A 100 W engine generates 100 J of energy. How long did it run for?

2.5 watt

Explanation:

we know

power = work done /time

work done gainst gravity is = mgh

as mg = weight = force = 5 N

and height = 2 m

so work done = mgh = 5*2 = 10N

therefore ,

Power = 10/4 = 2.5 watt

Answer:

This question is asking to identify the following variables:

Independent variable (IV): Battery

Dependent variable (DV): Time the clock stopped

Constant: Same clock

Control: No stated control

Explanation:

The independent variable in an experiment is the variable that is subject to manipulation or change by the experimenter. In this experiment, the independent variable is the BATTERIES (Duracell, Energizer, Kroger brand, EverReady).

The dependent variable is the variable that responds to the changes made to the independent variable. It is the variable that the experimenter measures. In this case, the dependent variable is the TIME IT TAKES FOR THE CLOCK TO STOP.

Constants or control variable is the variable that the experimenter keeps constant or unchanged for all groups throughout the experiment in order not to influence the outcome of the experiment. The constant in this case is the SAME CLOCK USED.

Control group is the group that does not receive the experimental treatment or independent variable in an experiment. In this case, all groups received a different kind of battery.

Answer:

Muscular energy

Explanation:

Hope it helps!!!!

The kinetic energy of the flywheel after 1 minute of rotation, given that it has a mass of 50 and radius of 40 cm is 32.4 KJ (Option D)

We'll begin by obtaining the velocity of the flywheel. This is shown below:

v = at

v = 0.6 × 60

v = 36 m/s

Finally, we shall determine the kinetic energy of the flywheel. Details below:

KE = ½mv²

KE = ½ × 50 × 36²

KE = 25 × 1296

KE = 32400 J

Divide by 1000 to express in KJ

KE = 32400 / 1000

KE = 32.4 KJ

Thus, the kinetic energy is 32.4 KJ (Option D)

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Answer:

weight, acceleration

Explanation:

weight = mass x gravity(meaning the direction of the mass)

acceleration = v-u/t

v-u is the change in velocity

If an airplane is  is accelerating down a runway at 2.5 m/s². It's velocity changes 2.5 m/s in each second.

Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Hence, the velocity of the airplane changes 2.5 m/s in each second  when it  is accelerating down a runway at 2.5 m/s².

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Answer:

B.

Explanation:

Laser light is different from normal light in other ways as well. First, its light contains only one wavelength (one specific color). ... Whereas a laser generates a very tight beam, a flashlight produces light that is diffuse. Because laser light is coherent, it stays focused for vast distances, even to the moon and back

The concept of the centrifugal force is used for producing an effective imitation of gravity. It is an important concept in the mechanics.

when any body is executing circular motion about a fixed axis, an outward force act on that object to balance the body and to execute the circular motion. The outward force is known as the centrifugal force.

It is the pseudo force act in order to balance the centripetal force acting inward during the circular motion.

The centrifugal force is comes into the picture when any body executes circular motion about a fixed axis.

To simulate gravity for the inhabitants, the concept of the centrifugal force is used.

Hence, the concept of the centrifugal force is used for producing an effective imitation of gravity.

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The current carried by the wires will be equal only if they have equal cross sectional area.

Current density of a conductor is defined as the amount of current flowing per unit cross sectional area of the conductor.

Here,

It is given that the two wires which are made of different materials have the same uniform value for current density.

We know that current density is the ratio of the current flowing through the conductor and the area of cross section of the conductor.

The equation for current density is,

  J = I/A

where I is the current flowing through the conductor and A is the area of cross section.

From the ratio,

We can say that, in order to keep the current density of both the wires same, the ratio between their current and area must be the same.

For the current carried by both wires to become same, the area of cross section of the wires must be same.

Hence,

The current carried by the wires will be equal only when they have equal cross sectional area.

