Martha, a first-grade teacher, is worried that if doesn't stay In at work to grade papers her principal will think she is lazy She is also worried that if she stays late at work her partner will be angry. This of conflict is known as

If the energy input to an electric motor is 560J/s and 170J/s of energy is transferred to thermal energy when in use, the efficiency of the motor would be

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

As given in the problem If the energy input to an electric motor is 560J/s and 170J/s of energy is transferred to thermal energy when in use,

Useful energy = electrical energy - thermal energy lost

                        =560 J/s - 170 J/s

                        = 390 J/s

the efficiency of the motor = useful energy /electrical energy ×100

                                            = 390/560 ×100

                                            =69.64%

Thus, the efficiency of the motor would be 69.64%.

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Answer:

29.4J

Explanation:

gravitational potential energy=mgh

mass is 15

g=9.8

h=2m

15*9.8*2=29.4

It takes package A 1.10 seconds to reach the bottom of the ramp.

To solve this problem, we can use the equations of motion for an object sliding down an inclined plane.

First, we need to find the net force acting on each package as they slide down the ramp. The net force is the force of gravity minus the force of friction:

For package A:

Net force = (5.50 kg)(9.81 m/\(s^2\)) sin(20°) - (0.210)(5.50 kg)(9.81 m/\(s^2\)) cos(20°)

Net force = 30.67 N

For package B:

Net force = (11.5 kg)(9.81 m/\(s^2\)) sin(20°) - (0.160)(11.5 kg)(9.81 m/\(s^2\)) cos(20°)

Net force = 57.53 N

Next, we can use the equation of motion for an object sliding down an inclined plane to find the acceleration of each package:

a = Net force / mass

For package A:

a = 30.67 N / 5.50 kg

a = 5.58 m/s^2

For package B:

a = 57.53 N / 11.5 kg

a = 5.00 \(m/s^2\)

Now, we can use the equation of motion for constant acceleration to find the time it takes for package A to reach the bottom of the ramp:

d = (1/2)\(at^2\)

where d is the distance traveled (which we can assume is the length of the ramp), a is the acceleration, and t is the time.

Solving for t, we get:

t = sqrt(2d / a)

Plugging in the values for package A, we get:

t = sqrt(2(5.00 m) / 5.58 \(m/s^2\))

t = 1.10 s

Therefore, it takes package A 1.10 seconds to reach the bottom of the ramp.

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A force of 80 newtons is applied to the combined masses.acceleration of the system is =40/3 or 13.33 metre/sec².

acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing.

acceleration of object A= FORCE APPLIED ÷ MASS OF A

                                                               =80÷ mass of A

                       mass of A = 80÷ acc of object A

                        mass of A= 80÷20=4kg

                         mass of A = 4kg

acc of object B = force applied ÷ mass of B

 mass of object B =force applied ÷ acc of object B

 mass of object B=80÷40=2kg

mass of object B =2Kg

when same force is applied to the combined system of 4kg and 2kg then acceleration of the combined mass is = force applied ÷ total mass

=80÷[4+2]

=80÷6

=40÷3

=13.333 metre/sec²  

acc of the combined system is 13.333 metre/sec²

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9.8 x \(10^{26}\) photons of 450 nm light to satisfy the daily requirement for 12 kWh of energy, assuming a conversion efficiency of 10%.

To solve this problem, we need to know the energy of a single photon with a wavelength of 450 nm. We can use the following equation to find the energy

E = hc/λ

Where E is the energy of a single photon, h is Planck's constant (6.626 x \(10^{-34}\) J s), c is the speed of light (2.998 x \(10^{8}\) m/s), and λ is the wavelength of the light in meters.

Plugging in the values, we get

E = (6.626 x \(10^{-34}\) J s)(2.998 x \(10^{8}\) m/s)/(450 x \(10^{-9}\) m)

E = 4.41 x \(10^{-19}\) J

Now we can find the number of photons required to satisfy the daily requirement for 12 kWh of energy. First, we need to convert the energy from kWh to joules

12 kWh = 12 x \(10^{3}\) Wh x 3600 s/h = 4.32 x \(10^{7}\) J

Since the conversion efficiency is only 10%, we need to multiply the required energy by 10 to get the total energy needed

4.32 x \(10^{7}\) J x 10 = 4.32 x \(10^{8}\) J

Finally, we can use the following equation to find the number of photons

Number of photons = total energy/energy per photon

Number of photons = 4.32 x \(10^{8}\) J/4.41 x \(10^{-19}\) J = 9.8 x \(10^{26}\) photons

Therefore, we would need approximately 9.8 x \(10^{26}\) photons of 450 nm light to satisfy the daily requirement for 12 kWh of energy, assuming a conversion efficiency of 10%.

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Answer:

(A.) The magnetic field pushes negative charges and positive charges in opposite directions.

Explanation:

hope this helps:)

Electric charges that move through a magnetic field produce an electric current because, the magnetic field pushes negative charges and positive charges in opposite directions.

Some domains in magnetized materials will cancel, but the majority of the domains will be oriented in one direction, creating a net magnetic field. Because the domains in unmagnetized materials are randomly orientated and cancel, no visible field is produced.

