Okay here initially child walks on the outer edge of the disc and then started to move inside
So here as the child and Merry go round is an isolated system so there is no external Torque on this system from outside
As here we can see there is external force acting on this system by the hinge of the Merry go round as well as due to gravity so we can not use momentum conservation to solve such type of questions.
But as we can say that there is no external torque on this system about the hinge point so we will use conservation of angular momentum for this system
Here as we know that
[tex]\tau = \frac{dL}{dt}[/tex]
where L = angular momentum
since here torque is ZERO
[tex]0 = \frac{dL}{dt}[/tex]
L = constant
so here we can write initial angular momentum of the system as
[tex]L = (I_1 + I_2)*\omega[/tex]
here we know that
[tex]I_1 [/tex] = moment of inertia of merry go round
[tex]I_2 [/tex] = moment of inertia of child
so here we can say
[tex](I_1 + I_2)* \omega_1 = (I_1 + I_2')\omega_2[/tex]
so here as the child moves from edge to inside the disc it moment of inertia will decrease because as we know that moment of inertia of child is given as
[tex]I_2 = mr^2[/tex]
here m = mass of child
r = distance of child from center
Since child is moving inside so his distance from center is decreasing
so here moment of inertia of child is decreasing as he starts moving inside
so final angular speed of merry go round will increase as child go inside
[tex]\omega_2 = \frac{(I_1 + I_2)*\omega}{(I_1 + I_2')}[/tex]
so here as
[tex]I_2' < I_2[/tex]
final angular speed will be more than initial speed as child moves inside
Mike and Joe are brothers who often argue about whom is the strongest. While moving a refrigerator, Mike and Joe decide to push against opposite sides of it to see which direction it will move. They begin pushing as hard as they can. Soon, the refrigerator begins to move slowly to the right. Which of the follow statements is true?
A- mike and joe preformed the same amount of work
B- only mike preformed work
C- only joe preformed work
D- neither mike nor joe preformed any work
Both of the brothers performed work. The one who pushed with a greater force did more work, and it had a positive sign. The one who pushed with a smaller force did less work, and it was also technically "negative" work, because the motion of the fridge was in the direction opposite to his force.
Now that THAT's settled, they ought to quit fridging around, and get that thing moved like their father asked them to do.
A 2kg Book is sitting on a table.a 10n Force is pulling to the right.a 3n Force is pulling to the left what is the net force acting on the book?
Name three types of energy associated with the microwave.
I'm assuming that you're referring to a microwave oven in the kitchen.
-- electrical energy, which it takes from the wall outlet and uses to do its job
-- radio waves, in the form of microwaves at 2.45 GHz, with which it fills the chamber in which the cold meatloaf is placed to warm
-- heat (thermal) energy, which develops inside the food, when meatloaf molecules resonate with the 2.45 GHz microwaves
-- BONUS: visible light energy, if there's a little light bulb inside to let you see the meatloaf as it warms up
genes can be turned on or turned off not all genes are active at one time true or false
The answer for your question is true
Answer: True
Explanation:
Genes can be turned off and turned on based on the body function. The switching on and off of genes is a continuous process which takes place life long.
This turning off and on of genes is known as gene regulation which is responsible when the genes will be on and when the genes will be off.
The DNA in same it is the functional gene which makes the cell different. Hence, the given statement is True.
What is one advantage the Hyperloop would have over other types of transportation?
Answer:
The advantage of Hyperloop is that it is a high-speed transport that does not pollute nature because it does not use fossil fuels.
Explanation:
Basically, Hyperloop is a transport system that works in a kind of aluminum capsule that circulates inside pneumatic tubes and can reach the 1,200 km / h mark. To better illustrate the idea, think of the cartoon "The Jetsons", where the characters used vacuum tubes to move around buildings. It is more or less that, only on a much larger scale: the initial idea is to take a trip from San Francisco to Los Angeles in about half an hour.
In addition to the high speed, the system is supplied with renewable energy and is still capable of generating a surplus of solar, wind and kinetic energy that can be sold to the public network, for example, to make the service more profitable. In short, Hyperloop will allow long distance travel to be made faster, safer, cheaper, immune to the climate and more sustainable than airplanes, cars or trains.
