elena (60.0 kg) and madison (65.0 kg) are ice-skating at the rockefeller ice rink in new yok city. their friend tanner sees elena move to the right with a speed of 1.20 m/s towards madison. madison is moving to the left at a speed of 2.50 m/s towards elena. what is elena's momentum? (assume the positive direction is to the right and the negative direction is to the left.)

RFID (Radio Frequency Identification) tags have their own transmitter and a power source, typically a battery.

RFID tags are small electronic devices that can be attached to or embedded in various objects, allowing them to be tracked and identified using radio waves.

These tags contain a microchip that stores information about the object they are attached to, and a transmitter that sends this information wirelessly to an RFID reader.

There are two types of RFID tags: active and passive.

Active RFID tags have their own power source (typically a battery) and can transmit information over longer distances than passive tags, which rely on the energy of the RFID reader to transmit their information.

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This question involves the concepts of the speed of sound, frequency, and temperature.

The temperature of the air is "14.24 °C".

First, we find the speed of sound at the given temperature:

v = fλ

where,

Therefore,

v = (695 Hz)(0.49 m)

v = 340.55 m/s

Now, the relationship between the speed of sound and temperature can be given by the following formula:

\(\frac{v}{v_o} = \sqrt{\frac{T}{273\ k}}\\\\T = (273\ k)(\frac{v}{v_o})^2\\\\\)

where,

Therefore,

\(T = (273\ k)(\frac{340.55\ m/s}{332\ m/s})^2\)

T = 287.24 k = (278.24 k -273) °C

T = 14.24 °C

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Answer:

No

Explanation:

She will not be able to measure the length of her window accurately due to instrumental error from her choice of instrument. The elastic nature of her tape would alter the measurement because it will stretch as she is taking her readings, thus reducing the true measurement of the length of her window.

To measure the length of her window, she could use an inelastic tape rule or a metre rule. These instruments would eliminate instrumental error.

Answer:

Linear magnification = 1/3

Explanation:

Given:

Convex mirror

Object's distance from pole = 2f

Find:

Linear magnification

Computation:

Object distance, u = −2f

So,

1/v + 1/u = 1/f

1/v + 1/(-2f) = 1/f

1/v = 1/f + 1/2f

BY taking LCM

1/v = 3 / 2f

v = 2f / 3

Magnification, M = -v / u

So,

Magnification, M = (2f / 3) / 2f

Magnification, M = 2f / 6f

Magnification, M = 2 / 6

Linear magnification = 1/3

Answer:

in region AB the body was not moving

in region BC the body was moving forward with a increasing velocity therefore accelerating constantly

in region CD the body was moving with a constant velocity hence zero acceleration

in region DE the body was moving backwards decelerating

Answer:

lighter ones will go faster

Explanation:

assuming you throw both bolwing ball with 10N of force. one is 3kg and the other is 5kg.

by using the equation: F = ma

a = F/m

a = 10/5 = 2m/s^2

a = 10/3 = 3.33333 m/s^2

Answer:

Effort = 540 Newton

Explanation:

Given the following data;

Load arm = 60 cm

Effort arm = 40 cm

Load = 360 N

Conversion:

100 cm = 1 meters

40 cm = 40/100 = 0.4 meters

60 cm = 60/100 = 0.6 meters

To calculate the effort that Reha should apply to lift Neha, we would use the expression;

Effort * effort arm = load * load arm

Substituting into the expression, we have;

Effort * 0.4 = 360 * 0.6

Effort * 0.4 = 216

Effort = 216/0.4

Effort = 540 Newton

Answer is the hind brain

The brainstem is located under the forebrain and midbrain. Therefore option D is correct.

The brainstem is located under both the forebrain and midbrain. It is a vital component of the central nervous system that connects the brain to the spinal cord and controls many essential functions such as breathing, heart rate, and digestion.

It consists of three main regions: the medulla oblongata, pons, and midbrain. The forebrain, midbrain, and hindbrain together constitute the major divisions of the brain.

The hindbrain is positioned below the midbrain and includes structures like the cerebellum, pons, and medulla oblongata.

The brainstem, specifically its lower regions, is responsible for relaying information between the brain and the rest of the body while regulating critical bodily functions.

Therefore option D is correct.

