I only need 25. What is the skiers kinetic energy at point B? Hint mechanical energy equals potential energy plus kinetic energy
Difference in height = 10 - 5 = 5 meters
Kinetic energy = Energy ( 500 N) x height (5 m) = 2,500 N/m = 2,500 joules
Answer: 2,500 joules
There are 100 steps to get from the ground-floor of a building to its rooftop. Person A walks up to the roof in 100 steps, while person B climbs up, skipping every other step. It takes person A two minutes to reach the top, while person B does it in half the time. From the information provided one can deduce that: __________
a. Both A and B perform the same amount of work, but A delivers more power output than B.
b. Both A and B perform the same amount of work, but delivers more power output than A.
c. A perform more work because he has to walk twice as many steps.
d. B performed less work because it takes him a shorter time to make the climb.
e. B performed less work becuase he only has to work half time
Answer:
C is the correct answer of this question.
PLS HELP HELP I DONT WANT TO FAIL
An airplane accelerates down a 1000-m stretch of runway at +5m/s^2. How fast is it moving at the end of this stretch of runway?
Apply thrid equation of kinematics
[tex]\\ \tt\longmapsto v^2=u^2+2as[/tex]
[tex]\\ \tt\longmapsto v^2=2(5)(1000)[/tex]
[tex]\\ \tt\longmapsto v^2=10000[/tex]
[tex]\\ \tt\longmapsto v=100m/s[/tex]
Elena Walks at a speed of 1.4m s^-1How long will it take her to travel 500mhow far will she travel if she walks for 2 hours? give your answer in units of km.
[tex]\bold{\huge{\pink{\underline{ Solution }}}}[/tex]
Given :-Elena walks at a speed of 1.4m/sTo Find :-We have to find the time taken by Elena to cover a distance of 500 mAnd, The distance covered by Elena in 2 hoursConcept Used :-
Here, we will use the concept of speed, distance and time
Speed is the distance per unit time Distance is measurement of length between two or more point of reference Time is the distance by speed Let's Begin :-We have given two conditions here
How long it will take Elena to cover distance of 500 mHow far she travels if she walks for 2 hours Condition 1 :-We know that,
[tex]\bold{\pink{ Speed = }}{\bold{\pink{\dfrac{ Distance }{Time}}}}[/tex]
Speed = 1.4m/sDistance = 500 mSubsitute the required values in the above formula :-
[tex]\sf{1.4 = }{\sf{\dfrac{ 500 }{t}}}[/tex]
[tex]\sf{ t = }{\sf{\dfrac{ 500 }{1 .4}}}[/tex]
[tex]\sf{ t = }{\sf{\dfrac{ 500 }{1.4}}}[/tex]
[tex]\bold{\boxed{\red{ t = 357.14 \:sec }}}[/tex]
Hence, Time taken by Elena to cover distance of 500 m is 357.14 sec
Condition 2 :-We know that,
[tex]\bold{\pink{ Speed = }}{\bold{\pink{\dfrac{ Distance }{Time}}}}[/tex]
Speed = 1.4m/s or 5.04km/h[ Speed = 1.4 * 60 × 60/1000
Speed = 1.4 × 18/5 = 5.04 km/h }
Time = 2 hoursSubsitute the required values in the above formula :-
[tex]\sf{ 5.04 = }{\sf{\dfrac{ S(Distance)}{2}}}[/tex]
[tex]\sf{ S = 5.04 }{\sf{\times{ 2}}}[/tex]
[tex]\bold{\tt{\boxed{\red{ S = 10.08 km }}}}[/tex]
Hence, The distance covered by Elena in 2 hours is 10.08 km.
The energy of random atomic and molecular motion is called.
The Magnetic Field in a current carrying wire comes due to flow of electricity . But does the field generate or comes in simulataniously with the flow. if simulataniously then how?
Answer:
Electric current produces a magnetic field. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. ... Magnetic Field Generated by Current: (a) Compasses placed near a long straight current-carrying wire indicate that field lines form circular loops centered on the wire.
Explanation:
[tex]\large \bf\gray\dagger\pink{\frak{Solution}\curvearrowright}[/tex]
The feild never generates magnetic field on it's on. It simulataniously because when the flow of current stops , it loses it's magnetism and then there will no magnetism thus no magnetic feild.
5. How many years does the first 10 yards represent? What events are within the first 10 yards of the football field from the TODAY end zone? Explain what this means in terms of expansion of life on Earth.
