John needs to measure the brightness of a light bulb using the metric system. in which unit does he express his measurement?
A. liter
B. meter
C. kilogram
D. candela

The number of revolutions per minute which a 25 m diameter ferris wheel would need to make for the passengers to feel weightless is 7.84 rotations per minute.  

The rotational speed of a ferris wheel needs to reach 8.5 revolutions per minute (RPM) for passengers to experience weightlessness. To calculate the RPM of a 25m diameter ferris wheel, use the formula:

RPM = (distance/circumference) × 60.

The circumference of a 25 m ferris wheel is 157.07m. Therefore, the RPM of a 25m ferris wheel would be:

RPM = (25m/157.07m) × 60 = 7.84 RPM

Therefore, a 25m ferris wheel would need to rotate at a rate of 7.84 RPM for passengers to experience weightlessness.

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Answer:

The answer is 39.3

Explanation:

It's average velocity Is 96 km/h east and it's average speed is ​ 96 km/h.

To calculate the average velocity, we need to find the total displacement of the car and the total time taken.

The car moves at 120 km/h for 3 hours, so the total displacement during this time is:

displacement = velocity x time = 120 km/h x 3 h

                       = 360 km east

The car then moves at 60 km/h for 2 hours, so the total displacement during this time is:

displacement = velocity x time

                      = 60 km/h x 2 h

                       = 120 km east

The total displacement of the car is the sum of these displacements:

total displacement = 360 km + 120 km

                               = 480 km east

The total time taken by the car is:

total time = 3 h + 2 h

               = 5 h

Therefore, the average velocity is:

average velocity = total displacement / total time

                            = 480 km / 5 h

                              = 96 km/h east

To calculate the average speed, we need to find the total distance traveled by the car and the total time taken.

The car travels at 120 km/h for 3 hours, so the distance traveled during this time is:

distance = velocity x time

               = 120 km/h x 3 h

               = 360 km

The car then travels at 60 km/h for 2 hours, so the distance traveled during this time is:

distance = velocity x time

              = 60 km/h x 2 h

              = 120 km

The total distance traveled by the car is the sum of these distances:

total distance = 360 km + 120 km

                        = 480 km

Therefore, the average speed is:

average speed = total distance / total time

                         = 480 km / 5 h

                           = 96 km/h

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Answer:

a

Explanation:

Answer:

You're best answer to your question would be C!!!

Answer:

Endurance exercise and Strength exercise

Explanation:

Answer:

Aerob exercise and strength exercise

Explanation:

Answer:

b. d. f.

Explanation:

Got it right on Edge

Answer:

2. Gina gathers information about a court case.

4. Hana interviews and advises a person who has been accused of a crime.

6. Dewayne creates the paperwork for a business contract.

An unpolarized beam of light with an intensity of 2000 w/m² is incident on two ideal polarizing sheets, the emerging light intensity is approximately 1968.13 W/m².

Malus's law can be used to determine the intensity of the light that emerges from a pair of perfect polarising sheets after an unpolarized beam of light passes through them.

According to Malus's law, the amount of light that passes through a polarizer is determined by:

I = I₀ × cos²θ,

In this case,

The incident intensity I₀ = 2000 W/m²

The angle between the two polarizers = 0.157 rad.

Applying Malus's law twice, we have:

I = I₀ × cos²(0.157) × cos²(0.157)

≈ 2000 × (cos²(0.157))².

Evaluating this expression, we find:

I ≈ 2000 × (0.992)²

≈ 2000 × 0.984064

≈ 1968.13 W/m².

Thus, the emerging light intensity is approximately 1968.13 W/m².

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Answer:

7.8 miles just did it

Explanation:

i don't Know

Explanation:

learn from yourself.

The energy of the high energy neutron is 940.51 MeV.

Speed is nothing but the distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity with the SI unit meter/second.

We know that mass of the neutron m₀ = 939.6 MeV/c²

A high energy neutron is travelling at a speed of 18 million m/s.

Given that, v = 1.8 * 10⁷ m/s

The energy of neutron is calculated with the formula, m₀* c²/√(1 - v²/c²)

⇒ 939.6 * (3* 10⁸)²/√[1 - (1.8 * 10⁷)²/(3* 10⁸)²]

⇒ 940.51 MeV

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The charge of the particle in this situation is positive. When a charged particle is immersed in a uniform magnetic field, it experiences a force known as the Lorentz force, which is given by the equation:

F = q(v × B)

Where F is the Lorentz force, q is the charge of the particle, v is the velocity of the particle, and B is the magnetic field.