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Answer:

600

Explanation:

The correct statements include:

option A, B, C, D

The Incorrect statements include:

Different types of electromagnetic radiation are fundamentally different types of waves. (All types of electromagnetic radiation are fundamentally the same type of wave but have different frequencies and wavelengths.)

The only type of electromagnetic radiation that is actually considered light is visible light. (All types of electromagnetic radiation are considered light, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.)

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Answer: A B C D

Explanation: k12 I had this quiz

The efficiency of the system, consisting of a 3-ohm heater submerged in 1200 grams of water, is approximately 101.2% based on the given information.

To determine the efficiency of the system, we need to calculate the energy input and the energy output.

The energy input is given by the formula:  Energy input = Voltage × Current × Time

Since the heater has a resistance of 3 ohms and operates at 6 amperes for 3.95 hours, we can calculate the energy input as follows:

Energy input = (Voltage × Current) × Time = (Voltage² / Resistance) × Time

Given that the voltage is unknown, we need to solve for it. We can use Ohm's law to find the voltage: Voltage = Current × Resistance = 6 A × 3 Ω = 18 V

Now we can calculate the energy input: Energy input = (18² / 3) × 3.95 = 381.6 Joules The energy output can be calculated using the specific heat capacity of water and the change in temperature: Energy output = (Mass of water + Water equivalent) × Specific heat capacity × Change in temperature

Given that the mass of water is 1200 grams, the water equivalent is 200 grams, the specific heat capacity of water is approximately 4.18 J/g°C, and the change in temperature is 70°C, we can calculate the energy output: Energy output = (1200 + 200) × 4.18 × 70 = 386,360 Joules

Finally, we can calculate the efficiency of the system: Efficiency = (Energy output / Energy input) × 100 Efficiency = (386,360 / 381.6) × 100 ≈ 101.2% Therefore, the efficiency of the system is approximately 101.2%.

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The schools in Uganda and Minneapolis are similar because both are places where students learn and neither has a large enough room.

Due to poor economic conditions and management, the schools of Uganda and Minneapolis have small rooms in which students sit to learn. Both are the places where students comes to learn and make better their economic condition so we can conclude that option C and F are correct.

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The time it takes for light to travel from the lightning to your eyes can be calculated using the speed of light, which is approximately 300,000 kilometers per second.

Since the lightning is 1.6 kilometers away, we can use the formula: time = distance / speed. Plugging in the values, we have: time = 1.6 km / 300,000 km/s. Simplifying the calculation gives us a time of approximately 0.0000053 seconds, or 5.3 microseconds. For sound, we need to use the speed of sound, which is around 343 meters per second. Since the lightning is 1.6 kilometers away, we convert it to meters by multiplying by 1000: distance = 1.6 km * 1000 m/km = 1600 meters. Now we can use the formula time = distance / speed: time = 1600 m / 343 m/s. Simplifying the calculation gives us a time of approximately 4.7 seconds. In conclusion, it takes about 5.3 microseconds for the light from the lightning to reach your eyes, and about 4.7 seconds for the sound to travel to your ears when the lightning is 1.6 kilometers away.

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Answer:

The angle between the two vectors is 60°

Explanation:

Let A and B represent the two vectors, we have;

\(\left | A \right | = \left | B \right | = \left | A + B\right |= \left | R\right |\)

Let \(\left | A \right |\) = a, \(\left | B\right |\) = b, and \(\left | R\right |\) = c

We have by cosine rule

c² = a² + b² - 2 × a × b × cos(C)

Where, the angle "C", is the angle between the resultant of the two vectors, a and b and facing the resultant \(\left | R\right |\)

Given that, a = b = c, we have;

a² = a² + a² - 2 × a × a × cos(C)

a² = 2·a² - 2 × a² × cos(C)

2 × a² × cos(C) = 2·a² - a²

cos(C) = a²/(2·a²) = 1/2

Therefore, angle ∠C = arccosine(1/2) = 60°

The angle between the two vectors = ∠C = 60°.

The statement illustrates how engineering has influenced society in that People want the cameras in their cell phones to be able to capture high-resolution images. Option C is corect.

A digital camera that creates pictures that can be saved on a computer and seen on a screen.

People want their mobile phone cameras to be able to take high-resolution pictures, which shows how engineering has affected society.

Statement B illustrates how engineering has influenced society.

