by absorbing a photon ! If there were some miraculous substance
that could do that, we'd have it made.
All we'd need is a pile of it in our basement, with a bright light bulb over the pile,
connected to a tiny hand-crank generator.
Whenever we wanted some energy, like for cooking or heating the house, we'd
switch the light bulb on, point it towards the pile, and give the little generator a
little shove. It wouldn't take much to git 'er going.
The atoms in the pile would absorb some photons, raising their electrons to higher
energy levels. Then the electrons would fall back down to lower energy levels,
releasing more energy than they needed to climb up. We could take that energy,
use some of it to keep the light bulb shining on the pile, and use the extra to heat
the house or run the dishwasher.
The energy an electron absorbs when it climbs to a higher energy level (forming
the atom's absorption spectrum) is precisely identical to the energy it emits when
it falls back to its original level (creating the atom's emission spectrum).
Energy that wasn't either there in the atom to begin with or else pumped
into it from somewhere can't be created there.
You get what you pay for, or, as my grandfather used to say, "For nothing
you get nothing."
Final answer:
The dark absorption lines of an atom's spectrum correspond to the same energies as the bright emission lines. They both reflect energy changes in electron states.
Explanation:
The dark lines of an atom's absorption spectrum are at the same energies as the bright lines of its emission spectrum, therefore the correct answer is a. The bright lines are at the same energies as the dark lines. Absorption spectra are produced when electrons absorb energy and move to a higher energy level, while emission spectra are observed when electrons lose energy and return to a lower energy level.
The dark lines (absorption) and bright lines (emission) coincide because the energy required to move an electron from a lower to higher energy level matches the energy released when an electron drops from a higher to lower state.
Learn more about Absorption and Emission Spectra here:
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about the size of a pen
B.
about the size of a virus or a large molecule
C.
about the size of an amoeba
D.
smaller than an atom
E.
about the size of a football field
Answers
Answer:
this is the correct answer
Explanation:
Answer:
sorry about the other person but its b
Explanation:
b. the north end of Earth’s axis is tilted away from the sun.
c. the north end of Earth’s axis is tilted toward the sun.
d. Earth’s axis is parallel to the sun’s rays.
Answers
Answer: The correct answer is Option a.
Explanation:
An equinox is defined as an event that occurs when Sun's rays fall on the equator at noon and at an angle of 90°.
The axis of rotation of Earth must be perpendicular to the Sun's rays for this event to occur.
If the axis is titled to some angle even, then equinox will not occur.
Hence, the correct answer is Option a.
B).The Earth is Round
C).Force of Gravity Between 2 objects Decreases with Distance
D).Planets Move in circles
Answers
Kepler's first "law":
The orbits of the planets are ellipses, with the sun at one focus.
This would include Mars.
Answers
The Average Speed over the entire trip is 3.671 meters per second.
The person is moving in a straight line at a constant Speed. Let suppose that Distance between points A and B is , then we construct and use the Kinematic formulas for each stage of the travel to determine Times and Average Speed, based on the fact that Speed is inversely proportional to Time, we derive the resulting expression:
First Stage (from point A to point B):
(1)
Second Stage (from point B to point A):
(2)
Average Speed:
(3)
Where:
- Travelling time for the first stage, in seconds.
- Travelling time for the second stage, in seconds.
- Distance from A to B, in meters.
- Speed of the person in the first stage, in meters per second.
- Speed of the person in the second stage, in meters per second.
- Average speed, in meters per second.
By applying (1) and (2) in (3), we derive an expression to determine the Average Speed:
(4)
If we know that and
, the average speed over the entire trip is:
The Average Speed over the entire trip is 3.671 meters per second.
Please see this question related to Average Speed for further details: brainly.com/question/19335778
we know wacth:
Speed = distance / time.
Consider that:
distance from point A to point B=distance from point B to point A=d
We calculate the time to go from point A to point B.
time=distance / speed.
T₁=d / (5 m/s)
We calculate the time to go from point B to point A.
T₂=d / (2.9 m/s)
Therefore; the total time wil be: T₁+T₂
Total time=d/(5 m/s) + d / (2.9 m/s)
Least common multiple=(5 m/s)(2.9 m / s)=14.5 m²/s²
Total time=(2.9 m/s d + 5 m/s d)/ 14.5m²/s²
Total time=[(7.9 d) m/s] / (14.5 m²/s²)
Total time=7.9 d/ (14.5 m/s)
Now, the total distance will be =d+d=2d
Therefore:
Average speed=total distance / total time
Average speed=[(2d)] / [(7.9 d)/ (14.5 m/s)]
Average speed≈3.67 m/s.
Answer: the average speed will be ≈3.67 m/s.