In this case, the particle is moving along a circular path in the counter-clockwise direction, which means that the force acting on the particle is directed towards the center of the circle. This force is known as the centripetal force, and it is given by the equation:

F = mv^2/r

Where m is the mass of the particle, v is the velocity of the particle, and r is the radius of the circle.

Since the Lorentz force and the centripetal force are equal in magnitude and opposite in direction, we can equate the two equations to get:

q(v × B) = mv^2/r

Rearranging the equation and solving for q gives:

q = mv^2/(rB)

Since the particle is moving in the counter-clockwise direction, the velocity vector v is directed tangentially to the circle, and the magnetic field vector B is directed out of the page. The cross product of these two vectors is directed towards the center of the circle, which means that the charge of the particle must be positive in order for the Lorentz force to be directed towards the center of the circle.

Therefore, the charge of the particle in this situation is positive.

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The average speed is 22 m/s. so, the value is less than 23.0 m/s.

Given:

Time  T1 = 16.0 m/s, 10.0 min

Time  T2 = 28.0 m/s, 10.0 min.

Average speed = distance / time ;

v =  [  16×10 ×60  + 28×10×60  ]  /  [ 10×60 + 10×60  ]

v = 22 m /s

The Actual Speed is the calculated velocity at which the axis is presently moving, as computed from the alternate within side the Transducer Counts repute register. The Actual Speed is in function devices according to second.

Speed has the dimensions of distance divided via way of means of time. The SI unit of velocity is the metre in keeping with the second (m/s), however, the maximum not unusual place unit of velocity in regular utilization is the kilometre in keeping with the hour (km/h) or, within side the US and the UK, miles in keeping with the hour (mph). For air and marine travel, the knot is normally used.

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Answer:

1 B      2 D  3  D    4 DC  wire  ferrite   5 D

Explanation:

Answer:

A generator is a device that converts mechanical energy into electrical energy by rotating a coil of wire in a magnetic field.

Answer:

1a) Transverse wave.

1b) Ripples on the surface of water.

1c) See first attachment.

1d)  See below for explanation.

2a) Longitudinal wave.

2b) Sound waves.

2c) See second attachment.

2d)  See below for explanation.

Part 2) 54 m/s

Explanation:

a)  The wave in the picture is a transverse wave.

In transverse waves, the oscillations are at right angles to the direction of wave travel.

b)  A real world example of a transverse wave is ripples on the surface of water.

c)  See first attachment.

d)  The amplitude is the maximum displacement of a point of a wave from its resting position.  It is measured by calculating the difference in height between a crest and the resting position (mid-line).

a)  The wave in the picture is a longitudinal wave.

In longitudinal waves, the oscillations are parallel to the direction of wave travel.

b)  A real world example of a longitudinal wave is sound waves.

c)  See second attachment.

d)  The amplitude is the maximum displacement of a point of a wave from its resting position.  It is measured by calculating the distance between the particles in the areas where it is compressed.

Wave Speed

\(\large\boxed{v=f \lambda}\)

where:

Given values:

Substitute the given values into the formula and solve for speed:

\(\implies v=60.0 \times 0.90\)

\(\implies v=54\;\sf m/s\)

Therefore, the speed of the wave is 54 m/s.

The maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

To calculate the maximum possible speed of the train at the end of the first 4.0 km of the journey, we can apply the principle of conservation of energy.

Assuming there are no external forces like friction or air resistance, the initial potential energy of the train will be converted into kinetic energy.

The potential energy (PE) of the train at the beginning of the journey can be calculated as PE = mgh, where m is the mass of the train, g is the acceleration due to gravity (approximately \(9.8 m/s^2\)), and h is the height difference (in this case, we assume it to be zero).

The kinetic energy (KE) of the train at the end of the 4.0 km journey can be calculated as \(KE = (1/2)mv^2\), where v is the velocity of the train.

Since the potential energy is converted into kinetic energy, we can equate the two expressions:

PE = KE

\(mgh = (1/2)mv^2\)

Simplifying and canceling out the mass:

\(gh = (1/2)v^2\)

Substituting the values, \(g = 9.8 m/s^2\)and h = 0, we get:

\((9.8 m/s^2)(0) = (1/2)v^2\)

Simplifying further:

\(0 = (1/2)v^2\)

This equation tells us that the maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

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The wavelength of the  radio wave in water is 222nm

The relationship between the refractive index  wavelengths in a vacuum and in water is given by:

n = λ1/λ2

So,

let λ1 be the wavelength of light in a vacuum

λ2 be the wavelength of light in water.

nwater = 1.33

Plugging in values, we have

n = λ1/λ2

1.33 =295 m /λ2

λ2 = 295 m/1.33

 = 221.80nm

 ≈222nm

Therefore the wavelength of radio wave in water is 222mn.

