can someone help me ?​

The angular velocity of the skater during the finale is 2.18 rad/s.

The conservation of angular momentum is a principle in physics that states that the total angular momentum of a system remains constant if no external torques act on the system. Mathematically, this can be expressed as L1 = L2, where L1 is the initial angular momentum of a system, L2 is the final angular momentum of the system, and the total torque acting on the system is zero. This principle is analogous to the conservation of linear momentum, which states that the total linear momentum of a system remains constant if no external forces act on the system. The conservation of angular momentum is an important principle in many areas of physics, including mechanics, electromagnetism, and quantum mechanics.

We can use the conservation of angular momentum to solve this problem. The initial angular momentum of the skater and the hand-arms is given by:

L1 = I1 * w1

where I1 is the moment of inertia of the skater's body, and w1 is the initial angular velocity. Since the hand-arms are extended, their moment of inertia can be neglected.

When the skater pulls their arms inward, the moment of inertia of the system decreases. The final moment of inertia is given by:

I2 = I1 + 2md^2

where m is the mass of each hand-arm, d is the distance of the hand-arm from the axis of rotation, and we multiply by 2 since there are two hand-arms.

The final angular velocity w2 can be found by equating the initial and final angular momentum:

L1 = I1 * w1 = I2 * w2

Substituting the expressions for I1, I2, and simplifying, we get:

w2 = w1 * I1 / (I1 + 2m(d2^2 - d1^2))

where d1 is the initial distance of the hand-arm from the axis of rotation (0.60 m), and d2 is the final distance of the hand-arm from the axis of rotation (0.20 m).

Substituting the given values, we get:

w2 = 0.50 m/s * 1.719 kgm^2 / (1.719 kgm^2 + 2 * 5.0 kg * (0.20 m^2 - 0.60 m^2))

w2 = 2.18 rad/s

Therefore, The skater's angular velocity during the grand finale is 2.18 rad/s.

To learn more about momentum and  impulse equations click:

brainly.com/question/30101966

#SPJ1

Scurvy and rickets are micronutrient deficiency diseases due to a lack of certain vitamins or minerals in the diet. Scurvy is caused by vitamin C deficiency and rickets by vitamin D.

Learn more about proteins and carbohydrates, here:

https://brainly.com/question/4932822

#SPJ1

To determine the power output of the engine for a specific scenario, we need to consider the total energy of the vehicle, the rate at which frictional work is overcome, and the desired speed and acceleration.

By calculating these factors, we can determine the power output of the engine in two different situations: (a) with zero acceleration and (b) with a specified acceleration. The power output of the engine can be calculated by considering the total energy of the vehicle and the rate at which frictional work is overcome.

(a) For the scenario with zero acceleration, we need to determine the power required to overcome the gravitational potential energy and the power required to overcome the frictional resistance. The gravitational potential energy is given by the weight of the vehicle and the height gained on the incline, while the frictional work is the product of the frictional resistance and the velocity. By summing these two powers, we can find the total power output of the engine.

(b) In the scenario with an acceleration of 7 ft/sec^2, we need to consider the additional power required to overcome the increased kinetic energy due to acceleration. The additional power can be calculated by multiplying the mass of the vehicle by the acceleration and velocity. By adding this additional power to the power calculated in part (a), we can determine the total power output of the engine.

Learn more about power  here: brainly.com/question/29575208

#SPJ11

The speed of sound when a echo is heard 2.5 s later is 340 m/s.

An echo is a sound that is repeated due to the reflection of a sound wave in a medium.

To calculate the speed of light from the data supplied, we use the formula below.

Formula:

Where:

Substitute these values into equation 1

Hence, the speed of sound is 340 m/s.

Learn more about echo here: https://brainly.com/question/19579065

#SPJ1

The net force on the sled which is pulled by the tooth children is 14 Newton in the east direction.

Two children are pulling the sled in opposite direction because of the disagreement.