Based on the length of a football field and the timeline of earth's history, the first 10 yards represents 460 million years.
Beginning from 460 million years ago, there was massive explosion and expansion of life on earth.
What is a timeline of earth's history?A timeline of earth's history shows the events that occurred from the beginning when earth was formed 4.6 billion years ago until today.
In this activity, a football field is used to represent the timeline of earth's history.
Each end of the football field represents the two end zones, Earth's beginning and TODAY end zone.
A football field is 100 yards long.The earth is 4,600,000,000 years old.Each yard equals 46,000,000 yearsThus, the first 10 yards equals = 46,000,000 × 10 The The first 10 yards = 460,000,000 years.
From the TODAY end zone, the the first 10 yards = 460,000,000 years.
460,000,000 years ago marked the time from the appearance of the first plants until humans and all life on earth as it is today.
This, meant that within this period, there was massive explosion and expansion of life on earth.
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The diagram below shows a boat moving north in a river at 3m/s while the current in the river moves south at 1 m/s.
How will the boat be affected if it enters a part of the river where the current is moving south at 4 m/s?
Answer it will move slower:
Explanation: cause the force that’s opposite of it
Which of the following statements is NOT true about good communication? A. Good communication makes it difficult to express wants and needs. B. Good communication helps prevent misunderstandings. C. Good communication allows for expression. D. Good communication builds healthy relationships. Please select the best answer from the choices provided. A B C D.
Communication is the act of conveying information from one person to another. .'Good communication makes it difficult to express wants and needs.'These statement is not true about good communication.
What is communication?Communication is the act of conveying information from one location, person, or organization to another. There is a sender, a message, and a recipient for every message.
Communication, while it may appear to be a simple notion, is actually a very complex topic. The message's path from sender to the destination might be influenced by a multitude of circumstances.
Hence the option 'A' is right. 'Good communication makes it difficult to express wants and needs this statement is not true about good communication.
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the answer is A
Explanation : took the quiz on edge 2020
1. What part (or parts) of this system store potential energy?
2. What part (or parts) of this system use kinetic energy?
Answer:
➢when you crank you make kinetic energy and then the kinetic energy makes potential energy.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
[tex]kai6417[/tex]
#carry on learning
A mass on a spring is first placed on a table and set in SHM and then held vertically and set in SHM. What variable/s would change between the two scenarios?
The variable that changes is the period of the motion.
What is simple harmonic motion?The term simple harmonic motion refers to a regular repeating motion. The acceleration of the SHM is always directed towards the center. The spring is an example of a system undergoing simple harmonic motion.
From the description in the question, the variable that changes is the period of the motion.
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Help please :((((
Four movers pushed different boxes across a floor for the same distance. The table shows how much force each mover used, the time it took to move the box, and the mass of the
box.
Force Time. Mass of box
Akira: 155 5 15
Maddie: 120 10 15
Jayden: 90 3 18
Hamid: 160 10 22
Please help!!! I really need to pass this class!
Answer:
Hamid
Explanation:
I got it right on my test
I have a physics mid year exam tomorrow and I'm already so late with my studies AND it's 10:30pm should I study each chapter or just start answering questions and correcting?
Answer:
Depends
Explanation:
If you understand the content rush through questions. If you dont understand learn the key concepts of all the chapters then on the commute tomorrow test your self on the concepts. Good luck!
A 2.0 mass has j of kinetic energy
What is the speed?
Answer:
v= 4.8 m/s
Explanation:
m= 2.0
KE= 1/2 mv^2
v= ?
v= 1/2 (2.0)^2
v= 4.8 m/s
Which plant tissue makes up the thinnest layer?
Answer: Epidermis tissue.
Explanation: Layer of cells covering surface of entire plant, what it does is Acts as a barrier to fungi and other microorganisms and pathogens. the thin layer because it Allow for light to pass through, thereby allowing for photosynthesis in the tissues below
The energy of an electromagnetic wave is related to its amplitude.
Answer:
True
Explanation:
The energy carried by a wave is proportional to its amplitude squared. The larger the strength of the electric and magnetic fields, the more work they can do and the greater the energy the electromagnetic wave carries. A wave's energy is proportional to its amplitude squared (E2 or B2).
What simple machine would you use to chop down a tree?
