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Answer:

D. Linear momentum and angular momentum are both conserved.

When the skater jumps onto the board, he/she transfers linear momentum to the board, causing it to start moving with a velocity in the same direction as the skater. However, since the board was at rest initially, its total linear momentum changes from zero to a non-zero value. This conservation of linear momentum can be expressed as:

m(skater) x v(skater) = (m(board) + m(skater)) x v(final)

where m(skater) and v(skater) are the mass and velocity of the skater before the jump, m(board) is the mass of the board, and v(final) is the velocity of the skater and board after the jump.

At the same time, since there is no external torque acting on the board-skater system, the conservation of angular momentum can be expressed as:

I x w(initial) = (I(skater) + I(board)) x w(final)

where I is the moment of inertia of the board-skater system, w(initial) is the initial angular velocity (zero), I(skater) is the moment of inertia of the skater, I(board) is the moment of inertia of the board, and w(final) is the final angular velocity of the system.

Therefore, both linear momentum and angular momentum are conserved in this situation. The conversion of kinetic energy to angular momentum (option B) is not relevant in this case since there is no external torque acting on the system. The conservation of rotational kinetic energy (option C) is also not applicable since the system does not rotate before or after the jump.

Explanation:

Answer: 2452.5 Joules

Explanation: The equations we will be using in the problem are Weight=Mass*(Newton's Gravitational constant(9.81m/s^2)) and Work=Force*displacement*cos(the angle between the force and displacement vectors). We won't be needing the cosine part of the work equation because the work and force vectors are parallel so the angle is 0(cos(0)=1).

We are told Julie is 50 kg and she climbs 5 meters I.e. her displacement is 5 meters. We first have to calculate the force acting on Julie so that we can determine what force we will use in the work equation. Weight is a force so we can convert her 50 kg to a weight. We do this by plugging into Weight=Mass*9.81.

Weight=50kg*9.8m/s^2=490.5 Newtons.

Now we know the force that Julie is working against while climbing the stairs. She climbs 5.0m up so her total displacement is 5 meters.

Work=(490.5 N)(5 meters)= 2452.5 Joules

Hope this helps!

For extra practice, figure out how much work Julie was to do if she had been carrying her pet dog in her arms who weighed 32 Kg while climbing 5.0 meters up the stairs.

Answer:the shape

Explanation:

Answer:

To study the small changes in 6 year old child to solve problems, the appropriate method of design is microgentic.

A scientific approach known as microgenetic design, sometimes known as the microgentic method, iterative search studying the same environment to examine change in great detail.

Microgenetic designs offer a detailed examination of the behavior of the system while it is changing, in contrast to cross-sectional and longitudinal designs, which only offer broad strokes of the process of change.

The approach is applicable to any system human or otherwise whose behavior varies over time and where it may be interesting or necessary to investigate the specifics of these changes, even though it is frequently linked with developmental psychology.

This includes adult settings as well. Heinz Werner's description of a "genetic approach" in the early 20th century appears to be when the term "microgenetic" first appeared.

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The mass of the object with kinetic energy of 43200 Joules and velocity of 23 m/s will be 163.33 Kg.

Kinetic energy is the energy of an object which is present due to the state of motion of the object. Kinetic energy depends upon the mass and velocity of the object. The SI unit of Kinetic energy is meter per second square (m/s²).

KE = 1/2 mv²

where, KE is the Kinetic energy,

m is the mass of the object,

v is the velocity of the object.

KE = 43200 Joules,

v = 23 m/s

KE = 1/2 mv²

m = 2 KE/ v²

m = 2 × 43200/ 23 × 23

m = 86400/ 529

m = 163.33 kg

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Answer: so contact forces are forces that physically touch the system such as normal forces or friction and air resistance and push forces done by other objects.

Non contact forces are forces such as

gravity and electromagnetism that don’t necessarily seemed to physically touch it..

The magnitude of gravitational acceleration at the surface of a newly discovered exoplanet, having the mass to be 1.01 times the mass of Earth, and the radius of the planet to be 0.99 times the radius of Earth is 10.06 m/s².

The acceleration that an object experiences when gravity is the only force acting on it is known as gravitational acceleration.

In an empty space, all bodies accelerate at the same rate, regardless of their masses or compositions. This means that any two objects falling from the same height would always hit the ground at the same time if there was no air friction.

Depending on altitude, latitude, and longitude, this free-fall acceleration can range from 9.764 to 9.834 m/s² over the surface of the Earth. However, the accepted standard value is 9.80665 m/s². Gravity anomalies are the regions where this value dramatically varies.

