How do we find the Average Speed ?
The Average Speed is the distance traveled for the object, divided by the elapsed time taken to travel that distance, so the formula is :
S = D / T
where S = Average Speed, D = Distance, and T = Times
Here the object is the ball, the distance is 9 meters and the time elapsed for the ball to roll down the street is 3.5 seconds. Applying the formula we get :
S = 9 / 3.5 ≈ 2.6 metres per second
The ≈ symbols (which is the wavy equal sign) means we can't write the exact result, because there is an infinite quantity of numbers after the decimal point. So we need to give an approximation, since the result is 2.57142857142857...etc. we choosed to round up the result to 2.6.
(1) A man of mass 50 kg stands in a lift. Calculate the reaction of the floor of the lift on the man when the lift moves with an acceleration of 2 ms2 (a) upwards: (B) downwards. [Take g = 10.0 m 5-2 ]
Answer:
use formula a equal to v-u by t
You shake a bottle of soda and take off the cap. If the soda shoots out of the
bottle with a velocity of 17 m/s, how high will it go?
A. 16.9 m
B. 14.7 m
C. 10.6 m
D. 12.2 m
Answer: B) 14.7 meters
============================================================
Explanation:
The bottle cap is a projectile, so we'll use the aptly named projectile formula
That formula (the meters version of it anyway) is approximately
h = -4.9t^2 + v*t + s
where,
t = elapsed time in secondsh = height at time tv = starting velocitys = starting heightWe'll assume that s = 0, though realistically it's probably going to be a bit larger than this (since the person is holding it above the ground). For the sake of simplicity, we'll stick with s = 0.
We're told that the initial velocity is 17 m/s, which means v = 17.
All of that means the formula mentioned earlier updates into this:
h = -4.9t^2 + 17t
If we were to graph this, or apply the -b/(2a) formula, then you should find that the vertex occurs when t = 1.73469 approximately.
Plug this into the equation we found to get...
h = -4.9t^2 + 17t
h = -4.9(1.73469)^2 + 17(1.73469)
h = 14.7449
h = 14.7
The bottle cap will reach a peak height of approximately 14.7 meters and does so at around the 1.7 second mark. The total flight time is approximately 2*1.7 = 3.4 seconds. This all assumes that the starting height and ending height are both 0 meters off the ground.
The soda will go as high as 14.7 meters. Therefore, option (B) is correct.
What is the conservation of energy principle?We can solve this problem using the conservation of energy principle, which states that the initial energy of a system is equal to the final energy. At the start, the soda in the bottle has some potential energy due to its position and kinetic energy due to its motion. When the soda shoots out of the bottle, it converts all of its initial energy to potential energy as it reaches its maximum height.
Using the conservation of energy, we can write:
Initial energy = Final energy
[tex]0.5 * m * v^2 = m * g * h[/tex]
where m is the mass of the soda, v is its velocity, g is the acceleration due to gravity ([tex]9.8 m/s^2[/tex]), and h is the height it reaches.
Solving for h, we get:
h = [tex](v^2)/(2g) = (17^2)/(29.8)[/tex]= 14.7 m
Therefore, the soda will go as high as 14.7 meters. Option B is correct.
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I'm completely stumped as to how to do this.
I know the components of f1 are f1x= 1600, f1y=0, f2x= 433 f2y=250 and f3x= 467
Explanation:
You have already determined the components of the known forces so I won't repeat your work here. Since the resultant force [tex]\vec{\textbf{R}}[/tex] and F1 are completely along the x-axis, we can conclude that
[tex]F_{2y} = F_{3y} \Rightarrow F_{3y} = F_3\cos{\theta} = 250\:\text{lb}[/tex]
We can now solve for the magnitude of [tex]F_3:[/tex]
[tex]F_3 = \sqrt{F_{3x}^2 + F_{3y}^2} = \sqrt{(467)^2 + (250)^2}[/tex]
[tex]\:\:\:\:=529.7\:\text{lb}[/tex]
The angle [tex]\theta[/tex] is then
[tex]\tan{\theta} = \dfrac{F_{3y}}{F_{3x}} = \dfrac{250}{467}[/tex]
or
[tex]\theta = 49.2°[/tex]
Compare the movement of four cars. Car A covered a distance of 60 km in 1hr.