An eagle carry a trout flies above a lake along a horizontal path. The eagle drops the trout from a height of 6.1m. The fish travels7.9 m horizontally before hitting the water. What is the velocity of the eagle?
Answer:
Velocity of the eagle = 7.08 m/s
Explanation:
We have equation of motion , [tex]s= ut+\frac{1}{2} at^2[/tex], s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
Vertical motion of fish:
Initial velocity = 0 m/s , acceleration = acceleration due to gravity = [tex]9.8m/s^2[/tex], displacement = 6.1 m we need to find time.
[tex]6.1= 0*t+\frac{1}{2} *9.8*t^2\\ \\ 4.9t^2=6.1\\ \\ t=1.116 seconds[/tex]
Horizontal motion of fish:
Acceleration = acceleration due to gravity = [tex]0m/s^2[/tex], displacement = 7.9 m , time = 1.116 seconds we need to find Initial velocity (u).
[tex]7.9= u*1.116+\frac{1}{2} *0*1.116^2\\ \\ u=7.08m/s[/tex]
So, velocity of the eagle = 7.08 m/s
Answer:
7.1
Explanation:
did endgenuity, said it's correct
(explanation above is correct, also)
a boy throw a ball upward from the top of a cliff 73m high.Calculate the time in which ball will fall on the ground and the velocity of ball at that time
The ball rises for v/g seconds; which equals 14.7/9.8=1.5 seconds . After this time, it’s height will be:
h(t)=g/2(1.5)²+14.7(1.5)
=-4.9 x 2.25 + 22.05
=11.025m
The ball then falls for 49+11.025=60.025m, which takes:
g/2t²=60.025
t²=12.25
t=3.5 secs
Total time: 1.5+3.5=5 seconds
SCIENCE NEWTONS LAWS 20 POINTS FOR ANSWERING PLZZZ
how are newtons second and third laws of motion important to your everyday life?
Hello!
To answer this question we need to understand what Newton's Second and Third Laws of Motion are!
Second Law- States the accerlation of an object is dependent on two variables, the net force acting upon the object and the mass of the object.
Third Law- States that for ever action, there is an eual and opposite reaction.
The second law is important to our everyday life, because when you try to push something, it's easier for us to push it with a lighter mass. For example pushing an empty box is easier than pushing a full one. Same principal goes for a lot things in our daily life.
The third law is important to our everyday life, because action-reaction pairs affect everything in our life. One of the best examples of this can be see in human body movements!
Hope this helps you with your question.
Which of theses substances would be a poor conductor of electricity
Answer:
B. Water and sugar.
Explanation:
In the given options water and sugar would be the poor conductor of electricity. Other given options such as water and salt, water and Hcl and water and NaOH are better conductor of electricity because Hcl ,NaOH, salt (Nacl) can break into their ionic form whereas water and sugar will not.
Answer: B Water and Sugar
Explanation: I checked and I had the question
Please help a brother out I will give Brainliest
You may see this symbol at many public locations (including restaurants, hotels, etc.) that indicates the establishment has wireless internet available. What must the public establishment have in order for you to receive the signal on your laptop computer?
A)
A radio which can receive fm transmissions.
B)
A device to transmit the radio signals over a short distance.
C)
A large radio tower attached to the top of the establishment.
D)
Fiber optics cables that can be directly attached to your computer.
Your answer is B. Hope this helps! -John
Tangential velocity 2. Parabolic pathway 3. Projectile 4. Centripetal acceleration 5. Centripetal force a. acceleration towards the center caused by the centripetal force b. a force which keeps a body moving with a uniform speed along a circular path and is directed along the radius towards the center c. a curved path followed by projectiles d. an object projected through space, traveling in two dimensions, that accelerates vertically due to gravity e. the instantaneous velocity of a body moving in a circular path
1. Tangential velocity:
e) the instantaneous velocity of a body moving in a circular path.
2. Parabolic pathway
c. a curved path followed by projectiles
3. Projectile
d) an object projected through space, traveling in two dimensions, that accelerates vertically due to gravity.