One of the child is pulling the sled with a force of 200 Newton in the east direction and the other is pulling the sled with the force of 175 Newton in the West direction and affection force of 10 Newton is existing between the slid and the surface.

The net force on the slide can be given by,

F = 200-150-10

F = 40N

So, the net force on the slide is 40 Newton in the east direction.

Here. we directly subtracted the force because the direction of the forces was opposite of each other and the friction also acts in the direction opposite of the motion of the object.

So, the net force on the sled is 40 Newton.

To know more about Force, visit,

https://brainly.com/question/388851

#SPJ4

The ratio of the speed of light in a vacuum to the speed of light in a transparent material is called the index of refraction

b) index of refraction

Three light-related phenomena are the subject of extensive research.

1) Rainfall's ability to disperse sunlight in the atmosphere.

2) The changing degrees of refraction of white light, which results in the construction of a rainbow arch.

3) The complete interior reflection of the raindrop. Refraction happens when light enters one medium and then exits another, producing our reaction.

Refraction, which is indicated by the light's bending or change in direction, can occur when electromagnetic energy in the form of visible light passes from one substance or medium to another.

Total internal reflection happens when light rays enter a right-angled glass prism at an angle of incidence larger than the critical angle.

Learn more about refraction here:

https://brainly.com/question/14760207

#SPJ4

Answer:

it is true

Explanation:

because the backward force you feel when your car accelerates is caused by your body's inertia

Option A is correct. The resultant quantity is 50m/s to the right.

Vector quantities are quantities that have both magnitude and direction.

From the diagram shown,  we can see that 100m/s vector moves in the positive x-direction, this means that the  of magnitude the vector is +100m/s.

For the vector 50m/s, we can see that it is moving in the negative x-direction, this shows that the magnitude of the 50m/s vector is -50m/s.

Resultant speed = +100 - 50

Resultant speed = +50m/s

Since the resultant speed is a positive value, this mean that the resultant quantity will be moving towards the right.

Hence the correct option will be 50m/s to the right.

Learn more here: https://brainly.com/question/21444366

PLCs can operate in two modes: real-time and non-real-time. The principle difference between real-time and non-real-time behaviour of PLCs is that PLC in real-time mode must execute operations as quickly and predictably as possible.Real-time PLCs have a quicker response time than non-real-time PLCs.

When a program is executed in real-time, the PLC must complete each instruction within a predetermined time frame to ensure that critical processes are completed correctly and without error in a timely manner. A real-time system's performance is measured by how quickly it can respond to a specific event or signal.

Non-real-time PLCs do not operate in this manner and execute instructions without any time restrictions or deadlines. Non-real-time PLCs are intended for applications that do not require immediate or rapid responses and where timing is not a critical factor. The system's performance isn't measured by how quickly it can react to an event or signal, but by how well it can execute a task without taking into account the time required for completion.

In conclusion, the primary distinction between real-time and non-real-time behaviour of PLCs is the responsiveness of the system. The PLCs in real-time mode respond quickly and predictably to specific events or signals, while those in non-real-time mode are intended for applications where timing is not critical and execute tasks at a pace that is not constrained by time.

To learn more about operate visit;

https://brainly.com/question/30581198

#SPJ11

Answer:

nuclear fusion

Explain: that's just my best term.

Answer:

A

Explanation:

Nuclear Fusion

The correct answer is increasing the amplitude.

Amplitude of a sound wave tells us how energetic the wave is. higher the amplitude, larger will be the energy contained in the wave. Smaller the amplitude, smaller will be the energy contained in the wave.

The loudness of sound depends on amplitude. Greater the amplitude, louder the sound will be .

Therefore, we can conclude that the loudness of sound can be changed by increasing the amplitude.

To learn more about amplitude, refer: https://brainly.com/question/9525052

#SPJ4

Answer:

the length of the cannon

the power of the gunpowder

Answer:

i would say B decrease mass of cannon or decrease mass of cannon ball

Explanation:

because when you fire the cannon the cannon ball and powder exit the cannon then that leaves the cannon ball and i would say that the explosion would force it out the cannon but would not increase its mass.