Car B covered a distance of 30 km in 30 minutes. Car C covered a distance of 20
km in 15 minutes, Car D covered a distance of 10 km in 7 minutes, which car had
the highest velocity?"
Answer:
car D
Explanation:
1) before to compare all the values of the velocities, they must be in the same units of measurement. It means:
for car A: V=60km / 1h=60km/h;
for car B: V=30km / 0.5h=60km/h;
for car C: V=20km / 0.25h=80km/h;
for car D: V=10km / (7/60)h≈85.7km/h.
2) according to the values calculated in item 1 the car D had the highest velocity.
Answer:
Below
Explanation:
We can use this formula to find the velocity of an object
velocity = displacement / change in time
*note I converted all distances to meters and all times to seconds, its not necessary though**
CarAvelocity = 60,000 m / 3600 sec
= 16.66667 m/s
CarBvelocity = 30,000 m / 1800 sec
= 16.66667 m/s
CarCvelocity = 20,000 m / 900 sec
= 22.2222 m/s
CarDvelocity = 10,000 m / 420 sec
= 23.80952 m/s
Therefor, car D has the highest velocity
Hope this helps!
If a car goes down Lake at 30 miles per hour how far will it go in 0.25 hours?
Answer:
7.5 miles
Explanation:
0.25 hours=15minutes.
So you do
30 miles=60minutes
x =15minutes
cross multiply
Ans-7.5
by what factors does the speed of the elctron exceed that of the proton?
Answer:
» An electron is lighter than a proton.
explanation:
[tex]{ = \: \sf{an \: electron \: has \: formula \: \: }}{ \bf{ {}^{0}_{ - 1}e }}[/tex]
hence it's mass number is zero
[tex]{ = \: \sf{an \: electron \: is \: helium \: particle \: \: }}{ \bf{ {}^{4} _{2}He }}[/tex]
hence it's mass number is 4
Therefore, proton is heavier than electron
» An electron has a small charge magnitude than a proton.
Explanation:
An electron has charge of -1 while proton has charge of +2, therefore electron is less deflected by any energetic fields than a proton
Define limitations in an experiment
Answer:
The limitations of the experiment are those characteristics of design or methodology that impacted or influenced the application or interpretation of the results of your study.
A car is traveling at 100 km/hr. How many hours will it take to cover a distance of 750 kilometers?
What are you solving for?
What’s the equation?
Show work!
Help pleaseee!
Answer:
7 hours 30 minutes
Explanation:
Since the car will take 1 hour to cover 100 km we can conclude that it takes 7 hours to cover 700 km, and it will take half the time to cover half the remaining distance i.e. it will take 30 minutes to cover the remaining 50 kilometers.
What is the formula for the speed of an object, using distance and time? In m/s.
The answer you are looking for is S=D/T, which is the formula.
It is also read as Speed=Distance/Time, or Speed=Distance divided by Time.
The "S" stands for "Speed."
The "D" stands for "Distance."
The "T" stands for "Time."
I hope this has helped answer your question. Enjoy your day, and take care.
Answer:
The formula is S=D/T.
Explanation:
name one instrument use to determine the atmospheric pressure
Answer:
Explanation:
A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
Answer:
Barometer
Explanation:
Its units are atmospheres (atm) or bars.
How do I describe the movement of a student walking at fore say 10 M/S on a velocity time graph from 5-10s? So like starting at 5 seconds to 15 seconds the student is at 10 meters and stays there until after 15 seconds. how do i describe that? How far did the student walk? Please answer
It means The student walked for 5s with a velocity of 10m/s
Distance=Velocity(Time)
[tex]\\ \rm\longmapsto Distance=10(5)[/tex]
[tex]\\ \rm\longmapsto Distance=50m[/tex]
Answer:
[tex]\sf\longmapsto \: 50 \: metres[/tex]
Explanation:
Given,
Velocity is 10m/s
Let us find the time:
[tex]\sf\longmapsto \: 10 - 5[/tex]
[tex]\sf\longmapsto \: 5 \: seconds[/tex]
Now,We know that Distance = Velocity × Time
[tex]\sf\longmapsto \: 10 \times 5[/tex]
[tex]\sf\longmapsto \: 50 \:metres[/tex]
Two falling inflated balls of different masses
land at the same time.