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3415.2 grams

Explanation

to solve this we can use a rule of three

Step 1

Let

water= 100-84%= 16%

so,

for the water , 1 mL = 1 gram , so

now, let represents the mass of the aluminiu, so

a) the ratio is the same, so we have a proportion

Step 2

finally, solve for x

so, the mass of the aluminum is

3415.2 grams

The objective lens should be 9.0 cm from the specimen in order for the microscope to be in focus.

A microscope is an instrument used to magnify objects that are too small to be seen with the nak ed eye. It consists of a lens system that collects light from the object and produces a magnified image in the eyepiece. A microscope can be used to observe bacteria, cells, and other microscopic organisms, and to analyze materials at the atomic and molecular level. Microscopes have become an essential tool in the fields of biology, medicine, and scientific research. They have also been used to observe and measure the texture, color, and structure of materials in the arts and manufacturing.

This is because the focal length of an objective lens is defined as the distance from the lens to the focal point, which is the point at which light rays coming from a distant object converge to a sharp focus. Therefore, since the focal length of the objective lens is 9.0 mm, the lens should be 9.0 cm from the specimen in order to be in focus.

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Fibers of the sweater lose electrons because electrons are leave it.

One of the ways of charging a body is by friction. Charges are transferred from one body to another when an object is rubbed against another. This is charging by friction.

A sweater has negative charges hence when the balloon is rubbed against the sweater, fibers of the sweater lose electrons because electrons are leave it.

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The way how charged particles interact is demonstrated with the Charge Launcher Gizmo. Tiny charged particles have the ability to attract (pull together) or repel (push apart) one another, just like magnets.

The positive charge is present in the red particles.

The red particle took a slightly bent downhill route when it was launched from the upper left corner of the grid.

The blue particles are negatively charged. This particle is fixed, which means it is affixed to the grid. The blue particle took the same course downhill when it was released from the upper right corner of the grid and at the very end it curled upward.

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Answer:The maximum height you could jump on the moon with a velocity of 3 m/s is 4.5 meters.

Explanation:

To calculate the maximum height that you could jump on the moon, you can use the following formula:h = (v^2) / (2 * g)where h is the maximum height, v is the initial velocity, and g is the acceleration due to gravity. On the moon, g is approximately 1.6 m/s^2. Substituting the values, we get:h = (3^2) / (2 * 1.6) = 4.5 m

So the maximum height you could jump on the moon with a velocity of 3 m/s is 4.5 meters.

The cannonball will be in flight for approximately 1.17 seconds before striking the ground.

Given the following information: Cannonball is launched horizontally off a 30 m high castle wall with a speed of 60 m/s. Since the cannonball is launched horizontally, there is no initial vertical velocity. This means that the horizontal velocity of the ball will remain constant throughout the flight period. Using the equation:

time = distance / velocity

Since there is no horizontal acceleration, the horizontal distance travelled by the ball would be the horizontal distance between the point of launch and the point of impact on the ground. Thus, we can calculate the horizontal distance using the formula:distance = velocity x time

Thus, the time taken for the ball to reach the ground would be given by: time = distance / velocity= 70 m / 60 m/s = 1.17 seconds Therefore, the cannonball will be in flight for approximately 1.17 seconds before striking the ground.

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Answer:

An expansion gap is a term used when fitting wooden flooring. It is an essential gap that must be left around the edge of the room when fitting hardwood, bamboo or laminate flooring.

Explanation: i hope it helps

An observation is information we gather about something by using the senses.

Answer:

La masa de la mascota es de 11,24 kg.

Explanation:

Dado que la masa total de = 80 kg

Tenemos

Fuerza de fricción = 80 kg × 9.81 × 0.3 = 235.44 N

La mascota salta horizontalmente con una velocidad, v, de 6.0 m / s para dar un movimiento de 1 m a la caja de masa y a la persona

Trabajo realizado por el salto de la mascota = (80 - m) × 9.81 × 0.3

La energía del movimiento del perro = 1/2 × m × v² = Trabajo realizado al saltar de la mascota

1/2 × m × 6² = (80 - m) × 9.81 × 0.3

20943 · m = 235440

m = 235440/20943 = 11,24 kg

Answer:

A base on scientific event

Explanation:

theories can changeD

they dont explain unusual phenomenaB

Nothing is personal in scienceC

Answer:

don't know

Explanation:

don't know cause i don't read physic

Answer:

Study of static electricity and the condition under which electricity is conducted by different substances.