According to the formula,

g = [tex]\frac{GM}{R^{2} }[/tex]

where,

g is gravitational acceleration

G is gravitational constant,

M is mass of planet and,

R is the radius of the planet.

G = 6.67 × 10⁻¹¹

M = 1.01 × 6 × 10²⁴ kg

R = 0.99 × 6.4 × 10⁶ m

substituting the values and solving for g,

g = 10.06 m/s²

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Answer:

Below

Explanation:

It travels 4.7 seconds at its

                      horizontal velocity component of  40 * cos 35  m/s

 so it travels    4.7  s    *   40 cos (35)  m/s = 154 m from start

The golf ball land from its starting point at 154 m

Define projectile motion.

When an item is launched into the air, or projected, projectile motion occurs when air resistance is minimal and gravity is the only other force acting on the object. The trajectory of the item is referred to as its trajectory, and the object is referred to as a projectile.

Projectile motion can be divided into three major categories: vertical, horizontal, and oblique. Gravity causes a vertical acceleration, which has a value of 9.8 m/s/s downward, while maintaining the projectile's horizontal velocity at a steady value.

Time is 4.7s

Velocity is 40m/s

horizontal velocity component of 40 * cos 35  m/s

The golf ball land from its starting point at :

4.7*40 cos (35) = 154 m

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Answer:

1.) Apply significantly larger forces so that deformation is more easily measured with devices like a meter stick or measuring tape.

3.) Use more precise measuring tools to detect extremely small deformations of rigid materials.

4.) Create a sample of the material that has a very large cross-sectional area so that deformations are more easily induced by a given force.

Explanation:

Answer:

in image

Explanation:

hope it helped you

The expected product would be zinc chloride (ZnCl2).

Inorganic chemical compounds having the formula ZnCl2 and its hydrates are known as zinc chloride. Nine crystalline forms of zinc chlorides are known; they are colorless or white and very soluble in water. This salt is both hygroscopic and sweet.

Zinc chloride serves as the electrolyte in dry cells. It serves as a condensing agent, a disinfectant, a dehydrator, a wood preservative, and a deodorant.

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Graph of area under force vs displacement shows work done. Thus A. is 30J, B. is -12J, C. 18J.

Amount of energy required for the displacement of an object at certain distance, is called work done.

Given,

along y(m) axis, each unit is 2m.

along Fy(N) axis, each unit is 2N.

A. Distance between y = A to y = B

W(AB) = 1/2×base×height

W(AB) = 1/2×10m×6N

W(AB) = 30J

B. Distance between y = B to y = C

W(BC) = 1/2×base×height

W(BC) = 1/2×6m×-4N

W(BC) = -12J

C. Distance between y = A to y = C

W(AC) =  W(AB)+W(BC)

W(AC) = 30J+(-12J)

W(AC) = 18J.

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The question is incomplete, but most probably the complete question is, attached in image:

displacement = 55 cm.Initial position = 25 cm,Final position = 80 cm,Displacement = final position-finitial position,Putting values in above formula,D = 80 cm - 25 cm,D = 55 cm,It means that the displacement of the ant is 55 cm.

Distance is the length of any path connecting any two places.As measured along the shortest path between any two points, displacement is indeed the direct distance between them.The direction is ignored when calculating distance.

Displacement is just the distance between an object's starting point and its final location, whereas distance is indeed the length of an object's path.

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Because of the logarithmic nature of the dB scale, a 10 dB gain in sound  in a ten-fold rise in sound pressure; for example, 100 dB is ten times louder than 90 dB, and 110 dB is one hundred times louder than 90 dB.

The quantity of air pressure variation that a noise source produces is known as sound pressure. Sound pressure is what we "hear" or interpret as loudness. The surface of the drum in our sample moves just a very small distance when it is struck extremely softly, producing minor pressure fluctuations and just a faint sound.

Sound levels are measured using decibels (dB). The sound of a running motorcycle engine is around 95 dB louder than normal conversation, which is about 60 dB louder than just a whisper. Long-term exposure to noise levels above 70 dB may cause damage to your hearing. Loud noise that is over 120 dB can instantly harm your ears.

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Answer:

To calculate the work being done by Lily, we need to use the formula:

Work = Force x Distance x cos(theta)

where:

Force = 2000 N (the force required to lift the ladder)

Distance = 8 m (the distance Lily lifts the ladder)

theta = 0 degrees (since Lily is lifting the ladder straight up, the angle between the force and the direction of motion is 0 degrees)

So, the work done by Lily is:

Work = 2000 N x 8 m x cos(0)

Work = 16000 joules

Therefore, the joules of work being put out by Lily when she lifts the 2000 N ladder above her head at a distance of 8 meters is 16000 joules.