Answer:
Đương nhiên quả bóng do người thổi vào thì nặng hơn quả bóng dùng bơm bơm vì:
+ Quả bóng bơm thành phần chính là oxy, còn bóng thổi thành phần chính là CO2. CO2 đương nhiên nặng hơn oxy rồi
+ Khí do người thổi chứa rất nhiều hơi nước so với không khí nên cũng nặng hơn
+ Quả bóng xẹp đương nhiện nhẹ hơn quả bóng được bơm đẩy không khí vì không khí có khối lượng mà. Tuy nhiên sự nặng hơn này rất không đáng kể. Phải có những cân siêu chính xác và độ chia nhỏ mới thấy điều này.
Explanation:
The circled one please
Mark brainliest!!
Answer:
50µs
Explanation:
The conversion is that 1 second equals 1,000,000 micro seconds. Since we have 0.00005 seconds, we will multiply that to a million.
0.00005 * 1,000,000 = 50µs
Keep in mind that 50 only has 1 significant figure because any trailing zeroes before the decimal point do NOT count.
Best of Luck!
0.00005 seconds = 50 μs
Thank you
By how many times will the kinetic energy of a body increase if its speed is tripled? Show by calculation.
Answer:
9 times more kinetic energy
Explanation:
KE₀ = ½mv²
KE₁ = ½m(3v)² = 9(½mv²) = 9KE₀
Which of the following is NOT an important phenomenon that commonly erodes and weathers exposed rock outcrops to form sedimentary material?
a) Lightning
b) Wind
c) Rain
d) Freezing/Thawing
Answer:
Explanation:
While each of these can cause erosion and weathering, lightning is probably the least important as it occurs less frequently and affects a much smaller surface area when it strikes.
Wind is not very effective by itself, but it can carry abrasives which work to degrade rock surfaces. It covers a very large area at once so the net effect can be moderate to large especially desert areas where plants are not readily available to disrupt the flow.
Rain covers huge areas and is quite common.
Freezing/Thawing cycles cover large areas and are quite common in the temperate and arctic latitudes and even in tropical altitudes.
Attached is a photo taken atop Half Dome in Yosemite National Park showing two of thousands of divots in the rock there caused by lightning strikes. The current in the lightning heats the stone causing water trapped in it to flash to steam. The increased pressure inside the stone can overwhelm the material strength and blow rock chunks over a fairly good sized area. This is a fairly rapid weathering and erosion when it occurs, but that is typically limited to a few dozen days per year and occurs mostly on high ground where lightning is more likely to strike earth.
Why is evolution called a scientific theory?
Answer:
Explanation:
Evolution is both a fact and a theory. Evolution is widely observable in laboratory and natural populations as they change over time. The fact that we need annual flu vaccines is one example of observable evolution. At the same time, evolutionary theory explains more than observations, as the succession on the fossil record. Hence, evolution is also the scientific theory that embodies biology, including all organisms and their characteristics. In this paper, we emphasize why evolution is the most important theory in biology. Evolution explains every biological detail, similar to how history explains many aspects of a current political situation. Only evolution explains the patterns observed in the fossil record. Examples include the succession in the fossil record; we cannot find the easily fossilized mammals before 300 million years ago; after the extinction of the dinosaurs, the fossil record indicates that mammals and birds radiated throughout the planet. Additionally, the fact that we are able to construct fairly consistent phylogenetic trees using distinct genetic markers in the genome is only explained by evolutionary theory. Finally, we show that the processes that drive evolution, both on short and long time scales, are observable facts.
The evolutionary theory is a scientific theory because its assumptions are well sustained by scientific data.
Scientific data refers to the body of knowledge obtained by using the scientific method.A scientific theory is a well-sustained explanation of one or more questions of the natural world, which was repeatedly tested and verified by using the scientific method.The theory of evolution by natural selection is a theory because it has been repeatedly corroborated through the scientific method.In conclusion, the evolutionary theory is a scientific theory because its assumptions are well sustained by scientific data.
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hey friends give me the solution to attachment
Answer:
downwards bro now dodododododdodo
Answer:
[tex]vertically \: downward \\ to \: the \: cenre \: of \: earth \\ thank \: you[/tex]
Which is the absolute location of St. Louis, Missouri?
38 ½° N, 90 ½° W
near the border of Missouri and Illinois
southwest of Chicago, Illinois
42° N, 100° W
Map of U S showing Iowa, Illinois, Indiana, Missouri, Kentucky, Chicago, Indianapolis, Saint Louis, forty degrees North, and ninety degrees West
Answer:
The first is the closest in absolute values.
