What event happens about once every month? A. a revolution of the Earth around the Sun B. a rotation of the Earth C. a full Moon D. a lunar eclipse

Answer:

ΔU = -70 J

Explanation:

ΔU = Q − W

where ΔU is the change in internal energy,

Q is the heat absorbed by the system,

and W is the work done by the system (on the surroundings).

30 J of thermal energy is released, so Q = -30 J.

40 J of work is done by the system, so W = 40 J.

Therefore, the change in internal energy is:

ΔU = -30 J − 40 J

ΔU = -70 J

Final answer:

The change in internal energy of the system is calculated using the formula
ΔU = Q - W. With 30 J of thermal energy released and 40 J of work done by the system, the internal energy decreases by 70 J.

Explanation:

Change in Internal Energy Calculation

To calculate the change in internal energy (ΔU) of a system, the first law of thermodynamics is often used, which is expressed as ΔU = Q - W, where Q is the heat added to the system, and W is the work done by the system on its surroundings. In this scenario, Q is a negative value since 30 J of thermal energy is released (or removed) from the system, which makes Q = -30 J. The system does 40 J of work on the surroundings; hence, W is also 40 J.

The change in internal energy is therefore calculated as follows:

ΔU = Q - W
ΔU = (-30 J) - (40 J)
ΔU = -30 J - 40 J
ΔU = -70 J

Thus, the change in internal energy of the system is -70 J, indicating that the internal energy of the system has decreased by 70 joules.

Answer:

B goes up faster

if x=0, then A=0

if x=1 then B=6

Explanation:

Formulas Or Equations

We have two different formulas

A = 3x

B = 5x + 1.

They both are equations of lines. The number beside the X (coefficient) is also known as the slope of the line. The greater the slope, the faster the function goes up as X increases. We can clearly see that the equation B has a greater slope, which means it goes up faster than A as X increases

When x=0, A=3(0)=0

When x=1, B=5(1)+1=6

Answer:

10520 N

Explanation:

m = 1,052 kg

g = 10 m/s²

F = W = mg

F = 1052 × 10

F = 10520 N

The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity,

w = mg.

Since the weight is a force, its SI unit is the

newton.

For an object in free fall, so that gravity is the only force acting on it, then the expression for weight follows from Newton's second law: F = ma

Answer:

It will have a certain kinetic energy at the beginning, but it will be lost by resistant work done by friction. Thus, itsmotion wil be uniformly decelerating.

Explanation:

Answer:

3seconds

Explanation:

it will take 3 seconds

Answer:

radiation

Explanation:

Answer:

2.9 m/s to the right

Explanation:

Momentum before = momentum after

m₁ u₁ + m₂ u₂ = (m₁ + m₂) v

(0.50 kg) (5.7 m/s) + (0.50 kg) (0 m/s) = (0.50 kg + 0.50 kg) v

v = 2.85 m/s

Rounded to two significant figures, the velocity is 2.9 m/s to the right.

Due to rising demand for higher bandwidth and faster speed connections, fiber optic transmission is becoming more and more common in the developing world. Optical fiber has had a great impact on the way we receive and transmit signals. They have largely replaced copper wire communications in core networks in the developed world, because of its advantages over electrical transmission. But they brought some difficulties as well.

Following are the advantages and disadvantages of optical fiber:

Advantages

Disadvantages

Keywords: fiber optics, bandwidth, transmission, impact, advantages, disadvantages

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Explanation:

Average acceleration is defined as the rate of change of velocity to the rate of change of period. Change of velocity refers to the difference between final velocity and initial velocity. The unit of acceleration is meter/sec/sec (or)   m s^2.

Avg Acceleration=(Final velocity - Initial velocity) /(Final time - Initial time)

a. To find the average acceleration of the car, (initial velocity and initial time   is 0, the final velocity is 28 m/s, final time = 20 s)

               Avg acceleration of the car = (28 - 0) / (20 - 0)

                                                              = 28 / 20 = 1.4 m / s^2.

b. The distance traveled is given by the product of speed and time

     Distance traveled = Speed * Time

      The Distance traveled by the car = 28 * 20 = 560 m.

