a loaf of bread is removed from an oven at350° f and cooled in a room whose temperature is70° f. ifthe bread cools to210° f in 20 minutes,how much longer will it take the bread to cool to140° f.

Impulse  = change in momentum = 0.045 * 36 = 1.62 kg m/sec and Average Force = Impulse / time  = 1.62 / 3.9 x 10^-3    = 415.3 Newton

Impulse forces are those that have a relatively brief duration of action. The term "impulse" refers to the result of the impulsive force and the time at which it acts. I = F dt = dM is the formula for the impulse, which is the change in momentum brought on by the impulsive force.

The momentum of an object will change when a force acts for a predetermined period of time. In other words, an uneven force always accelerates an object, either by making it go faster or slower. When a force opposes an object's motion, the object slows down. When a force is applied in the same direction as an object's motion, the object is accelerated by the force. In either case, a force will alter an object's velocity.

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Explanation:

Visible light is the range of electromagnetic waves that humans can see. Anything that glows or gives off light makes waves of what we call visible light. The sun, light bulbs, candles and fire are all things that people automatically think of when it comes to light, but visible light comes from many sources and in many colors. Some other sources of visible light include: television and computer screens, glow sticks, and fireworks

Answer:

Visible light is visible because most of the gases in planetary atmospheres (oxygen, nitrogen, carbon dioxide, methane, ammonia…) are transparent to those wavelengths. We evolved to see those wavelengths because the atmosphere in visible light is transparent.

Explanation:

The quantity of light energy emitted at 40W, in five minutes or 300 seconds will be 1200J.

Equation:

40 W total power

40 W = 40 J/s (joules per second)

10% efficiency

Efficiency x Power Equals Actual Power output

40x0.1 = 4W

Power x Time Equals Energy

300 s x 4 W = 1200 J

Energy of Light = 1200 J

Things like stars, lightbulbs, lasers, and hot objects all emit light energy. Light energy travels from stars like our Sun to the Earth. A natural source of light energy is the Sun.

The electromagnetic spectrum is much larger than the light we can see, which is made up of each hue in the rainbow. Other forms of light include those that are invisible to the human sight, such as radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays, and gamma rays.

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The composition of the solution in terms of mole fraction will simply be equal to the mole fraction of the volatile liquid.

It is given that the liquid a is volatile and b is non-volatile. Since the solute a is not volatile, the mole fraction of the solute is not to be taken into account for. Being non-volatile, the liquid aa will not be contributing to the partial pressure. Hence, the partial pressure will only depend on the mole fraction of b which is given to be volatile.

Therefore, here we will only have to consider the mole fraction of the volatile liquid b and not the involatile liquid a.

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The potential energy of the system changes as the second positive charge q is moved from point I to point f.

The potential energy increases, indicating that work is done to move the charge against the electric field created by the negative charge. The magnitude of the change in potential energy depends on the distance between the charges, the charge of the particles, and the initial and final positions of the positive charge.

The change in potential energy can be calculated using the equation: ∆U = kq1q2/r, where k is Coulomb's constant, q1 is the charge of the negative particle, q2 is the charge of the positive particle, and r is the distance between them.


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The point on the y-axis where the magnetic field is zero can be determined by applying Ampere's law, which states that the sum of the magnetic field contributions from currents passing through a closed loop is proportional to the total current passing through the loop.

In this case, we have two wires carrying currents in opposite directions. The magnetic field at a point on the y-axis due to each wire can be calculated using the formula:

B = (μ0 / 2π) * (I / r),

where B is the magnetic field, μ0 is the permeability of free space (4π × 10^(-7) T·m/A), I is the current, and r is the distance from the wire to the point of interest.

Let's consider a point on the y-axis at a distance y from the x-axis. The magnetic field contributions from the two wires can be calculated as follows:

B1 = (μ0 / 2π) * (i1 / r1) = (4π × 10^(-7) T·m/A / 2π) * (45 A / r1),

B2 = (μ0 / 2π) * (i2 / r2) = (4π × 10^(-7) T·m/A / 2π) * (35 A / r2),

where r1 is the distance between the first wire and the point on the y-axis, and r2 is the distance between the second wire and the same point on the y-axis.