4. Centripetal acceleration
a) acceleration towards the center caused by the centripetal force
5. Centripetal force
b) a force which keeps a body moving with a uniform speed along a circular path and is directed along the radius towards the center
what does a water wave transfer
What causes a star to shine brightly
Mimiwhatsup Answers: Deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus.
A star shines brightly due to nuclear fusion in its core, where the energy moves outward and radiates as light. Colors of stars relate to their temperature and size, and outburst events can significantly increase a star's shine. Gravitational lensing observed by telescopes can make stars appear brighter without an intrinsic change.
The cause of a star's bright shine is the nuclear fusion happening in its core. This process releases tremendous amounts of energy as the star's gravity pulls matter inward, causing the core's temperature and pressure to rise until fusion occurs. The energy produced by fusion then pushes outward, ultimately reaching the surface of the star and radiating into space as light, which we see as the star shining.
Stars shine in a variety of colors, which relate to their temperatures and sizes, where a blue star is typically hotter than a red star. However, the brightest shine of a star is observed when there are outburst events, such as a star engulfing a companion, which can greatly amplify its intrinsic brightness, like in the case of V838 Monocerotis.
Furthermore, gravitational lensing, which is observed by telescopes like Hubble, can also cause stars to appear to brighten. Though in this case, the star itself doesn't change intrinsic brightness, but rather the path of its light is altered to make it appear brighter from our perspective.
Help please ???? I don’t get it
As density =mass/volume
Mass is measured in kilogram & volume measured in m^ 3
So the correct statements are given
Density is derived unit of measurement.
Density is ratio of mass to volume
Density is physical property of object.
If gold costs 300$ how any millimeters on aside does a 10,000$ cube of gold measure?
Answer:
Side of cube = 24 mm
Explanation:
Usually gold price is represented for 8 g of gold = 300$
Density of gold = 19.32 [tex]g/cm^3[/tex]
Mass of gold for 10000$ = (10000/300)*8 = 266.67 g
We have density = Mass/ Volume
So volume = Mass/density = 266.67/19.32 = 13.80 [tex]cm^3[/tex] = 138000 [tex]mm^3[/tex]
Volume of cube of gold = [tex]a^3[/tex], where a is the side of cube,
So side of cube , a = [tex]\sqrt[3]{138000} =23.99 mm = 24 mm[/tex]
How many neutrons does element x have if it's atomic number is 27 and it's mass number is 74
Atomic number=Proton count
Atomic mass=Proton count+ neutron count
Neuton Count=Atomic mass-Proton count
Proton count=Atomic number=27
Mass number=74
Neuton count= 74-27=47
Which sentence best describes the runner whose velocity-time graph is shown?
' C ' is the correct description of the graph.
Calculate the pressure exerted on the heel of a boy’s foot if the boy weighs 80 N and he lands on one heel,which has an area of 16 cm2.
Pressure at a given surface is given as ratio of normal force and area
so here force due to heel of the shoes is given as 80 N
and the area of the heel is given as 16 cm^2
so we can say
[tex] P = \frac{F}{A}[/tex]
here we have
F = 80 N
[tex]A = 16 cm^2 = 16 * 10^{-4} m^2[/tex]
[tex]P = \frac{80}{16 * 10^{-4}}[/tex]
[tex]P = 5 * 10^4 N/m^2[/tex]
so pressure at the surface due to its heel will be 5 * 10^4 N/m^2
Final answer:
The pressure exerted on the heel of the boy's foot is 5 N/cm².
Explanation:
To calculate the pressure exerted on the heel of the boy's foot, we can use the formula: Pressure = Force / Area. In this case, the force is the weight of the boy, which is 80 N. The area of the heel is given as 16 cm². Now we can plug these values into the formula:
Pressure = 80 N / 16 cm² = 5 N/cm².
Therefore, the pressure exerted on the heel of the boy's foot is 5 N/cm².
Which activity is the best example of cardiovascular and strength training exercises work together
it got to be jumping jacks that all i got
Answer:
Construction tasks.Explanation:
A common activities where cardiovascular and strength training are together is during Construction tasks. In this context, aerobic and anaerobic exercises are present.