A current will be induced in a coil of wire if it is exposed to a shifting magnetic field. Because of an electric field that is being generated, which drives the charges to move around the wire, current is flowing.

Even though it is not a force, this is referred to as an electromotive force, or emf. EMF, on the other hand, resembles the voltage offered by a battery. Therefore, a changing magnetic field across a wire coil must result in an emf, which in turn causes current to flow. Hence, option A is correct.

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It will be very difficult to if you could travel back to the time when the Earth first formed as a planet.

When Earth first formed as a planet, the surface would be extremely hostile and inhospitable and life won't be possible. It was just molten volcanic land with no water or ocean.

Atmosphere and life were also not formed at that time. During the first period of time the temperature of Earth's atmosphere was extremely high and collisions were continuously happening between celestial bodies.

The heat produced in the atmosphere  thus was in a state of molten volcanic state. Just magma and lava. High temperature prevented the formation of oceans and thus life also.

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The approximate difference in volumes of the youth and adult softballs is 6.3 cubic inches.

To find the volumes of the two spheres, we need to use the formula for sphere volume, which is V = (4/3)πr^3. We are given the diameters of the youth and adult softballs, so we can find their radii by dividing by 2. Thus, the radius of the youth softball is 1.75 inches, and the radius of the adult softball is 1.9 inches.

Plugging these values into the formula, we get V(youth) ≈ 22.8 cubic inches and V(adult) ≈ 29.1 cubic inches. The difference in volumes is then V(adult) - V(youth) ≈ 6.3 cubic inches, which is our final answer rounded to the nearest tenth. Therefore, the approximate difference in volumes of the youth and adult softballs is 6.3 cubic inches.

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Answer:

R = -2500N

Explanation:

Use formula ΣF = Ma. We can split the Net Force into two parts: Fe - Ff  =  Ma.

Fe is the force developed by the engine: 4000N

Ff (R) is the air resistance projected on the vehicle. This is the value we're looking for.

Mass: 1000kg

Acceleration: 1.5m/s^2

Next, just plug in the values and solve.

▪4000N - Ff  =  (1000kg)(1.5m/s^2)

▪Ff = 1500N - 4000N

▪Ff = -2500N

R = -2500N.

The air resistance acting on the car is R = -2500N.

Answer:

Physical change is a temporary change. A chemical change is a permanent change

examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

HAVE A GREAT DAY :)

Answer:

/////////////////////////////////////////////////

Explanation:

The mass of an atom that have six protons; six neutrons; and six electron is 12. The mass of an atom is the total of its protons and neutron

Atom is the smallest structure of the chemical element. Atom contain protons, neutrons and electrons. Protons is a subatomic that contains positive electric charge where the electrons is a subatomic that contains negative electric charge or the opposite of the protons. Neutrons is a subatomic that contain no electric charge. The mass number of an atom is formulated as mass number = protons + neutrons. Hence:

mass number = protons + neutrons.

mass number = 6 + 6

mass number = 12

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Both of the bullets will hit the ground at the same time.

If we ignore any kind of air resistance and assume the surface of earth to be completely flat.

Let us first analyze the motion of the dropped bullet,

The initial velocity U is zero, if the height is h, and the acceleration is only because of gravity so it is g, then the time t is,

We can write,

H = ut + 1/2gt²

H = 1/2at²

t = √(2H/g)

Now, let us assume that the bullet is fired with some initial velocity u,

We have to notice that the velocity here is completely in the horizontal direction, so, analyzing the vertical motion,

We can write,

H = ut+1/2gt²

There is no initial velocity in vertical direction,

t = √(2H/g)

So, the time to hit the ground is same in both the cases.

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Astronomers know that pulsating variable stars are actually expanding and contracting in diameter with the help of the Doppler effects of light waves.

The Doppler effect is a phenomenon that occurs when two objects move closer or farther apart, increasing (or decreasing) the frequency of sound, light, or other waves.

The Doppler effect is applicable to sound waves as well as light waves,

Thus, the Doppler effect on sound may be compared to the color of light waves, which helps astronomers to know about pulsating variable stars actually expanding and contracting in diameter.

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Answer:

Summary notes really help and make sure to revise on past papers.Good luck

Explanation:

Give me a like if this helped

A spring-mounted chair in which the astronaut sits, can be used to find the mass of an astronaut. The chair is then made to oscillate in simple harmonic motion. The spring used in one such device has a spring constant of 605 n/m, and the mass of the chair is 11 kg. the measured oscillation period is 3.2 s. Thus, the mass of the astronaut is M = 145 kg.

The Angular velocity can be defined as the ratio of angle to the time.

angular velocity = angle/time

In the resolution of the harmonic oscillator movement of a system and a mass with a spring, the angular velocity is

w = √ k / m

Where k is the spring constant and m the mass

In this case the mass is the mass of the chair (m) plus the mass of the astronaut (M)

M all = m + M

The angular velocity and the period are related by

w = 2π / T

Substituting

2π / T = √(k/(m + M))

We calculate the astronaut's mass

4π² / T² = k / (m + M)

M = k T² / 4π² - m

M = 605 × 3.2² /(4π²) - 11

M = 156.92- 11

M = 145.92 kg

Thus, the mass of the astronaut is 145 Kg.