Explanation:

The domain theory of magnetism explains that ferromagnetic materials such as iron are composed of tiny magnetic domains that are randomly oriented in the absence of a magnetic field.

These domains have their own magnetic fields that cancel each other out. When an external magnetic field is applied to the material, the domains align themselves with the field, resulting in a net magnetic field and the material becoming magnetized.

In the case of the bar of iron being magnetized by striking it repeatedly with a hammer while pointing it parallel to the earth's magnetic field, the mechanical energy from the hammer blows causes the domains to align themselves in the same direction as the earth's magnetic field. This alignment becomes "locked in" as the domains resist changing their orientation once aligned. Therefore, the bar of iron becomes magnetized and will remain so until it is demagnetized or its magnetic domains are realigned in a different direction by another magnetic field.

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The experiment's manipulable variable, making it the independent variable. The outcome being measured and contrasted between the two situations makes the temperature of the liquid in the cup the dependent variable (with and without the wool sock).

What is Temperature?

Temperature is a measure of the amount of heat energy in a system or object. More specifically, it is a measure of the average kinetic energy of the particles in a substance, such as atoms or molecules.

We must first make sure that both cups begin the experiment with the same volume of hot liquid at the same temperature. The liquid temperature in each cup could then be measured at certain intervals (e.g., every 15 minutes) for a predetermined amount of time (e.g., an hour), and the results could be recorded. To more precisely gauge the liquid's temperature, we might use use a thermometer.

We would compare the liquid's average temperature in each cup over the time we observed after the experiment. We may conclude that the wool sock was successful in maintaining the liquid at room temperature if the cup with the wool sock maintained a greater average temperature than the original cup.

It's vital to keep in mind that we should repeat the experiment several times to make sure that our results are consistent and not the result of chance and to increase the experiment's validity and reliability. Also, we ought to use a bigger sample size and account for any additional factors that can influence the liquid's temperature, such as the environment's temperature or the liquid's initial temperature.

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Answer: B

Explanation:

B. undergoes no change in velocity.

The speed of an object that is moving in a circle with constant speed remains constant. This means that the object is not speeding up or slowing down, and therefore it does not experience any change in velocity.

Answer:

pent fuel can be stored in two ways - either in pools at individual reactor sites or in dry casks at independent spent fuel storage facilities. Pools are large, water-filled containers in which nuclear reactor fuel is stored while it is not being used. Dry casks are heavy steel containers, or canisters, which are designed to store spent nuclear fuel safely and securely. Moving spent fuel to dry casks reduces the risks of a radiation release. [1] Currently, most spent nuclear fuel is safely stored in specially designed pools at individual reactor sites around the country. [2] All spent fuel should be transferred from wet to dry storage within five years of discharge from the reactor core. [3] 400,000 tons of spent nuclear fuel is stored at hundreds of sites across dozens of countries

Explanation:

Answer:

Spent fuel pools and dry cask storage

Explanation:

The spent-fuel-pool approach involves storing spent fuel assemblies in large pools of water that cool the assemblies and provide shielding from the radiation.

a bolt is dropped from a 1.3-meter ladder,the long will it take it to reach the ground is Ladder length: 4.27 m =2.14 meters away.

The metric system's and also the International System of Units' primary unit of length is the metre (m), also spelt as meter (SI). The British Imperial us And the Customary systems both convert it to a measurement of roughly 39.37 inches.

Approximately 3 feet, 3 inches are equal to one meter, which is the common metric unit. Therefore, a meter is a unit of measurement in the metric system. One meter long things include, but are not limited to, guitars, baseball bats, or yardsticks. In competitions like running and swimming, meters are also employed to gauge distances.

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Answer:

Let's check each option to see if it conserves momentum:

Option 1: p_after = 1 kg * 6 m/s + 2 kg * 2 m/s = 10 kg m/s (conserves momentum)

Option 2: p_after = 1 kg * 3 m/s + 2 kg * 4 m/s = 11 kg m/s (doesn't conserve momentum)

Option 3: p_after = 1 kg * 3.5 m/s + 2 kg * 3.5 m/s = 10.5 kg m/s (doesn't conserve momentum)

Option 4: p_after = 1 kg * (-2 m/s) + 2 kg * 6 m/s = 10 kg m/s (conserves momentum)

Option 5: p_after = 1 kg * 10 m/s + 2 kg * 0 m/s = 10 kg m/s (conserves momentum)

Option 6: p_after = 1 kg * (-4 m/s) + 2 kg * (-3 m/s) = -10 kg m/s (doesn't conserve momentum)

Therefore, options 1, 4, and 5 conserve momentum.