If 2 objects have the same momentum which statement is true
A: They both have the same velocity
B: The product mass X velocity is the same for both
C: They both have the same mass
D: Mass and velocity are the same for both
The correct answer is B
Answer:
correct answer is option B(The product mass X velocity is the same for both)
Explanation:
Momentum:
momentum of a body is defined as the product of mass and velocity with which body is moving.
Momentum of a body of mass m and which is moving with velocity v is given as
[tex]p=m\times v[/tex]
if two bodies have same momentum it means the product of mass and velocity is same for both.
If two bodies have dfferent masses and if they are moving with different velocities then also they may have same momentum.
for example,
first body has mass 4kg and it is moving with 10m/s velocity
then its momentum is [tex]p_{1} =4kg\times 10ms^{-1}[/tex]
[tex]p_{1} =40kgms^{-1}[/tex]
similarly if second body has mass 2kg and if it is moving with 20m/s velocity
then its momentum is [tex]p_{2} =2kg\times 20ms^{-1}[/tex]
[tex]p_{2} =40kgms^{-1}[/tex]
When a gas is cooled, the particles begin to move more______(Quickly/slowly). When the temperature drops below the____ (melting point/boiling point), the substance's particles have condensed and formed a liquid. If the liquid is cooled down even more, the amount of thermal energy in the particles will____(increase/decrease), and the liquid's temperature will continue to decrease. Eventually, the substance will freeze and form a solid. If the temperature continues to
(Increase/decrease), the particles in the solid will____ (Vibrate in place/move around one another) more slowly.
The kinetic energy of the particles is directly proportional to the thermal energy of the system. The correct options are Boiling Point; Decrease; Decrease; Vibrate in place respectively.
Thermal energy and Particles:The kinetic energy of the particles is directly proportional to the thermal energy of the system.So when thermal energy is increased the kinetic energy of the particles is also increased.Boiling Point: It is the temperature where the vapor pressure of the liquid is equal to the surrounding atmospheric pressure.Since the particles of solid-state are bonded by a strong bond hence they vibrate in place when thermal energy is increased.Therefore, the correct options are Boiling Point; Decrease; Decrease; Vibrate in place respectively.
Learn more about Thermal energy:
https://brainly.com/question/4192581
What causes the water in the blue currents to sink?
Answer:
The difference of densities is what cause the sinking of the cold water.Explanation:
The ocean encloses a certain water activity, creating the Global Conveyor Belt, which is about the thermohaline circulation, which is a system of currents.
The Global Conveyor Belt is crucial to maintain nutrients and carbon dioxide cycles. There we have warm water and cold water, each contain different percentage of salt and other minerals. Basically, the cold water tend to sink under the warm water which has more salt and more ability to absorb heat. This sinking of the cold water is due to the difference of densities, warm water is less dense that cold water, and according to physics, less dense fluids float over denser fluids.
So, basically the difference of densities is what cause the sinking of the cold water.
A student says that a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. What would you say to them?
Pls can someone help me pls!
It’s so important
Yes you are right but sometimes just because a number is bigger doesnt always make it so.
When converted to the same units, 50 m/s is equivalent to 180 km/h, which is faster than 140 km/h.
To compare the speed of 50 m/s with 140 km/h, we need to convert them into the same units. We know that 1 m/s is equivalent to 3.6 km/h. Therefore, 50 m/s is equal to 50 imes 3.6 km/h, which is 180 km/h.
Comparing this with 140 km/h, we can see that 50 m/s (180 km/h) is indeed faster than 140 km/h.
How do I calculate average velocity
Average velocity has two parts: Its magnitude (size) and its direction.
Its magnitude is
(straight-line distance between start-point and end-point, regardless of the route that's actually followed from start to finish) divided by (time taken to travel from start to finish).
Its direction is
(direction from start-point to end-point)
Notice that straight from this definition, the average velocity of going around a full circle is zero, no matter how fast you traveled. That's because the size of the average velocity is calculated from the straight-line distance from start-point to end-point, and that's zero if you finish at the same point you started from.