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a) Total mechanical energy of the object-spring system = 0.198 J

b) Maximum speed of the oscillating object = 0.269 m/s

c) Maximum magnitude of acceleration of the oscillating object = 1.72 m/s2

What is acceleration?

Acceleration is the name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both.

Mass of the object = m = 5.5 kg

Force constant of the spring = k = 225 N/m

Amplitude of the motion = A = 4.2 cm = 0.042 m

Total mechanical energy of the object-spring system = E

Total mechanical energy is equal to the maximum potential the spring can store in this motion.

(a) \($E=\frac{1}{2} \times 300 \times 0.037^2$\)

\($$E=0.20535 \text { Joules }$$\)

Maxmium speed, \($v_{\max }=$\) AeO

\($$\begin{gathered}\omega=\sqrt{\frac{k}{m}}=\sqrt{\frac{300}{5.5}} \\\omega=7.3855 \mathrm{rad} / \mathrm{s} \\v_{\max }=0.037 \times 7.3855 \\V=0.273 \mathrm{~m} / \mathrm{s}\end{gathered}$$\)

(C) Maximim acceleration, \($a_m=A \omega^2$\)

\($$\begin{aligned}a_{\max } & =0.037 \times 7.3855^2 \\a_{\max } & =2.018 \mathrm{~m} / \mathrm{s}^2\end{aligned}$$\)

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Answer:

Heat is a form of energy. It is measured in Joules. ... The temperature of an object relates to both the kinetic energy of its particles and the number of particles. Temperature is the average kinetic energy of the particles in a substance.

Explanation:

In a DC generator, the generated electromotive force (emf) is directly proportional to the rotational speed of the generator's armature and the strength of the magnetic field within the generator.

This relationship is described by the equation for the generated emf in a DC generator:

Emf = Φ * N * A * Z / 60

Where:

Emf is the generated electromotive force (in volts),

Φ is the magnetic flux density (in Weber/meter^2\(meter^2\) or Tesla),

N is the number of turns in the armature winding,

A is the effective area of the armature coil (in square meters),

Z is the total number of armature conductors, and

60 is a constant representing the conversion from seconds to minutes.

From this equation, we can see that the generated emf is directly proportional to the magnetic flux density (Φ) and the product of the number of turns (N), effective area (A), and the total number of armature conductors (Z). This means that increasing any of these factors will result in a higher generated emf.

The magnetic flux density (Φ) can be increased by using stronger permanent magnets or increasing the strength of the field windings in the generator.

The number of turns (N) and the effective area (A) are design parameters and can be optimized for a specific generator. Increasing the number of turns or the effective area will result in a higher generated emf.

Similarly, the total number of armature conductors (Z) can be increased to enhance the generated emf.

By controlling and optimizing these factors, the generated emf in a DC generator can be increased, resulting in higher electrical output. However, it is important to note that there are practical limits to these factors based on the design and construction of the generator.

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The required speed with which the pebble strikes the ground when the pebble is fired from the slingshot with specified initial velocity is calculated to be 29.53 m/s.

The initial speed of the pebble with which it is fired is 15 m/s.

The height of the building is given as 33 m.

Acceleration due to gravity g = 9.8 m/s²

Now, let us calculate the velocity of the pebble with which it strikes the ground.

The suitable equation of motion is, v² - u² = 2 a s

where,

v is final velocity

u is initial velocity

a is acceleration

s is distance

Entering the values into the above equation by making v as subject, we have,

v² - u² = 2 a s

v² = u² + 2 a s

v = √(u² + 2 a s) = √[15² + 2(9.8)(33)] = √(225 + 646.8) = √871.8 = 29.53 m/s

Thus, the final velocity is calculated to be 29.53 m/s.

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Answer:

88.89 km/h.

Explanation:

D = S + T

   = 320km + 320km = 640km.

T = D/S

T1 = 320km / 80km/h = 4 hours

T2 = 320km / 100 km/h = 3.2 hours

Ttotal = T1 + T2 = 4 hours + 3.2 hours = 7.2 hours.

S = D/T

  = 640km / 7.2 hours

  = 88.89 km/h.

*Note:

S = Average speed.

D = Total distance.

T = Total time.

The average speed of the motorist for the entire trip is approximately 88.89 km/h.

To calculate the average speed of the motorist for the entire trip, we need to consider the total distance traveled and the total time taken. In this case, the motorist travels 320 km at 80 km/h and then another 320 km at 100 km/h.

First, let's calculate the time taken for each leg of the trip:

Time taken for the first 320 km at 80 km/h:

Time = Distance / Speed = 320 km / 80 km/h = 4 hours

Time taken for the second 320 km at 100 km/h:

Time = Distance / Speed = 320 km / 100 km/h = 3.2 hours

Now, let's calculate the total distance and total time for the entire trip:

Total distance = 320 km + 320 km = 640 km

Total time = 4 hours + 3.2 hours = 7.2 hours

Finally, we can calculate the average speed:

Average speed = Total distance / Total time = 640 km / 7.2 hours ≈ 88.89 km/h

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Explanation is\(^{}\) in a file

bit.\(^{}\)ly/3tZxaCQ

Answer:

my c-ock and balls be rotating im gunna be hxrny all day every day im gunna f-u-ck u and r-ape ur family girls should go back to the kitchen and hope not to be beat by their husband uh yea mhm girls desurve to be r-aped f-u-ck buck suck c-u-ck

Explanation:

Answer:

3.75

Explanati

Answer:

Snell's Law:    N1 sin θ1 = N2 sin θ2

n1 sine1 = n2 sin 82 fits this description

The formula that represents Snell's law is n₁sinθ₁ = n₂sinθ₂. Thus, the correct solution is option B.

When light rays from one medium enter into another medium (rarer to denser medium), the speed of light rays is decreased when light rays enter from rarer to denser medium. This is called as refraction of light rays.

The laws of refraction give Snell's law. The ratio of the sine of the angle of incidence and the ratio of the sine of the angle of refraction is equal to constant (μ) is called Snell's law.

The Snells law, sin i / sin r = μ, where i is the angle of incidence and r is the angle of refraction. μ is the refractive index of the medium. The refractive index remains constant for the medium.

From the given,

Snell's law is written as, sin i / sin r = n₁/n₂, where n₁ and n₂ is the refractive index of the medium. Thus, n₁sin(i) = n₂sin(r).

Thus, the ideal solution is option B.

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Any wave in which the motion of the medium's particles is parallel to the wave's direction is referred to as a longitudinal wave.

Imagine that a slinky is stretched out horizontally across the classroom, and that the left end of the slinky receives a pulse from the left and right vibrations of the first coil. From left to right, energy will start to move through the slinky. The individual coils of the medium will be shifted left and right as the energy moves from left to right. The medium's particles in this instance travel in a direction parallel to the pulse's. A longitudinal wave is this kind of wave. Particle motion is consistently parallel to wave motion in longitudinal waves.

A well-known example of a longitudinal wave is a sound wave moving through air.

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The horizontal and vertical component of the velocity of the plane is 50(√3) mph and 50mph.

Velocity is defined as the ratio of displacement and time and the unit of velocity is m/s. The velocity is the vector quantity. The horizontal and vertical component is given as:

Horizontal component (x) = V cosθ

Vertical component(y) = V sinθ

From the given:

velocity fo the plane = 100mph

angle (θ) = 30°

The horizontal component (x) = V cosθ = 100×cos(30°) = 100 × √3/2

                                             = 50 √3

The vertical component (y) = V sin(θ) = 100×sin(30°) = 100×1/2

                                                  = 50

Thus, the horizontal and vertical components of the plane are (50√3,50) mph.

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At 30°C, the rms speed of a sample of oxygen with a molar mass of 16 g/mol is approximately 482.34 m/s.