To find the point on the y-axis where the magnetic field is zero, we set B1 + B2 = 0 and solve for y:

(4π × 10^(-7) T·m/A / 2π) * (45 A / r1) + (4π × 10^(-7) T·m/A / 2π) * (35 A / r2) = 0.

Simplifying the equation, we have:

(45 A / r1) + (35 A / r2) = 0.

From this equation, we can see that for the magnetic field to be zero, the sum of the magnetic field contributions from the two wires must cancel each other out. The specific value of y where this occurs depends on the values of r1 and r2, which are the distances from the wires to the point on the y-axis.

Given that y1 = 2 cm and y2 = 11 cm, we can calculate r1 and r2 as follows:

r1 = √((x^2 + y1^2)) = √((0^2 + 0.02^2)) ≈ 0.02 m,

r2 = √((x^2 + y2^2)) = √((0^2 + 0.11^2)) ≈ 0.11 m.

Now, substituting these values into the equation above, we have:

(45 A / 0.02 m) + (35 A / 0.11 m) = 0.

Simplifying further, we find:

2250 A/m + 318.18 A/m = 0,

2570.18 A/m = 0.

Since it is not possible for the sum of positive values to equal zero, there is no point on the y-axis where the magnetic field is exactly zero in this scenario.

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The Doppler method of discovering extrasolar planets, also known as the radial velocity method, primarily works best for high mass planets close to their host star. so, the correct option  is  D.

The Doppler method relies on detecting tiny wobbles in a star's motion caused by the gravitational pull of an orbiting planet. The gravitational interaction between the planet and its host star induces a slight shift in the star's spectrum, known as the Doppler effect. By measuring this shift, scientists can infer the presence of a planet.This method is most effective in detecting massive planets that are relatively close to their host star because the gravitational interaction between the two objects produces a more pronounced and detectable Doppler effect. Planets that are too far from their star or have low mass may not induce a significant enough motion in the star to be detected using this method. Therefore, the correct option is D .

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The correct terms that fills the box are;

(i) The incident ray

(ii) The normal

(iii) The reflected ray

(iv) The angle of incident

(v) The reflected angle

The terms of the ray diagram is illustrated as follows;

(i) This arrow indicates the incident ray, which is known as the incoming ray.

(ii) This arrow indicates the normal, a perpendicular line to the plane of incidence.

(iii) This arrow indicates the reflected ray; the out going arrow.

(iv) This the angle of incident or incident angle.

(v) This is the reflected angle or angle of reflection.

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1. A JFET can be used as a voltage-controlled resistor in the saturation region of its V-I characteristics where the JFET acts as a variable resistor for the applied voltage at the gate. The reason why the V-I characteristics are linear in that region is that the JFET channel is wide open to the current and the voltage applied across it,

thereby making the drain-source voltage proportional to the gate-source voltage. This effect causes the JFET channel to act as a voltage-controlled resistor. When the gate-source voltage is zero, the channel is open, and the JFET acts as a resistance, making it very low resistance for conduction. When a voltage is applied to the gate, it reduces the width of the channel and hence reduces the current flow through it, thereby increasing its resistance.

2. We have been given the following circuit diagram:The drain current, Id = 4mA and the gate voltage, \(Vg = -2V.Id = (Vp - Vgs)^2/2RdGiven, Vp = -10V; Rd = 1kΩSo,\) we can calculate the value of Vgs using the above formula as follows:4mA = (-10V - Vgs)^2/2(1kΩ)8mA x 1kΩ = (-10V - Vgs)^2-8V = -10V - VgsVgs = -10V + 8VVgs = -2VTherefore, the drain current, Id = 4mA and the gate voltage, Vg = -2V.

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Answer:

B and C

Explanation:

The least frictional surface is probably one with carpet floor. As a result, Alternative A is the right response.

PTFE polytetrafluoroethylene is frequently used for sliding applications because of its low coefficient of friction. The traditional bore and wear synthetic materials of polyimide, PEEK, Ps, nylon, acetal, and rayon are also well known for their excellent sliding friction capabilities in addition to PTFE.