Explanation:
i will use chainsaw to cut a tree and even if that doesn't work I will use axe to make my work easy.
hope this helps you
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A proton is accelerated to one-tenth the velocity of light, and this velocity can be measured with a precision of 1%. What is the uncertainty in the position of this proton
The uncertainty in the position of the proton is 1.1 x 10⁻¹³ m.
Velocity of the protonThe velocity of the proton is calculated as follows;
[tex]v = \frac{1}{10} \times 3\times 10^8 \ m/s = 3 \times 10^7 \ m/s[/tex]
precision of the velocity, Δv = 0.01 x 3 x 10⁷ = 3 x 10⁵ m/s
Uncertainty in the position of the protonThe uncertainty in the position of the proton is calculated as follows;
[tex]\Delta xm\Delta v= \frac{h}{4\pi} \\\\\Delta x = \frac{h}{4\pi m\Delta v} \\\\\Delta x = \frac{6.67 \times 10^{-34} }{4\pi \times 1.67 \times 10^{-27} \times 3\times 10^5} \\\\\Delta x = 1.1 \times 10^{-13} \ m[/tex]
Thus, the uncertainty in the position of the proton is 1.1 x 10⁻¹³ m.
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A simple string light produces 10 J of light energy each second. What is
the efficiency of the light bulb if it uses up 200 J each second? Show work
A. 5%
B. 10%
C. 20%
D. 25%
Worth 25 points on my exam
(will give brainliest btw)
A squirrel runs out in front of a car moving at +20m/s. The driver slams on the brakes and begins decreasing at -8m/s^2. Determine the fate of the squirrel if it was initially 26 meters from the car when braking began.
We need to verify the thrid equation of kinematics here
[tex]\\ \tt\longmapsto v^2-u^2=2as[/tex]
[tex]\\ \tt\longmapsto 20^2=2(-8)s[/tex]
[tex]\\ \tt\longmapsto 400=-16s[/tex]
[tex]\\ \tt\longmapsto s=|400/-16|[/tex]
[tex]\\ \tt\longmapsto s=25m[/tex]
The squirrel has a good luck ,Car gets stopped just 1m away from the squirrel .
Explanation:
According to the Question
A squirrel runs out in front of a car moving at +20m/s ( initial speed u) . The driver slams on the brakes and begins decreasing at -8m/s² ( here the acceleration is acting in opposite directions of motion a )
When Squirrel was 26 metres ( Distance from the car initially )
Using Kinematic Equation
v² = u² + 2asOn substituting the value we obtain
➥ 0² = 20² + 2 × -8 × s
➥ 0 = 400 - 16 × s
➥ -400 = -16 × s
➥ 400/16 = s
➥ 25 = s
So, the squirrel is 25 metres from the car .
WHICH ONE IS CORRECT???
Answer:
A
Explanation:
Answer:
According to Pascals law, THE PRESSURE EXERTED TO A CONFINED LIQUID IS TRANSMITTED EQUALLY AND UNDIMINISHED IN ALL DIRECTIONS THROUGHOUT THE MASS OF THE LIQUID--Blaise Pascal
so the pressure at A2 must be equal to A1
buy however the F1 will be less than F2 since:
P1=F1/A1 and P2=F2/F1
P1=P2 according to Pascal
so, F1/A1=F2/A2
with less amount of force at P1 THE force gets multiplied.
Therefore it's obvious that option A and B is wrong. I can't see option C properly.
but, you are going to have this option.
C.F1>F2
so the option with F1>F2 is correct
PLEASE MARK BRAINLIEST
Se dispara un proyectil con una velocidad de 50 m/s con un Angulo de 37° respecto a la horizontal. Calcular después de que tiempo se encontrará a 25m de la superficie por segunda vez
La posición vertical del proyectil es:
y = 50 m/s sen37° - 1/2 . 10 m/s² t²; sen37° ≈ 0,6
Omito las unidades:
y = 30 t - 5 t²;
Según el enunciado es y = 25
Luego 25 = 30 t - 5 t²; o bien t² - 6 t + 5 = 0
Es una ecuación de segundo grado en t, que resuelvo directamente:
t = 1 s, t = 5 s
Pasa por primera vez en 1 s (subiendo)
Pasa por segunda vez en 5 s (bajando)
A basketball and a bowling ball are relatively the same size or volume. Explain which ball is denser and why.
Answer:
The Bowling Ball is Denser.
Explanation:
If we consider both balls in terms of mass they are very different. Size and volume can be the same though.
What makes the mass? Think of what fills each of the balls.
A Basketball is filled with air, which weighs very little.