By applying basic physics formulas, the car's average acceleration can be determined as 1.4 m/s², and the distance it travels in 20 seconds is 280 meters.

To answer this question, you'll need to apply basic physics formulas. Let's go step by step:

a) What is the average acceleration of the car?

Acceleration is defined as the rate of change of velocity per unit of time. The formula is Acceleration = (Final speed - Initial speed) / Time. Here, the initial speed is 0 (because the car is starting from rest), final speed is 28 m/s and time is 20 s.

So, Acceleration = (28 m/s - 0) / 20 s = 1.4 m/s². That's your answer for part a.

b) What distance does it travel in this time?

The distance traveled by the car can be found using the formula of linear motion: Distance = Initial speed x Time + 0.5 x Acceleration x Time². Since the car starts from rest, the initial speed is zero, and this component of the formula will be zero.

So, Distance = 0 + 0.5 x 1.4 m/s² x (20 s)² = 280 m. So, the car travels 280 meters in that time.

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Answer:

55 m/s

Explanation:

If all kinetic energy is converted to heat:

½ mv² = mCΔT

v = √(2CΔT)

v = √(2 × 128 J/kg/K × (36.9°C − 25°C))

v = 55.2 m/s

Rounded to two significant figures, the speed is 55 m/s.

The correct answer is; Yes, you can be unconsciously eavesdropping.

Further Explanation:

When this occurs it is called the “The Cocktail Party Phenomenon.” Your mind can focus on one conversation that is being made and drown out all other speech and things going on around you. This makes your brain have auditory attention on one specific conversation.

The sensory hearing in the person listening to the conversation is subconsciously filtering the conversation into its own stream in the brain. This phenomenon can also detect certain words that are important to the person with a large amount of noise in the background.

This occurs in the left hemisphere of the brain in the superior temporal gyrus region.

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Final answer:

The experience you described is related to the cocktail party effect, a part of selective attention that allows us to focus on a conversation even in a noisy environment, while still unconsciously monitoring other auditory channels, including hearing one's own name.

Explanation:

Cocktail Party Phenomenon and Selective Attention

The situation you described typically relates to the cocktail party effect, which is a well-documented phenomenon in psychology. This effect explains how people can focus on a specific conversation in a noisy environment yet still notice when something salient, like their name, is mentioned elsewhere. It's a part of selective attention, allowing us to concentrate on a single source of input while still unconsciously monitoring other channels. The information overload at events such as parties necessitates this filtering mechanism, where our brains process background conversations without our active awareness. When your name is mentioned, it becomes a significant stimulus that captures your attention, indicating that some unconscious eavesdropping may occur as a byproduct of this natural cognitive process.

As mentioned by Broadbent (1958) and Cherry (1953), selective attention is not a complete exclusion of all background noise; it's a delicate balance that allows for focus while still keeping us connected to our surroundings. This phenomenon shows that even when you're engaged in conversation, you're unconsciously monitoring the environment around you, including the speech of others. Your brain is attending to more than you might realize, as it sifts through various sensory inputs to alert you to anything important—like the mention of your name.

The problem involves using the principles of conservation of angular momentum and kinetic energy to find the student's final angular speed and the change in kinetic energy of the system when the radius at which weights are held is changed.

The problem involves calculating the final angular speed of a student who pulls two objects closer while rotating on a stool and then determining the change in kinetic energy of the system. Using the principle of conservation of angular momentum, we can solve for the student's final angular speed after changing the radius at which the objects are held. The kinetic energy change relies on calculating the initial and final kinetic energies and finding their difference.

Without the complete calculations for this scenario, a precise final angular speed and kinetic energy change cannot be provided here. Typically, you would use the formula for angular momentum (L = Iω) where I is the moment of inertia and ω is the angular speed, and the formula for kinetic energy (KE = 0.5 * I * ω²) to solve these problems.