The root mean square (rms) speed of a gas molecule is a measure of the average speed of the gas particles in a sample. It can be calculated using the formula:

vrms = √(3kT/m)

Where:

vrms is the rms speed

k is the Boltzmann constant (1.38 x 10^-23 J/K)

T is the temperature in Kelvin

m is the molar mass of the gas in kilograms

To calculate the rms speed of oxygen at 30°C (303 Kelvin) with a molar mass of 16 g/mol, we need to convert the molar mass to kilograms by dividing it by 1000:

m = 16 g/mol = 0.016 kg/mol

Substituting the values into the formula, we have:

vrms = √((3 * 1.38 x 10^-23 J/K * 303 K) / (0.016 kg/mol))

Calculating this expression yields the rms speed of the oxygen sample:

vrms ≈ 482.34 m/s

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Answer: 0.25A

Explanation: To calculate the current in the circuit, we can use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R):

I = V / R

In this case, the total resistance of the circuit is the sum of the individual resistances of the three bulbs in series, which gives us:

R = 2 + 2 + 2 = 6 ohms

The voltage of the battery is given as 1.5V.

So, using Ohm's Law, we can calculate the current in the circuit as:

I = V / R = 1.5 / 6 = 0.25 amps

Therefore, the current in the circuit is 0.25 amps.

The current in the circuit is 0.25 A.

Voltage across the circuit, v = 1.5 V

Resistance in each resistors, R = 2Ω

Since, the resistors are connected in series combination, their effective resistance,

R' = 3R

R' = 3 x 2

R' = 6Ω

According to Ohm's law, if the temperature and all other physical factors remain constant, the voltage across a conductor is directly proportional to the current that is flowing through it.

So, according to Ohm's law,

V = IR

Therefore, current flowing through the given circuit,

I = V/R

I = 1.5/6
I = 0.25 A

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Answer:

convection currents

Explanation:

The circuit shown above contains two resistors, Rį and R2, and a battery. A student is asked about the reading on a voltmeter connected between points A and B. The correct statement that the student could make along with a correct justification is E. The reading on the voltmeter is the same as the voltage across R1. Since points A and B are on opposite sides of R1, the potential difference across Rį and points A and B must be equal in magnitude.

To determine the reading on the voltmeter, we need to first analyze the circuit. According to Kirchhoff’s second law (KVL), the sum of the potential differences around a closed loop in a circuit must be zero. In the given circuit, if we move from point A to B, we can see that the potential difference is given by:

VAB = VR1 + VR2 + VB – VA ……(1)

Since the battery is the only source of potential difference in the circuit, we can say that VA = VB.

Therefore, equation (1) becomes,VAB = VR1 + VR2 ……(2)

According to Ohm’s law, the potential difference across a resistor is given by the product of the current flowing through it and its resistance. In the given circuit, the current flowing through R1 is the same as the current flowing through the voltmeter. Therefore, the potential difference across R1 is equal to the potential difference across the voltmeter, and the reading on the voltmeter is the same as the voltage across R1. Therefore, option E is correct.

The Question was Incomplete, Find the full content below :

The circuit shown above contains two resistors, Rį and R2, and a battery. A student is asked about the reading on a voltmeter connected between points A and B. Which of the following is a correct statement that the student could make, along with a correct justification?

A. The reading on the voltmeter is the same as the voltage of the battery. The definition of voltage is energy per unit charge, and the battery provides energy to each unit of charge leaving the battery.

B. The reading on the voltmeter is the same as the voltage across R1. The current in the voltmeter will be the same as the current in Rį, and Ohm's law says that the voltage must therefore also be the B same.

C. The reading on the voltmeter is zero. Since the circuit is open between points A and B, Ohm's law says that the voltage between points A and B must be zero since the current between the points is zero.

D. The reading on the voltmeter is zero. Ohm's law says that since the resistance between A and B is zero, the voltage between A and B must also be zero.

E. The reading on the voltmeter is the same as the voltage across R1. Since points A and B are on opposite sides of R1, the potential difference across Rį and points A and B must be equal in magnitude.