Answer:

   I = 2 A

Explanation:

Electric current is defined as the amount of face per unit of time

         I = Q / t

where Q is the charge and t is the time

let's reduce the time to the SI system

         t = 1 min (60s / 1 min) = 60 s

let's calculate

         I = 120/60

         I = 2 A

Answer: The watermelon

Explanation: The watermelon has a larger mass than the rest of the three.

Answer:

C. A baseball bat strikes a baseball.

Explanation:

Newton's second law of motion states that acceleration happens when force is applied on the mass.

A baseball bat strikes a baseball is the best example of Newton's second law of motion because acceleration of the baseball is directly proportional to the force by which baseball bat hit it.

Hence, the correct option is 'C. A baseball bat strikes a baseball.'

Answer:

Baseball bla

Explanation:

yes

Answer:

Fnet = 16.98204316 N will point right

Explanation:

q₁ and q₂ both positive ⇒ F₁₂ will point right, repel

q₂ pos and q₃ neg        ⇒ F₂₃ will point right, attract

Fnet = F₁₂ + F₂₃

Fnet = k.q₁.q₂/r₁₂² + k.q₂.q₃/r₂₃²

Fnet = 9x10⁹x 9.33x10⁻⁶x4.22x10⁻⁶/(0.18)² +  9x10⁹x 4.22x10⁻⁶x8.42x10⁻⁶/(0.23)²

Fnet = 0.3543534/(0.18)² +  0.3197916/(0.23)²

Fnet = 10.93683333 + 6.04520983

Fnet = 16.98204316 N

Answer:

Could you give information about the lab

Explanation:

Answer:

The spectrum of each astronomical object

Explanation:

I took the test and got it right

The approximate base impedance for the transmission line is 22 ohms.

To calculate the base impedance for the transmission line, we can use the formula:

Base Impedance (Zbase) = (Base Voltage)² / Base Power

Given:

Line-to-neutral base voltage = 66.5 kV (kilovolts)

3-phase power = 200 MVA (megavolt-amperes)

First, we need to convert the voltage to volts and power to watts:

Line-to-neutral base voltage = 66.5 kV = 66,500 V

3-phase power = 200 MVA = 200,000,000 VA = 200,000,000 W

Now we can calculate the base impedance:

Zbase = (66,500 V)² / 200,000,000 W

Calculating this equation:

Zbase ≈ 22 Ω (ohms)

To know more about impedance, refer:

https://brainly.com/question/32764317

#SPJ4

A lunar eclipse occurs when earth's shadow fall on moon.

To know more about eclipse visit:

https://brainly.com/question/9242798

#SPJ4

A wire's ability to elongate (or stretch) under stress is influenced by a number of variables, including the force used, the wire's cross-sectional area, and the material's elastic modulus.

The stiffness or resistance to deformation of a material is measured by the modulus of elasticity, which varies for steel and aluminium.While supporting the masses m1 and m2, let L be the length of each wire when it is not extended, and let L be the common elongation (or stretch) of the wires.

The force exerted on each wire comes from:

F = mg

where g is the gravitational acceleration. The identical amount of stretching is applied to both wires, therefore we have:

F1/A1 = F2/A2

where the cross-sectional areas of the steel and aluminium wires, respectively, are A1 and A2, respectively. A wire of diameter d has a cross-sectional area given by:

A = πd²/4

learn more about aluminium wires, here:

https://brainly.com/question/30899929

#SPJ4

WLANs are commonly found in the frequency range of 2.4 GHz and 5 GHz.

Wireless Local Area Network (WLAN) refers to a wireless computer network, typically within a building or small group of buildings.

It uses radio waves to transmit and receive data over distances of a few hundred feet to several miles and uses a router or other wireless access point to connect computers to the network.

The most common frequency ranges used by WLANS are 2.4 GHz and 5 GHz.

In which frequency range are you likely to find WLANs?.