For instance, ice rubbing against steel would result in less resistance than rubber rubbing against concrete. This is why wearing rubber shoes here on sidewalk prevents you from slipping, while ice skates glide so readily on the ice.

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The unit of measurement used for Electric Potential is Volt (V). Therefore, option e, V, is the correct answer.

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Answer:

The heat necessary to warm 500g of water from 20°C to 65°C is 37,620 J.

Explanation:

GIVEN: m = 500 gm, T₂ = 65°C AND T₁  = 20°C, we know that c (specific heat capacity) = 4180

TO FIND: The heat necessary to warm 500g of water from 20°C to 65°C.

SOLUTION:

By using the heat equation,

              Q=m c ΔT  

             ΔT = T₂ - T1

             ΔT = 65 - 20 = 45°C

In this case,

Q = 0.2 × 4180 × 45 = 37,620 J

Among the given options, entropy (D) is the correct answer, as it represents the tendency toward a disordered state in a system.

Entropy is the tendency toward a disordered state. In thermodynamics, entropy is a measure of the randomness or disorder of a system. As a system undergoes a spontaneous process or transformation, its entropy tends to increase, leading to a more disordered state.

Entropy is an important concept in understanding the behavior of systems in various fields such as chemistry, physics, and engineering. It is associated with the second law of thermodynamics, which states that in an isolated system, natural processes tend to increase the overall entropy. In other words, systems tend to move towards a state of greater disorder or randomness over time. Entropy is often related to energy distribution within a system, with high entropy indicating a more even distribution of energy and low entropy suggesting a more concentrated distribution

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Answer:

velocity of Trinity = 1m/s

Explanation:

Conservation of Momentum equation

m1u1+m2u2=m1v1+m2v2.

m1 = mass of penguin

u1 = initial velocity of penguin

v1 = final velocity of the penguin

m2 = mass of Trinity

u2 = initial velocity of Trinity

v2 = final velocity of trinity

5kg • 8m/s + 40kg • 0m/s = 5kg • 0m/s + 40kg • v2

40kg•m/s = 40kg • v2

divide each side by 40kg

1m/s = v2

For a transverse wave, the particles of the medium move a. perpendicular,  For a longitudinal wave, the particles of the medium move _parallel_ , The frequency of a wave describes how often particles of the medium oscillate back and forth.

1. c. move along a sine-wave like path from left to right

When a transverse wave travels through a rope, the individual particles of the rope move up and down in a perpendicular direction to the direction of wave propagation. This motion creates a wave pattern that resembles a sine wave. So, as the wave moves from left to right, the parts of the rope move along a sine-wave like path.

2. a. perpendicular

For a transverse wave, the particles of the medium (such as particles of a rope) move perpendicular to the direction that the wave moves. This means that the oscillation of the particles occurs up and down or side to side while the wave itself moves in a different direction.

3. b. parallel

For a longitudinal wave, the particles of the medium move parallel to the direction that the wave moves. In a longitudinal wave, the particles oscillate back and forth in the same direction as the wave propagation. An example of a longitudinal wave is sound waves, where air particles move in the same direction as the sound wave.

4. b. how often particles of the medium oscillate back and forth

The frequency of a wave describes how often particles of the medium oscillate back and forth. It represents the number of complete oscillations or cycles of the wave that occur per unit of time. Frequency is measured in hertz (Hz) and determines the pitch of a sound wave or the color of light in the case of electromagnetic waves.

5. Inceasing the frequency with which particles within a rope vibrate will result in a higher pitch or higher frequency of the resulting sound wave. The frequency of the wave is directly related to the frequency of the particles' vibrations.

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Answer:

The values of gravitational force and gravitational constant become same or equal when product of masses involved equals the square of distance between them.

As a parcel of air moves with the upper-level flow, a decrease in its absolute vorticity with respect to time is related to a short wave disturbing the flow. a is the correct option. As for the second question, the statement "The negative charge at the bottom of the storm cloud can cause dense positive charge on protruding objects, such as trees, poles, and buildings on the ground beneath the cloud" is True (Option b).