Can someone please help me with this question? ASAP thank you!
waters falling. it gets u stuck inside
wind blowing. makes u feel freezing
hope this helped
A stuntwoman is going to attempt a jump across a canyon that is 77 m wide. The ramp on the far side of the canyon is 25 m lower than the ramp from which she will leave. The takeoff ramp is built with a 15º angle from horizontal. If the stuntwoman leaves the ramp with a velocity of 28 m/s, will she make the jump? Why?
Answer:
She will make the jump.
Explanation:
We have equation of motion , [tex]s= ut+\frac{1}{2} at^2[/tex], s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
First we will consider horizontal motion of stunt women
Displacement = 77 m, Initial velocity = 28 cos 15 = 27.05 m/s, acceleration = 0
Substituting
[tex]77= 27.05t+\frac{1}{2} *0*t^2\\ \\ t=77/27.05=2.85 seconds[/tex]
So she will cover 77 m in 2.85 seconds
Now considering vertical motion, up direction as positive
Initial velocity = 28 sin 15 = 7.25 m/s, acceleration =acceleration due to gravity = -9.8 [tex]m/s^2[/tex], time = 2.85
Substituting
[tex]s=7.25*2.85-\frac{1}{2}*9.8*2.85^2=20.69-39.80 =-10.11 m[/tex]
So at time 2.85 stunt women is 10.11 m below from starting position, far side is 25 m lower. So she will be at higher position.
So she will make the jump.
Explain why nuclear fission and nuclear fusion release large amounts of energy.
Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
(On edge) Sample Response: In nuclear fission, the mass of the original nucleus is greater than the mass of the products. The extra mass is converted to energy. In nuclear fusion, the total binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus. Extra energy is released during the reaction.
study the motion map shown. what do the circled vectors represent?
a. velocity
b. speed
c. positive acceleration
d. negative acceleration
Answer:
It's option d - Negative acceleration
Explanation:
Let's start by demonstrate why it's not option b - Speed : Speed is a scalar quantity so it can not be represented by a vectorLet's check that the green vectors represent velocity (velocity is a vector quantity, velocity is a direction aware, while speed is just a scalar)Now let's show that the circled vectors are acceleration vectors:Mathematically position X , velocity V and acceleration A are:
[tex] \frac{dX}{dt} = V [/tex] and [tex] \frac{dV}{dt} = A [/tex]
Where X, V, A are vectors and [tex] \frac{d(a)}{dt} = b [/tex] indicates the derivate a of a time is equal to b.
So, this show that acceleration is a rate respect of time of velocity ⇒ When acceleration is positive, velocity increments, when acceleration is negative, velocity decrements.
The above explanation correspond to the motion map shown, getting demonstrated that the answer is D - Negative acceleration
The answer is:
AccelerationI need Science Experiment ideas! I am in 8th grade and I have to do a Science experiment on whatever I want but I can’t think of anything
if a block is in equilibrium the magnitude of the block's acceleration is
Answer:
zero.
Explanation:
The condition for an object to be in equilibrium is that there is no resulting force acting on it, in other words, that the force on the object is zero:
[tex]F=0[/tex]
and by Newton's second law we know that
[tex]F=ma[/tex]
where [tex]m[/tex] is the mass of the object, and [tex]a[/tex] its acceleration.
So combining the two things:
[tex]F=ma=0[/tex]
⇒[tex]ma=0[/tex], This equation is fulfilled when [tex]a=0[/tex]
Wich tells us that for the the block to be in equilibrium, the acceleration must be zero:
[tex]a=0[/tex]
If a block is in equilibrium the magnitude of the block's acceleration is 0m/s²
According to Newton's second law, the force acting on a body is equal to the product of its mass and acceleration.
Mathematically F = ma where:
m is the mass of the object
a is the acceleration of the object
If a block is in equilibrium, the magnitude of the force acting on the block will be 0, that is F = 0
Substituting F = 0 into the formula above to calculate the acceleration;
F = ma
0 = ma
Swap sides
ma = 0
a =0/m
a = 0m/s²
This shows that if a block is in equilibrium the magnitude of the block's acceleration is 0m/s²
Learn more here: https://brainly.com/question/17811936