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The image distance is 0.65 cm and the image is real but diminished.

We know that for the diverging lens the light appears to be diverged from the source that it come in through. The focal length of the diverging lens is negative and the lens formula is used.

We have;

1/f = 1/u + 1/v

f = focal length

u = object distance

v = image distance

-1/2.5 = 1/4 + 1/v

1/v = 1/4 + 1/2.5

v = 0.25 + 0.4

v = 0.65 cm

The image is real but it is smaller than the object.

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Answer:

A

Explanation:

One of the main benefits of informational interviewing is that it allows the person conducting the interviews to gain insights and information about a particular career or industry.

Based on the information provided in the second paragraph of "On a Mountain Trail," the correct option would be "The pack surrounding the sleigh is a very real threat to the two men on the trail." The correct option is C.

In the second paragraph, it is mentioned that the wolves had stopped running and were now "moving at a dogtrot, leisurely and methodically encircling the sleigh." This description implies that the wolves are actively surrounding the sleigh, which suggests a potential threat to the two men on the trail. The word "encircling" indicates a deliberate and coordinated action by the wolves, which implies predatory behavior.

Now let's examine why the other options are not true:

A. The surrounding pack should not be concerning to the two men.

This option is not true because the description in the paragraph clearly implies that the pack of wolves surrounding the sleigh is a cause for concern.

B. The wolves will eventually tire and will return to the safety of the underbrush.

This option is not supported by the information provided in the paragraph. There is no mention of the wolves becoming tired or retreating to the safety of the underbrush. The description implies that the wolves are actively encircling the sleigh, indicating an ongoing threat.

D. Once a sleigh is surrounded by a pack of wolves, there is no chance for human survival.

This option is an extreme statement and goes beyond the information provided in the paragraph. The paragraph does not provide any conclusive information about the chances of human survival in such a situation. It simply describes the current state of the wolves surrounding the sleigh, but it does not make a definitive statement about the outcome for the two men.

Therefore, The correct option is C.

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The earthquake would occur 13 minutes before 10:05 a.m. which will be at 9.52 am.

The p-waves travel with a constant velocity of 7 km/s

The time can be calculated by using the formula

t = d / v

where

T1 =  10:05 a.m

d is the distance they take to travel from the epicenter

v is the speed of the p-waves

On average, the speed of p-waves is

v = 7 km/s

d = 5600 km (given)

Substituting the values in the formula;

t = d / v

t = 5600 ÷ 7

t = 800 seconds

Converting into minutes,

t = 800 ÷ 60

t = 13.3

≈ 13 mins

T1 -  13 mins = T2

10:05 - 13 mins = 9.52 am

It means the earthquake occurred prior 13 minutes, that is at 9.52 am.

Therefore, the earthquake occurred at 9.52 am.

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Answer:

Transcendentalism was greatly influenced by various philosophical and religious ideas, including:

German Idealism: Transcendentalism was heavily influenced by the works of German philosophers such as Immanuel Kant and Friedrich Schelling, who stressed the importance of the individual and the power of the human mind to comprehend the world.

Romanticism: Transcendentalists also drew on the ideas of the Romantic movement, which emphasized the importance of emotion, intuition, and imagination in the human experience.

American Romanticism: Transcendentalism was a product of the American Romantic movement, which rejected the materialism and commercialism of American society in the 19th century and sought to elevate the individual, nature, and spiritual experience.

Eastern philosophy and religion: Transcendentalists were influenced by the teachings of Hinduism and Buddhism, particularly the concept of transcendence, which emphasizes the individual's ability to transcend the limitations of the material world and connect with a higher spiritual reality.

Overall, transcendentalism was shaped by a diverse range of ideas and thinkers, reflecting its emphasis on individualism, intuition, and spiritual experience.

Explanation:

a boy walks at 2m/s for 30sec and run at 5m/s for 20sec. what is his average speed