Meanwhile, a bowling ball is filled with coverstock, made up of plastic, urethane and resin. These materials weigh considerably more than air!
Why do two electrons repel when they interact? (1 point)
O because they both have similar negative electric charge
O because they both have similar mass
o because they both form part of different atoms
o because they both are subatomic particles
Answer:
In order to minimize the potential energy, they repel each other (in the case of a positive and negative charge, potential energy is minimized by bringing them together, so they attract).
Explanation:
Hope it helps
Two electrons repel when they interact, because they both have similar negative electric charge.
What is the property of interacting charges?When the two charges or the charged bodies interact each other, the force of attraction or repulsion acts between them. This force of attraction or repulsion can be find out using the coulombs law.
According to the Coulombs law, the force of attraction of repulsion between charged two bodies is directly proportional to the product of charges of them and inversely proportional to the square of distance between them. It can be given as,
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]
Here, (k) is the coulombs constant, (q1 and q2) is the charges of two bodies and (r) is the distance between the two charges.
This force of attraction or repulsion is identified by the sign of the particular charge. According to the property of interacting charges-
Like charges-For the like charges, when two charges interact to each other, then the charges attract each other.Unlike charges-For the unlike charges, when two charges interact to each other, then the charges repel each other.As the electrons are negatively charges. Therefore, two electrons repel when they interact, because they both have similar negative electric charge.
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Which of the following is an example of a behavioral adaptation?
Answer:
b. migration
A migration can be defined as the changes that occur in the behavior, structure, physiology of the organism so as to allow it to survive in unfavorable environmental conditions. Behavioral adaptation can be defined as the changes that occur in an organism's behavior which affects it's actions and helps it to survive like choice of mating partner, calling the mates for copulation and migration to different location all are the examples of the behavioral adaptations
Explanation: Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations. Adaptations are the result of evolution. Evolution is a change in a species over long periods of time.
A kid jumping on a trampoline reaches a height of 0.925 m. What was his speed when he left the trampoline?
Answer:
4.26 m/s
Explanation:
h = 0.925
v = 0
u = ?
v = u^2 - 2gh
0 = u^2 - 2gh
u = sqrt 2gh
= sqrt 2*9.8*0.925
= 4.258
= 4.26
What term is used to describe a specific metric that often determines the success or failure of a task?.
Which statement best describes scientific theories? (2 points) Group of answer choices Scientific theories are based on facts that describe natural events. Scientific theories describe natural events but do not explain them. Scientific theories are facts based on observations of events in the natural world. Scientific theories attempt to explain how events occur in the natural world.
Answer:
Scientific theories attempt to explain how events occur in the natural world.
Answer:
The answer is option A. Scientific theories attempt to explain an entire group of related phenomena.
Explanation:
I got it right on the test
Hope it helps!
A star such as the Sun starts out as a protostar with a diameter a hundred times larger than its diameter during its main-sequence lifetime. Accordingly, the protostar's temperature is much less than its main-sequence temperature. Assume that while the Sun was a protostar it had a diameter 95.00 times that of the present-day Sun. How many times greater was the protostar's surface area
The protostar's surface area was 1.1 times greater.
Surface area of the star
The surface of the star can be assumed be circular and the surface area can determined as follows;
initial diameter = 100dfinal diameter = 95dArea = πr²
[tex]Area = \frac{\pi d^2}{4} \\\\Area = \frac{(100d)^2}{(95d)^2} \\\\[/tex]
Surface area = 1.1 times greater
Thus, the protostar's surface area was 1.1 times greater.
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A block with a mass of 55 kg is pulled with a force of 220 N. Assuming a frictionless surface, what will be the acceleration of the block?
OA
0.25 m/s2
о
B
4.0 m/s2
O.
9.8 m/s2
Oo. 22 m/s2
2022 huminate Education
PLS HELP HELO ME!!!
Answer:
B) 4 m/s²
Explanation:
Since the surface it's kept on is frictionless, the net external force acting on the block will be 220 N.Mass of the block = 55 kg[tex] \boxed{ \sf{ F= m \times a}}[/tex]
Here,
F is the net external force applied to an object,m is the mass of that object, anda is the acceleration it acquires.Substituting the respective values for F and m:
==> 220 = 55 × a
==> 220 = 55 × a
dividing the equation by 55:
==> 4 = a
Therefore, an object of 55 kg when pulled across a frictionless surface by a force of 220 N accelerates at 4 (m/s)/s