Wireless Local Area Network (WLAN) is usually found in the frequency range of 2.4 GHz and 5 GHz.

It is a wireless computer network that works over a few hundred feet to several miles using radio waves to transmit and receive data. The connection between computers and the network is established using a router or other wireless access points.

WLANs are commonly found in the frequency range of 2.4 GHz and 5 GHz. They are wireless computer networks that use radio waves to transmit and receive data over distances of a few hundred feet to several miles.

To know more about Wireless Local Area Network  visit:

brainly.com/question/33458747

#SPJ11

The metaphor (object) that shows how Aristotle's Three Artistic Proofs hold up one's argument is a stool. The correct option is 1.

The Three Artistic Proofs are Aristotle's fundamental concepts of argument that build a convincing case when utilized together:

Ethos: It is the ethical appeal; it establishes credibility with an audience.

Pathos: This refers to the emotional appeal; it appeals to the audience's emotions and sentiments.

Logos: It is the logical appeal; it uses reasoning and logical argument to persuade and convince the audience.

The metaphor (object) that shows how Aristotle's Three Artistic Proofs hold up one's argument is a stool. A stool is a three-legged object that can stand on its own with each leg equally supporting the weight. It is like the three artistic proofs, which are required in a good argument to hold it up. Without one of the three legs, the stool would be unstable and would fall apart. This metaphor is commonly used to explain how the three artistic proofs work together to build a convincing case. Option 1.

More on Aristotle's Artistic Proofs: https://brainly.com/question/29977646

#SPJ11

Answer: D

Explanation: I have my answers VS. Go0gle answers (go0gle answers are pics)

(A) Both have the same day length. Well, Venus doesn't havve the same amount of days. (I already know off the top of my head, but I still searched it up)

(B) Both rotate in the same direction. In school (before Virus) they would always show diagrams of the planets on the projector and Venus doesn't rotate

(C) Both have ample water. No. Venus doesn't have much water >_>

(D) Both have a solid inner core and a liquid outer core. Yesh. In my lessons (before), Venus has a solid inner core and liquid outer core.

Answer:

moon

Explanation:

cause yes

Answer:

0.00025 kilometers

Explanation:

divide the length value by 1e+6

Answer:

250 mm = 0.00025 km.

Explanation:

250 mm equal 0.00025 km

Conversion details

To convert mm to km use the following formula:

1 mm equals 0.000001 km

So, to convert 250 mm to km, multiply 0.000001 by 250 i.e.,

250 mm = 0.000001 * 250 km = 0.00025 km

(hope this helps can i plz have brainlist :D hehe)

a)The primary blast cell for bone is the osteoblast b) Alveolar  is NOT a type of connective tissue. c) Connective tissue extracellular matrix is composed of fibers, and a ground substance d)Cartilage tissue tends to heal less rapidly than bone tissue. e))lines most of the respiratory tract of pseudostratified columnar epithelium containing mucus-secreting goblet cells.

In addition, blast cells known as myeloblasts can form. Young blood cells made by stem cells are what these are. The synthesis of red, white, and platelet-forming blood cells can also be hampered by an excess of blast cells. Bone marrow blasts are not expected in healthy individuals. When a person develops leukemia, aberrant, immature white blood cells—known as blasts—proliferate rapidly, filling up the bone marrow and blocking the creation of other cells vital to survival, such as red blood cells and platelets. Anemia, infections, and unusual bleeding result from this. Blast cells shouldn't make up more than 5% of the bone marrow cells in healthy individuals, and they often aren't present in the blood.

Learn  more about blast cells here:

https://brainly.com/question/8211591

#SPJ4

Answer:

T1 + T2 cos 60 = 1000 cos 15     balancing x-forces

T1 + T2 / 2 = 966         (I)

1000 sin 15 + .866 T2 = 1200    balancing y-forces

259 + .866 T2 = 1200

T2 = 941 / .866 = 1087          value for T2

T1 + 543 = 966         using equation (I)

T1 = 423