The decrease in absolute vorticity with time for a parcel of air moving with the upper-level flow is caused by a shortwave that disturbs the flow. As a result, the parcel is exposed to changing conditions as it progresses through the atmosphere, including variations in velocity, pressure, and temperature.

Shortwave is a type of mid- to upper-level disturbance that occurs when the amplitude of the flow is large enough to cause perturbations in the atmospheric flow that can be tracked as disturbances. A negative charge resides at the bottom of a storm cloud, while a positive charge resides at the top. As a result, the negatively charged bottom of the cloud is attracted to positively charged protruding objects like trees, poles, and buildings on the ground beneath it.

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Answer:

The particle momentum, p

Explanation:

A particle's de Broglie's wavelength is an indication of the scale in length where the particle's wave-like properties are important. The symbol of de Broglie wavelength is λ or \(\lambda _{dB}\) given as follows;

The de Broglie's wavelength formula is given as follows;

\(\lambda = \dfrac{h}{m \cdot v} = \dfrac{h}{p}\)

Where;

λ = The wavelength of the particle in meters

v = The velocity of the particle in meters/seconds

m = The mass of the particle in kilograms

p = The momentum of the particle

h = Planck's constant = 6.626 × 10⁻³⁴ J/Hz

Therefore, the alternative value that we must have to successfully determine the wavelength if the mass and velocity are unknown, is the momentum, p of the particle.

Answer:

24.5 m/s

Explanation:

Since the work done by the electric field on the charge equals the kinetic energy of the ball, then

qV = 1/2mv²

and v = √(2qV/m)

where q = charge = + 0.05 C, V = potential difference = 12.0 V, m = mass of ball = 2.0 g = 0.002 kg

Substituting the values into v, we have

v = √(2 × + 0.05 C × 12.0 V/0.002 kg)

= √(1.2 CV/.002 kg)

= √(600 CV/kg)

= 24.5 m/s

Jupiter's volume is more than ten times as large as Saturn's volume. This statement is true. Jupiter is the largest planet in our solar system with a volume of about 1,431,281,810,739 km³ while Saturn is the second-largest planet with a volume of about 827,129,915,150 km³.

Jupiter is approximately 11 times larger than Saturn. The two planets belong to the gas giant category, and they share many similarities such as having a large number of moons. Jupiter is famous for its Great Red Spot and powerful magnetic field, while Saturn is well-known for its stunning ring system. Both planets have been the focus of scientific research and exploration, and they continue to fascinate scientists and stargazers alike. In conclusion, Jupiter's volume is more than ten times as large as Saturn's volume.

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The average power developed by the boy during the climb is approximately 29.4 W.

In physics, the amount of energy transferred or converted per unit time is called power.

total height = number of steps x height of each step

total height = 30 x 0.15 m = 4.5 m

Given, time = 60 s

As power = work done / time

work done = force x distance

force = mass x gravity

mass is boy's mass (40 kg) and gravity is acceleration due to gravity (9.81 m/s²).

force = 40 kg x 9.81 m/s² = 392.4 N

The distance that the boy moves is equal to the total height that he has climbed: distance = total height = 4.5 m

work done = force x distance

work done = 392.4 N x 4.5 m = 1765.8 J

power = work done / time

power = 1765.8 J / 60 s

power ≈ 29.4 W

Therefore, the average power developed by the boy during the climb is approximately 29.4 W.

As for the anomalous behavior of water, water has a higher boiling point and melting point as compared to other substances with similar molecular weight. This is due to the strong hydrogen bonding between water molecules, which requires more energy to break the bonds and change the state of water from solid to liquid to gas.