Answer:

The answer is c

Explanation:

Answer:

1.48 kg

Explanation:

The conservation of energy states that energy cannot be created or destroyed but can be converted from one form to another. Hence, in this case, energy lost by the copper should equal to the energy gained by the lead. Hence,

Energy Lost by Copper = Energy Gained by Lead

mcT = mcT (Bolded is for copper, italicised is for lead)

m(387)(88.4 - 55.9) = (3.50)(128)(55.9 - 14.4)

12577.5m = 18592

             m = 1.48 kg (3 sf)

(Note: Thermal energy can be calculated using Q = mcT where m is the mass, c is the specific heat capacity and T is the change in temperature)

Answer:

1.48 kg

Explanation:

Answer:

A

Explanation: This isn't Physics, but there's your answer.

Answer:

Heterogeneous Mixture

Explanation:

Heterogeneous by definition is when two different substance are mixed together, but they are not evenly distributed. In this case, the salad dressing is a Heterogeneous Mixture, for the dressing does not mix completely evenly throughout the salad.

~

The IMA of the lever is 10

Explanation:

The IMA (Ideal Mechanical Advantage) of a simple machine is given by:

[tex]IMA=\frac{d_e}{d_r}[/tex]

where

[tex]d_r[/tex] is the length of the resistance arm

[tex]d_e[/tex] is the length of the effort arm

For the lever in this problem, we have:

[tex]d_r = 7 cm = 0.07 m[/tex] is the length of the resistance arm

[tex]d_e = 0.7 m[/tex] is the length of the effort arm

Substituting into the equation, we find the IMA of the lever:

[tex]IMA=\frac{0.7}{0.07}=10[/tex]

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Answer:

1st blank - amplitude

2nd blank - frequency

3rd blank - hertz

The amount of energy a wave carries corresponds to its amplitude. Frequency is equal to the number of wavelengths that pass a fixed point in a second. Frequency is typically expressed in hertz

The acceleration of the car is 1.067 m/[tex]s^{2}[/tex].

Explanation:

Acceleration is the measure of change in velocity experienced by any object for a given time period. So it is determined as the ratio of difference in the velocity to the time period.

As here the initial velocity is stated as zero, so u = 0. And the final velocity is termed as 50 km/h. Then we have to determine the acceleration in 13 s. So here we have to convert the units as common units. Thus, 50 km/h should be converted to m/s as [tex]\frac{50*1000}{3600}=13.88 m/s[/tex]

So now, the initial velocity u = 0 and final velocity v = 13.88 m/s and the time period is given as t = 13 s.

[tex]Acceleration = \frac{v-u}{t}=\frac{13.88-0}{13}=1.067 m/s^{2}[/tex]

So the acceleration of the car is 1.067 m/[tex]s^{2}[/tex].

Answer:

musical intelligence

Explanation:

False: a line on a speed-time graph with a steep slope indicates a greater acceleration

Explanation:

In a speed-time graph, we have:

This means that the slope of this graph is

[tex]m=\frac{\Delta y}{\Delta x}=\frac{\Delta v}{\Delta t}[/tex]

where

[tex]\Delta v[/tex] is the change in speed

[tex]\Delta t[/tex] is the change in time

However, acceleration is defined as

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

where [tex]\Delta v[/tex] is the change in velocity. If we consider a motion in a straight line, the change in velocity corresponds to the change in speed: therefore, the slope of a speed-time graph corresponds (for a straight line motion) to the acceleration.

Therefore, the steeper the slope, the greater the acceleration of the body.

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The number of revolutions the tire makes during this motion is 169.265 revolution.

Explanation:

Given:

Car’s initial velocity, u = 0

Car’s final velocity, v = 33.5 m/s

Time required t = 11.9 s

Hence, car’s acceleration ‘a’ can be given by the first equation of motion as

[tex]v=u+(a \times t)[/tex]

[tex]33.5=0+(a \times 11.9)[/tex]

[tex]11.9 \times a=33.5[/tex]

[tex]a=\frac{33.5}{11.9}=2.815 \mathrm{m} / \mathrm{s}^{2}[/tex]

The distance covered by the car during this time is given by the second equation of motion

[tex]s=(u \times t)+\left(\frac{1}{2} \times a \times t^{2}\right)[/tex]

[tex]s=0+\left(0.5 \times 2.815 \times 11.9^{2}\right)[/tex]

[tex]s=0.5 \times 2.815 \times 141.61=199.31 m[/tex]

Now as in each revolution a wheel rolling without slipping covers a distance equal to its periphery ([tex]2 \pi R[/tex]), if the total numbers of revolution of each tire be n, then we have

[tex]s=n \times 2 \pi R[/tex]

Given diameter, d = 37.5 cm = 0.375 m

Radius of the wheel, R =  [tex]\frac{d}{2}=\frac{0.375}{2}=0.1875 \mathrm{m}[/tex]

Total numbers of revolution,

[tex]n=\frac{s}{2 \pi R}=\frac{199.31}{2 \times 3.14 \times 0.1875}=\frac{199.31}{1.1775}=169.265 \text { revolution }[/tex]

The car's tires make approximately 917 revolutions during the motion.