Hence option C is correct.

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The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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Heat capacity is the amount of heat required to raise the temperature of an object by 1oC. The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1oC.

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The independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.The dependent variable, the one that you measure the response in, is the distance that the washers travel.

The independent variable in an experiment is the variable that is manipulated by the researcher. It is the variable that is intentionally changed by the researcher to examine the impact of this change on the dependent variable.The dependent variable, on the other hand, is the response that is measured by the researcher.

It is the variable that is being influenced by the independent variable in an experiment. Thus, in the given experiment, the car's hitting the barrier is the independent variable while the distance that the washers travel is the dependent variable.

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The resistance of the battery if a current of 23A flows through a circuit and the battery produces a potential difference of 9V is 0.39 ohms.

Resistance is the force that tends to oppose motion. It is measured in ohms. The resistance of a battery can be calculated using the following formula;

V = IR

Where;

According to this question, a current of 23A flows through a circuit and the battery produces a potential difference of 9V. The resistance can be calculated as follows:

R = V/I

R = 9/23

R = 0.39ohms

Therefore, 0.39ohms is the resistance of the battery.

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The distance travelled after John slamming the brakes of his car moving at 26.7 m / s is 53.4 m

V = d / t

V = ( u + v ) / 2

V = Average velocity

d = Distance

t = Time

u = Initial velocity

v = Final velocity

u = 26.7 m / s

v = 0

V = ( 26.7 + 0 ) / 2

V = 13.35 m / s

t = 4 s

d = 13.35 * 4

d = 53.4 m

Average velocity is the overall velocity of the object in a given amount of time. Average velocity is the distance covered in a given amount of time. Its unit is m / s.

Therefore, the distance travelled after John slamming the brakes of his car is 53.4 m

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The final speed of the rocket, given it started with a speed of 120 m/s and slows down at a rate of 22 m/s² for 4 seconds is 208 m/s

From the question given above, the following parameters were obtained:

The final speed of the rocket can be obtained as follow:

v = u + at

v = 120 + (22 × 4)

Clear bracket

v = 120 + 88

v = 208 m/s

Thus, we can conclude from the calculation above that the final speed of the rocket is 208 m/s

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Answer:

biking

Explanation:

To make the Bike move you peddle with your legs.

Hi there!

A neutral metal sphere is comprised of both ELECTRONS and PROTONS.

Recall that electrons have a NEGATIVE (-) charge, and protons have a POSITIVE (+) charge.

Opposite charges attract, and like charges repel.

In this instance, the positively-charged rod will cause the electrons in the neutral metal sphere to move towards the side facing the rod (opposite charges attract), which causes the two to be attracted to one another.

The angular velocity of the cylinder needs to be 0.6814 rad/s

The centripetal acceleration due to the rotation of the cylinder is given by the equation:

a = ω2r

Where a is the centripetal acceleration, ω is the angular velocity, and r is the radius of the cylinder. We can rearrange this equation to solve for ω:

ω = √(a/r)

Since we want the centripetal acceleration to be equal to the acceleration due to gravity on Earth, we can substitute in the appropriate values:

ω = √(9.8 m/s2/2.5 km)

ω = 0.6814 rad/s

What is centripetal acceleration?

Centripetal acceleration is the acceleration of an object moving in a curved path that is directed towards the center of the circle that it is moving in. It is caused by the force of the object's inertia, and is equal to the square of its velocity divided by the radius of the circle.

Therefore, The angular velocity of the cylinder needs to be 0.6814 rad/s

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car's maximum cornering speed on a rainy day when the coefficient of static friction has been reduced by 50% is 27.58 m/s

Car's maximum speed at dry Sunny day,

Vs = √μrg = 39 m/s

Speed at rainy day, μ becomes 0.5μ

Vr = √(0.5*μ*r*g) =√(0.5) * (39) = 27.57716

Vr = 27.58 m/s

An object experiences static friction when a force is applied to it; as a result, the object resists the applied force and stays at rest until static friction is removed. In kinetic friction, the frictional force opposes an object's motion. An item is kept at rest by the force of static friction. The phrase "static friction" can be defined as "the friction people perceive when they attempt to move a stationary object on a surface, but without actually causing any relative motion in between  surface and the body it is on. A force acting in opposition to the direction of a moving body on the surface is felt.

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