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To develop a sampling plan for LSI circuit chips, an electronics firm should consider the AQL (Acceptable Quality Level) of 0.15 specified by the LSI manufacturing department and the LTPD (Lot Tolerance Percent Defective) of 0.40 acceptable by the assembly department.

The sampling plan should involve selecting a representative sample of LSI circuit chips from the manufacturing department and conducting tests to determine their quality. The AQL of 0.15 means that the manufacturing department will tolerate no more than 15% defective chips in a given sample. Therefore, the sampling plan should ensure that the sample size is large enough to provide statistical confidence in determining the quality level of the chips.

The assembly department's LTPD of 0.40 indicates the maximum allowable defective rate for the chips after assembly. This implies that the sampling plan needs to consider the overall quality of the chips and their performance in the final analog devices.

To execute the sampling plan, one could follow these steps:

1. Determine the appropriate sample size based on statistical calculations, taking into account the desired confidence level and the acceptable quality levels specified by both departments.

2. Randomly select the required number of LSI circuit chips from the manufacturing department.

3. Perform thorough testing and inspection on the selected chips to identify any defects or anomalies.

4. Calculate the defect rate based on the number of defective chips found in the sample.

5. Compare the defect rate with the specified AQL and LTPD to assess if the chips meet the required quality standards.

6. Provide feedback to the manufacturing and assembly departments based on the results, taking necessary actions if the quality standards are not met.

By following this sampling plan, the electronics firm can ensure that the LSI circuit chips meet the required quality standards and are suitable for use in analog devices.

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Explanation:

can you show me the answer of science

Answer:

The distance between two successive crests of a wave is one way to define its wavelength, so

λ

=

1.15

m

.

The frequency of a wave is the number of waves passing a given point per second, so

f

=

20

16.2

=

1.23

Hz

.

The speed of a wave is given* as

v

=

λ

f

, so here

v

=

1.15

⋅

1.23

=

1.42

m/s

~~~~

*This is because the wavelength is the "distance per wave" and the frequency is the "number of waves per second," so multiplying the two gives "distance per second." This can be verified with dimensional analysis:

meters

wave

×

waves

second

=

meters

second

When a horse accelerates a sled to the right. all forces acting on the sled:

A free body diagram is a graphical representation used in physics and engineering to show the applied forces, moments, and consequent reactions on a body in a specific situation.

It shows a body or group of connected bodies along with all the applied forces, times, and reactions that the body experiences. The body could be compact or comprise several interior pieces.

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Yes, the sound wave with a frequency of 540 Hz will diffract while passing through an opening of 80 cm.

This is because the diffraction of a wave is directly proportional to the wavelength of the wave and inversely proportional to the size of the opening. As the wavelength of a sound wave with a frequency of 540 Hz is approximately 0.63 meters, which is much larger than the size of the opening, it will diffract around the edges of the opening.
Hi! A sound wave with a frequency of 540 Hz will indeed diffract while passing through an opening of 80 cm. The extent of diffraction depends on the wavelength of the sound wave and the size of the opening. In this case, the wavelength is longer compared to the size of the opening, which allows for significant diffraction to occur.

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Answer:

We found out more about how the universe had started (Big Bang theory), how the planets were created and how stars are born.

Answer:

The ball travels faster when Mike throws it.

Explanation:

Mike throws the ball harder, with a greater force, so the ball travels faster when Mike throws it than when Joe does.

Answer:

draw fuel from the tank and supply pressurized fuel to the engine.

The precautions and steps to be taken for voltage measurement of an unknown source are given below.

When taking a voltage measurement of an unknown source, the following steps should be taken:

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Answer:

it is 2236392000

Answer:

Classical physics viewed light as a wave.

Explanation:

because classical physics describes light as waves

Calculate the potential temperature of air at 50mb and 250 K using the formula: potential temperature = temperature * (Reference Pressure / Current Pressure)^(R/Cp).the potential temperature of the air at a pressure of 50mb and a temperature of 250 K is approximately 369.25 K.

To calculate the potential temperature of air at a pressure of 50mb and a temperature of 250 K, you can use the formula for potential temperature:

Potential temperature = Temperature * (Reference Pressure / Current Pressure)^(R/Cp)

In this case, the reference pressure is typically taken as 1000mb, the gas constant for dry air (R) is approximately 287 J/(kg·K), and the specific heat at constant pressure (Cp) is approximately 1005 J/(kg·K).

Plugging in the values, we get:

Potential temperature = 250 K * (1000 mb / 50 mb)^(287/1005)

Simplifying the calculation:

Potential temperature = 250 K * 20^(0.2856)

Using a calculator, we can find that 20^(0.2856) is approximately 1.477.

So, the potential temperature of the air is:

Potential temperature = 250 K * 1.477

Calculating this, we find that the potential temperature of the air is approximately 369.25 K.

Therefore, the potential temperature of the air at a pressure of 50mb and a temperature of 250 K is approximately 369.25 K.

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Answer:

There should be a certain age limit Idon't know

Explanation: