1. An elevator is moving up at a constant velocity of 2.5 m/s, as illustrated in the
diagram below: The passenger has a mass of 85 kg,
a. Construct a force diagram for the passenger
Some trains use a system known as maglev instead of wheels. In one version of maglev, magnets inside the track act on magnets inside the train, and when the train is at full speed it never touches the ground. The magnets never touch, but the force between them can be changed by adjusting the amount of current flowing through the train’s control system. What force do these maglev trains reduce by using magnets?
elastic
electrical
friction
tension
Answer: D: Tension
Explanation:
The second paragraph of the article discusses how scientists monitored a crack in a rock face on a cliff. How did their findings help them assess the risk of falling rock?
Answer:
The scientists discovered that the crack expanded and contracted about 1 centimeter each day based on daily changes in temperature. They also discovered that the overall gap in the rock widened over the span of several summers and weakened the rock. The instability of this weakened rock might increase the risk of rock falls.
Explanation:
Same exact answer you might just want to change it up a little bit or copy and paste your welcome ! :) <3
RE-WRITTEN ANSWER: They recorded and looked at the amount the gap in the rocks expanded and reverted each day by 1 centimeter based on the differences in temperatures. The gap in the rock expanded greatly over the course of multiple summers and damaged the rock.
EXACT PLATO ANSWER: The scientists discovered that the crack expanded and contracted about 1 centimeter each day based on daily changes in temperature. They also discovered that the overall gap in the rock widened over the span of several summers and weakened the rock. The instability of this weakened rock might increase the risk of rock falls.
What difficulties would arise due to lack of uniformity in measurement in different
countries? Write in brief.
Answer:
Many difficulties would arise if there was a lack of uniformity in the measurement of various weights and measures between business, industry, individuals and countries.
The biggest implications for a lack of uniformity are in health and safety, equity and sustainability.
Explanation:
https://alessandrorossini.org/we-can-put-an-end-to-imperial-units/
physical sciences Practical test
so ummmm what about ?
because I cant see any actual question?
5. How is the person in the photos separating the
charges in her hair and the balloon?
Explanation:
when a Rubber Balloon is rubbed against human hair, electrons are transferred from the hair to the rubber, giving the balloon a net negative charge and leaving the hair with a net positive charge .As the balloon is pulled away,the opposite charge on the hair causes it to be attracted the balloon
A car has a kinetic energy of 432,000 J when traveling at a speed of 23 m/s. What is its mass?
Answer:
2
Explanation:
2
Calculate the distance of the end of a valley bearing in mind that the echo takes 0.7 seconds to be heard from the moment when the sound was produced.a
Answer:238m
Explanation:Distance = speed x time
Speed = 340 m/s
340 m/s x .07 s = 238m
Why should a physical quantity be measured?
Answer:
It allows us to understand nature much more deeply than does qualitative description alone.
Explanation:
Without explaining the measurements, a quantity cannot always be measured.
Hope this helped, and please mark as Brainliest :)
Why is your weight the same any place on Earth?
Answer: A person can weigh differently at various place on Earth because of the fluctuations in Earth's gravity, according to a new high-resolution map. ... Earth's gravity is weaker at the equator due to centrifugal forces produced by the planet's rotation
Explanation:
If a balloon is charged with static electricity and you rip small pieces of tissue paper. Will it stick to the balloon?
Answer:
Yes
Explanation:
Rubbing a balloon with wool cloth will create static electricity charges. If you place small pieces of tissue paper near the balloon in Picture 2, they would probably stick to the balloon.
How do the molecules at point A compare to the molecules at point B? They are farther apart. They have increased in size. They have lost energy. They are moving slower.
Answer: hello the image is missing but am able to provide you with an answer to your but I am unable to attach the image
They are moving fasterThey are farther apart They have gained energyExplanation:
Molecules at point A compared to molecules at point B shows that they are
They are moving fasterThey are farther apart They have gained energyThe movement of molecules is caused by the application of energy in various forms especially thermal energy
Answer:
The answer is A!
Explanation:
Got it right on edge 2021 :>
Could Mars be a suitable alternative to Earth as a second home for humans? Explain your answer.
Answer:
yes
Explanation:
After the Earth, Mars is the most habitable planet in our solar system due to several reasons: Its soil contains water to extract. It isn't too cold or too hot. ... Gravity on Mars is 38% that of our Earth's, which is believed by many to be sufficient for the human body to adapt to.
Radiation present in the environment but not produced by humans is called ______.
Answer:
background
Explanation:
PLEASE HELP ME I AM TIMED!
Answer:
I would say the 3rd one
Explanation:
The velocity of a particle is described by an equation v=ct +dt-2 where c=0.1m/s and d=0.02m/s Calculate
Answer:
See solution below
Explanation:
Complete question
The velocity of a particle is described by an equation v= ct + dt²
where c = 0.1 m/s and d = 0.02 m/s. Calculate:
(i) the change in velocity during the time interval t = 3 seconds and
t = 6 seconds.
(ii) the average acceleration in that same time interval
Substitute the value of c and d into the equation to have
v= ct + dt²
v = 0.1t+0.02t²
The velocity at the = 3secs will be expressed as:
V(3) = 0.1(3)+0.03(3)²
v(3) = 0.3+0.27
V(3) = 0.57m/s
When t =6secs
V(6) = 0.1(6)+0.03(6)²
v(6) = 0.6+1.08
V(6) = 1.68m/s
Change in velocity = v(6)-v(3)
Change in velocity = 1.68-0.57
Change in velocity= 1.11m/s
B) Acceleration is the rate of change in velocity
A(t) = dv/dt
A(t) = c+2dt
A(t) = 0.1+2(0.02)t
A(t) = 0.1+0.04t
If t = 3
A(3) = 0.1+0.04(3)
A(3)= 0.1+0.12
A(3) = 0.22m/s²
A(6) = 0.1+0.04(6)
A(6)= 0.1+0.24
A(6) = 0.34m/s²
Average acceleration = 0.34-0.22
Average acceleration = 0.12m/s²
Label the parts of the wave.
Answer:
A: Wavelength
B: Crest
C: Trough
D: Amplitude
Answer:
A:
✔ crest
B:
✔ amplitude
C:
✔ trough
D:
✔ wavelength
Explanation:
the molecules in a solid state have _______ energy then molecules in a gas state
Answer:
less
Explanation:
hope this helps....................:)
A high diver steps off a diving platform that is 10 meters above the water if no air resistance is present during the fall there will be a decrease in the divers what?
Answer:
Potential energy.
Explanation:
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
In this scenario, a high diver steps off a diving platform that is 10 meters above the water, if no air resistance is present during the fall there will be a decrease in the driver's potential energy. This is simply because the potential energy of all physical objects is greatly or highly dependent on acceleration due to gravity.
What provides all of the energy required to drive convection within the atmosphere and oceans?
Answer:
please give me brainlist and follow
Explanation:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents.
sound and waves plz help
Answer:
A. f = 8 Hz
B. T = 0.125 s
C. λ = 0.0166 m = 16.6 mm
D. d = 7.98 m
Explanation:
A.
The frequency of the wave can be given as:
[tex]f = \frac{n.\ of\ waves}{time}\\\\f = \frac{360}{45\ s}\\[/tex]
f = 8 Hz
B.
The time period will be:
[tex]T = \frac{1}{f}\\\\T = \frac{1}{8\ Hz}\\[/tex]
T = 0.125 s
C.
The wavelength is given as:
[tex]\lambda = \frac{c}{f}\\\\\lambda = \frac{0.133\ m/s}{8\ Hz}[/tex]
λ = 0.0166 m = 16.6 mm
D.
The distance traveled in 1 minute can be found out as follows:
[tex]c = \frac{d}{t}\\\\d = c\ t\\d = (0.133\ m/s)(60\ s)[/tex]
d = 7.98 m
A proton is moving in a circular orbit of radius 20 cm under a uniform magnetic field 0.3 t perpendicular to the velocity of the proton then the velocity of this pronto
Answer:
v = 5.75 x 10⁶ m/s
Explanation:
The radius (r) of the circular orbit taken by a charged particle is related to its speed perpendicular to a magnetic field of strength B, and is given by
r = [tex]\frac{mv}{qB}[/tex] --------------(i)
Where,
q = charge of the particle
m = mass of the particle
Making v subject of the formula in equation (i) above gives
v = [tex]\frac{qBr}{m}[/tex] -------------------(ii)
Given;
r = 20cm = 0.2m
B = 0.3T
v = unknown
q = charge of proton = 1.6 x 10⁻¹⁹ C
m = mass of the proton = 1.67 x 10⁻²⁷kg
Substitute the values of m, q, B and r into equation (ii) above to get;
v = [tex]\frac{1.6 * 10^{-19} * 0.3 * 0.2} {1.67*10^{-27} }[/tex]
Solving for v gives:
v = 5.75 x 10⁶ m/s
Therefore, the velocity of the proton is 5.75 x 10⁶ m/s
Explain why filing cabinets are
designed so that only one draw
can be pulled out at a time.
Answer:
Cabinets are made to open one at a time so that there's not much of space taken up when all the drawers are open. Hope this helps.
does light have to have a medium to pass through?
Answer:
Light does not require any medium to travel because light is a transverse wave
hope it helps
A DC generator is the same as a(n)
A. electric motor.
B. AC generator.
C. armature.
D. electric current.
Answer:
A DC generator is the same as a(n)
C. armature
what type of wave travels through matter only??
A mechanical wave can only travel through matter.
4 A car horn has a frequency of 400 Hz. The car is moving away from an
intersection at 8 m/s. The frequency heard by a woman standing at the
intersection could be
Answer:
f = 409.6 Hz, the woman hears a higher frequency sound
Explanation:
This is a Doppler effect problem, which is described by the equation for the case of a fixed observer
f = fo [tex]\frac{v}{v \pm v_s}[/tex]
where the negative sign is for the source approaching the observer
in this case the car is the one that emits the sound and moves away from the intersection
let's calculate
f = 400 [tex]\frac{343}{343-8}[/tex]
f = 409.6 Hz
therefore the woman hears a higher frequency sound
A wave oscillates with a period of 4.25 X 10-10 s. How many waves will strike a signal detector in 3 seconds?
Answer:
[tex]n=7.05\times 10^9[/tex] waves
Explanation:
Given that,
A wave oscillates with a period of [tex]4.25\times 10^{-10}\ s[/tex]
We need to find the number of waves that will strike a signal detector in 3 seconds.
We know that,
Frequency = (no. of oscillations)/time
Time period = time/(no. of oscillations)
Let there are n waves that will strike
So,
[tex]n=\dfrac{3}{4.25\times 10^{-10}}\\\\=7.05\times 10^9[/tex]
Hence, [tex]7.05\times 10^9[/tex] waves will strike in 3 seconds.
In the nucleus ______________
tell cells what to do and how to change.
Answer:
i believe it is dna
Explanation:
if i remember correctly if the dna tells the cell what to do and how to do it
PLEASE HELP!! WILL MARK THE BRAINLIEST! HIGH SCHOOL PHYSICAL SCIENCE
Using what you know about the periodic table, list some patterns that organize the elements in terms of atomic number, atomic mass and valence electrons? What do the periods (horizontal rows) and groups (vertical columns) of the periodic table indicate to us about the elements that are categorized within them?
Answer:
Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.
Explanation:
e see that starting at period 2 Li has a +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.