To find the number of revolutions the tire makes during this motion, we need to first find the distance the car travels. We can use the formula s =[tex]ut + 1/2at^2[/tex]the distance, u is the initial velocity, a is the acceleration, and t is the time. In this case, the initial velocity is 0 m/s, the acceleration is the same as the car's acceleration, and the time is 11.9 s. Plugging in these values, we get:

s = 0(11.9) + 1[tex]/2(33.5)(11.9)^2[/tex]

The distance traveled is equal to the circumference of the tire multiplied by the number of revolutions. The circumference of the tire is equal to π times the diameter. Plugging in the values, we get:

2π(0.375) = 2.35619 m

Let's assume the number of revolutions is N. Therefore, the distance traveled can also be calculated as N times the circumference. Setting up the equation, we have:

N(2.35619) = 2156.29

Solving for N, we get:

N = 2156.29 / 2.35619 = 916.67

Therefore, the tire makes approximately 917 revolutions during this motion.

For calculating work, the force and the distance must be in the same direction

Explanation:

The work done by a force on an object is given by the equation

[tex]W=Fd cos \theta[/tex]

where

F is the magnitude of the force

d is the displacement

[tex]\theta[/tex] is the angle between the direction of the force and of the displacement

The equation can be rewritten as

[tex]W=(F cos \theta) d[/tex]

where [tex]F cos \theta[/tex] is the component of the force parallel to the displacement of the object. This means that when calculating the work, only the component of the force parallel to the motion of the object contributes to the work: in this sense, we can say then for work to be different from zero, the force must have a component in the same direction as the motion of the object.

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Answer:

Direction

Explanation:

Answer:

Proton and electron

Explanation:

An atom can be broken down into three constituents parts – protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge, electrons having a negative charge, and neutrons possessing no net charge

Answer:

variable that scientist change

Explanation:

a) Change in momentum: -300 kg m/s

b) Force felt by the jumper: -300 N

Explanation:

a)

The change in momentum of an object is given by

[tex]\Delta p = m(v-u)[/tex]

where

m is the mass of the object

v is the final velocity

u is the initial velocity

For the jumper in this problem, we have

m = 60 kg (mass of the jumper)

v = 0 (final velocity is zero)

u = 5.0 m/s (initial velocity before he hits the mat)

Substituting,

[tex]\Delta p = (60)(0-5.0)=-300 kg m/s[/tex]

Where the negative sign means that the direction of the change in momentum is opposite to the direction of motion.

b)

According to the impulse theorem, the change in momentum of an object is equal to the impulse exerted on it:

[tex]\Delta p = F\Delta t[/tex]

where

F is the force exerted on the object

[tex]\Delta t[/tex] is the time interval

In this problem, we have

[tex]\Delta p = -300 kg m/s[/tex] (change in momentum)

[tex]\Delta t = 1 s[/tex] (duration of the  collision)

Solving for F,

[tex]F=\frac{\Delta p}{\Delta t}=\frac{-300}{1}=-300 N[/tex]

Where the negative sign means that the direction of the force is opposite to the direction of motion.

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The gain in gravitational potential energy of the mass = 100 kg m^2 / s^2.

Explanation:

Gravitational potential energy is an energy in which an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the Earth's surface where the gravitational acceleration can be assumed to be constant at about 9.8 m/s2.

The formula for the gravitational potential energy is the product of mass, gravity, and height.

             GPE = m *g *h

where m represents mass in kg,

           g represents the gravity,

           h represents the height.

          GPE    = 5 * 10 * 2 = 100 kg m^2 / s^2.