The second two are vague and the last is approximate.
câu 1 vẽ sơ đồ trình bày nguyên lý làm việc các thông số và đặc điểm của mạch chỉnh lưu cầu 1 pha
câu 2 vẽ sơ đồ trình bày nguyên lý làm việc của bộ nghịch lưu áp 1 pha
Answer:gang gang father gang
Explanation:idek cuh
A student is making a model of the famous Giza pyramid,
which has four triangular sides and a square base. The
scale of the model is 1:1,000.
How many sides should the model pyramid have?
Answer:
The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the pyramids in the Giza pyramid complex bordering present-day Giza in Greater Cairo, Egypt.It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.
Explanation:
Who wants to do my physics work for 90?
Answer:me
Explanation:I do
A light bulb uses 40.0 W of power when connected to a 110 V (DC) outlet. If the same bulb is connected to a European 220 V outlet, how much power will the bulb use?
If the bulb's resistance doesn't change, the power it uses is proportional to the square of the voltage. So doubling the voltage quadruples the power.
On 220 V, the bulb uses (4 • 40w)= 160 W.
It glows very brightly.
For a very short time.
Because it also gets very hot, and burns out.
After a few seconds, it uses zero watts.
Answer:
160
Explanation:
Acellus
What is scintillator
Answer:
Scintillators are materials that transform high-energy radiation like X-rays or gamma-rays into visible light or near-visible light. They're commonly utilized in medical diagnostics, high-energy physics, and geophysical exploration as detectors.
Explanation:
i hope this helps
Lithium's atomic number is 3. How many electrons does a neutral lithium atom have? explain.
Answer:
It has 3 electrons
Explanation:
Neutral atom has an overall charge of zero.
Since atomic number is 3, it has 3 protons [ positive charges ]. So, to be neutral, the atom must have 3 electrons [ negative charges ] to cancel out the positive charge.
which part of vernier caliper is used to measure external diameter of cylinder?
[tex]{\huge{\pink{↬}}} \: \: {\huge{\underline{\boxed{\bf{\pink{Answer}}}}}}[/tex]
The lower jaws present in the vernier callipers is used to measure the external diameter or thickness of pencils etc...
who is george washington? what does he do for america?
George Washington was an American political leader, military general, statesman and Founding Father of the United States, who serves as the first president of the United States from 1789 to 1797.
During the American Revolution, the led the colonial forces to victory over the British and became a national hero. In 1787, he was elected president of the convention that wrote the U.D. constitution. Two years later, Washington became the America's first president.
Question 4 A car of mass 820 kg has a maximum power or 30 kW and moves against a constant resistance of motion to 910 N. Calculate the maximum speed of the car in the following situation On ground level ?
[tex]p = fv \\ v = p \div f \\ 30 \div 910 = [/tex]
Explanation:
power = force × velocity
velocity=power/force
=(30×1000)/910
=32.97m/s
The correct answer is 32.97m/s.
How to calculate the maximum speed?By using the formula:
power = force × velocity
velocity = power / force
= (30×1000)/910
= 32.97m/s
The answer is 32.97m/s.
What is maximum speed physics?
Maximum speed is the highest rate of speed an athlete can attain. Acceleration refers to velocity, and because velocity has both a magnitude and direction associated with it, acceleration changes when athletes change the magnitude of their motion (how fast they are running), the direction of their motion, or both.
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9. Which arrow or arrows indicate a process that cycles carbon from
living or nonliving organisms? Describe the process or processes
you selected. Arrow |
10. Which arrow or arrows represent reactions that demonstrate a
conservation of mass and energy? Explain your answer.
Answer:
arrow E represents cycling of carbon from living organisms to non-living organisms. this is because it is showing conversion of a carbon from the dead tree to fossil fuel.
________________________________________________________
Darkspirit :)
Visible light travels at a speed 3.0 × 108 of m/s. If red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light?
Answer:
speed /wavelength = frequency
f = 3×10*8 /6.5×10*7
f = 4.62
Um caminhão de entregas transporta produtos de tamanho e peso elevados, o que requer o uso de máquina simples para facilitar a descarga (observe a figura abaixo).
Que máquina simples é representada por essa figura?
(A) Roldanas.
(B) Alavancas.
(C) Rodas e eixos.
(D) Plano inclinado.