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ᴄᴏᴘᴇʀɴɪᴄᴜꜱ' ᴛʜᴇᴏʀʏ ʟᴇᴅ ᴛᴏ ᴄʀɪᴛɪᴄᴀʟ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛꜱ ɪɴ ᴘʜʏꜱɪᴄꜱ ᴀɴᴅ ᴀꜱᴛʀᴏɴᴏᴍʏ ʙʏ ᴛʜʀᴇᴇ ᴏꜰ ʜɪꜱ ꜱᴜᴄᴄᴇꜱꜱᴏʀꜱ, ᴛʏᴄʜᴏ ʙʀᴀʜᴇ, ᴊᴏʜᴀɴɴᴇꜱ ᴋᴇᴘʟᴇʀ, ᴀɴᴅ ɢᴀʟɪʟᴇᴏ ɢᴀʟɪʟᴇɪ. ᴀꜱ ᴀ ʀᴇꜱᴜʟᴛ ᴏꜰ ᴛʜᴇɪʀ ᴡᴏʀᴋ, ᴛʜᴇ ᴄᴏᴘᴇʀɴɪᴄᴀɴ ᴍᴏᴅᴇʟ ʜᴀᴅ ɴᴇᴀʀ ᴜɴᴀɴɪᴍᴏᴜꜱ ꜱᴜᴘᴘᴏʀᴛ ᴡɪᴛʜɪɴ 150 ʏᴇᴀʀꜱ ᴏꜰ ᴛʜᴇ ᴘᴜʙʟɪᴄᴀᴛɪᴏɴ ᴏꜰ ᴅᴇ ʀᴇᴠᴏʟᴜᴛɪᴏɴɪʙᴜꜱ. (ᴛʜᴇ ᴄᴏᴘᴇʀɴɪᴄᴀɴ ʀᴇᴠᴏʟᴜᴛɪᴏɴ 227).

The Bernoulli Principle causes pressure to fall in a converging nozzle.

the properties of the fluid was changed to the following conditions they are the change in density, energy, mass.

what was nozzle mean ?

A nozzle is a spout on the end of a hose or pipe that is used to regulate the flow of a fluid such as water or air. A convergent nozzle is one that begins large and gradually becomes smaller, resulting in a decrease in cross-sectional area. Due to mass conservation, a fluid must accelerate as it enters the smaller cross-section. The fluid must travel quicker to keep a consistent amount of fluid passing through the limited part of the nozzle.

The energy required to accelerate this fluid must originate from someplace. Some energy is included in the random motion of molecules, which we perceive as pressure. This random motion's energy.

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Answer:

1/2 of your plate

Explanation:

C. is the answer because its 1/2 of your plate my opinion is that correct me if im wrong

(◠‿・)

The theory that dark matter is not real and is just a problem with our theory of gravity has been falsified by an observation of what happens when clusters of galaxies collide. The term dark matter was coined in 1933 by Fritz Zwicky.

The observed evidence for dark matter is quite strong, and we know it's unlikely to be a mathematical artifact because different galaxies appear to have different amounts of dark matter, with some not having any at all. If our model of gravity were in error, we would expect to see the same error in all galaxies we observe. This is not the case.

Instead, we observe that some galaxies behave exactly as the model says they should, and some behave as if they're heavier than they ought to be.

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Answer:

6.57 m/s

Explanation:

First use Hook's Law to determine the F the compressed spring acts on the mass. Hook's Law F=kx; F=force, k=stiffnes of spring (or spring constant), x=displacement

F=kx; F=180(.3) = 54 N

Next from Newton's second law find the acceleration of the mass.

Newton's .2nd law F=ma; a=F/m ; a=54/.75 = 72m/s²

Now use the kinematic equation for velocity (or speed)

v₂²= v₀² + 2a(x₂-x₀); v₂=final velocity; v₀=initial velocity; a=acceleration; x₂=final displacement; x₀=initial displacment.

v₀=0, since the mass is at rest before we release it

a=72 m/s² (from above)

x₀=0 as the start position already compressed

x₂=0.3m (this puts the spring back to it's natural length)

v₂²= 0 + 2(72)(0.3) = 43.2 m²/s²

v₂=\(\sqrt{43.2)\\\) = 6.57 m/s

Look at the image for answer

Answer:

C. Photosynthesis

Explanation:

Photosynthesis is a process by which plants and photosynthetic bacteria obtain their food in presence of sunlight from water and carbon dioxide. They produce glucose as the food and oxygen is emitted as the byproduct. The equation for photosynthesis is - 6H2O+6CO2 → C6H12O6 + 6O2

Thus, the correct answer is 'C.Photosynthesis.'