Explanation:

Answer:

The pedal is an application tool that applies the force over a short distance on the axle to move the wheel a greater distance with less force.

Explanation:

hope this helped

Answer:

Explanation:

Sorry if I made some mistakes, I completed it as fast as I could.

The acceleration of the object is - 4 m/s².

The acceleration of an object is the measure of change of velocity with change in time of motion.

Mathematically, the formula for acceleration is given as;

a = Δv / Δt

a = ( v₂ - v₁ ) / ( t₂ - t₁ )

where;

From the data given, we have;

velocity (m/s)                     time ( s )

20                                         1

16                                          2

12                                          3

8                                            4

4                                            5

a = ( 16 - 20 ) / ( 2  - 1 )

a = - 4 m/s²

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Answer:

Yes

Explanation:

Floor wax will provide enough grip on the floor to allow people to walk without slipping, even when the floor is wet. In conclusion, A layer of wax will give your workplace more beauty and brightness. It will add sparkle to your home or business and a clean look that will impress the visitor

Answer:

Applying wax on a floor can have several effects, including:

Protection: Wax can protect the surface of the floor from scratches, stains, and other forms of damage.

Shine: Wax can give the floor a shiny, polished look that can enhance its appearance.

Slip-resistance: Some types of wax can improve the slip-resistance of a floor by creating a slightly textured surface.

However, whether or not you can walk better on a shiny floor with barefoot depends on a few factors. If the floor is very smooth and the wax is very slick, it may be more difficult to walk on the surface, especially if your feet are wet or sweaty. On the other hand, if the wax creates a slightly textured surface, it may provide better traction and make it easier to walk on the floor. Additionally, some people may prefer the feeling of walking on a smooth, polished floor, while others may find it uncomfortable or unpleasant. Ultimately, the effect of applying wax on the floor will depend on the type of wax used, the condition of the floor, and the personal preferences of the individual walking on the surface.

Explanation:

Answer:

The coil rotates due to its inertia.

Maximum torque occurs when the plane of the coil is parallel to the magnetic field - consider the directions involved in F = I L B - the resulting force is perpendicular to I and B

The real cubic expansivity of the liquid is 1.98 x 10^-4 K^-1.

To find the real cubic expansivity of the liquid, we need to use the formula:

β = (1/V) (dV/dT)

where β is the real cubic expansivity, V is the volume of the liquid, and dV/dT is the rate of change of the volume with respect to temperature. We can use the fact that the two samples have the same volume to eliminate V from the equation.

The change in mass of the liquid between 0°C and 50°C is:

Δm = 44.25 g - 42.02 g = 2.23 g

To convert the change in mass to a change in volume, we need to divide by the density of the liquid:

ρ = m/V

V = m/ρ

We can use the density of the liquid at 0°C to calculate the volume:

V = 2.23 g / (density of liquid at 0°C)

Next, we can use the volume and temperature data to find the rate of change of the volume with respect to temperature:

dV/dT = (V2 - V1) / (T2 - T1)

dV/dT = (V(50°C) - V(0°C)) / (50°C - 0°C)

Finally, we can substitute these values into the formula for β:

β = (1/V) (dV/dT)

β = (1/[(2.23 g) / (density of liquid at 0°C)]) [(V(50°C) - V(0°C)) / (50°C - 0°C)]

Simplifying this expression gives:

β = (density of liquid at 0°C) [(V(50°C) - V(0°C)) / (50°C - 0°C)] / 2.23 g

We can estimate the density of the liquid at 0°C using the mass and volume data:

density of liquid at 0°C = 44.25 g / V(0°C)

Substituting this into the expression for β gives:

β = [(44.25 g / V(0°C))] [(V(50°C) - V(0°C)) / (50°C - 0°C)] / 2.23 g

Simplifying this expression gives:

β = (V(50°C) - V(0°C)) / (50°C - 0°C) / V(0°C) x 44.25/2.23

β = (V(50°C) - V(0°C)) / (50°C x V(0°C)) x 19.8

We can estimate the change in volume using the linear expansivity of the glass:

ΔV = V(50°C) - V(0°C) = V(0°C) α ΔT

ΔV = V(0°C) (1.0 x 10^-5 K^-1) (50°C)

Substituting this into the expression for β gives:

β = [V(0°C) (1.0 x 10^-5 K^-1) (50°C)] / (50°C x V(0°C)) x 19.8

β = 1.0 x 10^-5 K^-1 x 19.8

β = 1.98 x 10^-4 K^-1

Therefore, the real cubic expansivity of the liquid is 1.98 x 10^-4 K^-1 using linear expansivity.

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