A 70 Newton dog ran across the yard. What do we know about the dog?
The dog's volume
The dog's weight
The dog's mass
The dog's acceleration

According to given data, the average speed of train is 25 km/h.

Given data,

distance = 5 km

time = 12 minutes

average speed = ?

changing time from minute to hour

So,

hour = 12 / 60

hour = 0.2

Then to calculate speed use the formula,

s = d / t

s = 5km / 0.2hr

s = 25 km/h

Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words, velocity is a vector value, whereas speed is a scalar value. It has a dimension of time-distance. As a result, the basic unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the metre per second (m/s) is the SI unit of speed.

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The electric power of the lamp is 240 watts.

The electric power of a lamp can be calculated using the formula:

Power = Current x Voltage

In this case, the current is 2 A and the voltage is 120 V.

Power = 2 A x 120 V = 240 watts (W)

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A brighter light source will result in a larger voltage drop across the resistor in a circuit with a phototransistor because the increased current flowing through the circuit causes a larger voltage drop according to Ohm's law.

If there is a single resistor in series with a phototransistor, a brighter light source would result in a larger voltage drop across the resistor.

The reason for this is that when the phototransistor is exposed to a brighter light source, more current will flow through the circuit because the phototransistor allows more current to pass through in the presence of a brighter light.

This increased current will cause a larger voltage drop across the resistor because the voltage drop across a resistor is directly proportional to the current flowing through it according to Ohm's law.

Ohm's law states that the voltage drop (V) across a resistor is equal to the current (I) flowing through it multiplied by the resistance (R) of the resistor:

V = IR.

Therefore, if the current through the circuit increases due to the brighter light source, the voltage drop across the resistor will also increase because the resistance of the resistor remains constant.

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The time needed for the bob of the simple pendulum to reach an angular position of -5° for the first time is approximately 0.158 seconds. This is calculated using the given values and the equation θ(t) = θ₀ * cos(ωt), where θ₀ is the initial angular displacement and ω is the angular velocity of the pendulum.

The period of oscillation of a simple pendulum is given by the formula:

T = 2π√(L/g)

where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity.

The period of oscillation is 1 second, we can rearrange the formula to solve for the length L:

L = (T^2 * g) / (4π^2)

Substituting the values:

L = (1^2 * 10 m/s²) / (4π^2)

L = 10 / (4π^2)

L ≈ 0.0796 m

Now, we can calculate the angular velocity of the pendulum:

ω = √(g/L)

ω = √(10 m/s² / 0.0796 m)

ω ≈ 12.6 rad/s

The equation for the angular displacement of a simple pendulum is given by:

θ(t) = θ₀ * cos(ωt)

where θ(t) is the angular displacement at time t, θ₀ is the initial angular displacement, and ω is the angular velocity.

θ₀ = 10° and we want to find the time when θ = -5°, we can set up the equation as follows:

-5° = 10° * cos(12.6 rad/s * t)

Solving for t:

cos(12.6 rad/s * t) = -0.5

Using the inverse cosine function:

12.6 rad/s * t = arccos(-0.5)

t = arccos(-0.5) / (12.6 rad/s)

Calculating the result:

t ≈ 0.158 seconds

Therefore, the time needed for the bob to reach the angular position of -5° for the first time is approximately 0.158 seconds.

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Answer:

Well Astronomy is study of stars or planets and chemistry is like potions

Explanation:

When we talk about pressure, it is essential to note that pressure is the force applied per unit area. The units for pressure are pascals (Pa). Here, we neglect air pressure.

We want to find the pressure at different depths of the ocean with a density of 1030 kg/m3 and gravity equal to 10m/s2.  We can use the formula P = ρgh to calculate pressure, where P is pressure, ρ is the density, g is the gravitational acceleration, and h is the height or depth. Let us find the pressure at each given depth.1. Pressure at a depth of 10 m: Using the formula, we have:P = ρgh= (1030 kg/m³) × (10 m/s²) × (10 m)P = 1.03 × 10⁵ PaTherefore, the pressure at a depth of 10 m is 1.03 × 10⁵ Pa.2. Pressure at a depth of 100 m: Using the same formula, we have:P = ρgh= (1030 kg/m³) × (10 m/s²) × (100 m)P = 1.03 × 10⁶ PaTherefore, the pressure at a depth of 100 m is 1.03 × 10⁶ Pa.3. Pressure at a depth of 1000 m: Again, using the same formula, we have:P = ρgh= (1030 kg/m³) × (10 m/s²) × (1000 m)P = 1.03 × 10⁷ PaTherefore, the pressure at a depth of 1000 m is 1.03 × 10⁷ Pa.4. Pressure at the bottom of the ocean (2000 m): Lastly, we use the same formula:P = ρgh= (1030 kg/m³) × (10 m/s²) × (2000 m)P = 2.06 × 10⁷ PaTherefore, the pressure at the bottom of the ocean (2000 m) is 2.06 × 10⁷ Pa.

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The 100-watt light bulb represents the RMS power consumption, while the 120V AC source corresponds to the maximum voltage amplitude.

The 100-watt power rating of the light bulb refers to the average power it consumes.The 100-watt power rating of a light bulb refers to the average power it consumes when operated at its rated voltage. Power is a measure of the rate at which energy is consumed, and in this case, it indicates how much electrical energy the light bulb converts into light and heat per unit of time. The 100-watt rating gives an indication of the brightness or light output that can be expected from the bulb.

On the other hand, the 120V AC source represents the maximum voltage amplitude it can provide. In electrical systems, voltage represents the potential difference between two points and determines the force or pressure of the electrical current. The 120V AC source implies that it can supply a voltage with a maximum amplitude of 120 volts. AC stands for alternating current, which means the voltage periodically changes its polarity over time.

The 120V AC source represents the maximum voltage amplitude it can provide.

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Part A: To determine the rate at which heat is discarded to the environment by the power plant, we need to calculate the heat input to the power plant and then subtract the useful work output.

Given:

Power output of the steam turbine = 518 MW

Thermal efficiency of the power plant = 40% or 0.40

The thermal efficiency is defined as the ratio of the useful work output to the heat input:

Thermal efficiency = (Useful work output) / (Heat input)

Rearranging the equation, we can solve for the heat input:

Heat input = (Useful work output) / (Thermal efficiency)

Calculations:

Heat input = (518 MW) / (0.40) = 1295 MW

Since the thermal efficiency represents the fraction of the heat input that is converted into useful work, the remaining fraction is the heat discarded to the environment:

Heat discarded = Heat input - Useful work output

Heat discarded = 1295 MW - 518 MW = 777 MW

Therefore, the rate at which heat is discarded to the environment by this power plant is approximately 777 MW.

Part B: To determine the rate at which heat must be supplied to the power plant by burning coal, we use the thermal efficiency and the heat input calculated in Part A.

Heat input = 1295 MW

Therefore, the rate at which heat must be supplied to the power plant by burning coal is approximately 1295 MW.

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Answer:4 and 5

Explanation:it you add 1+3 and 2+3 it is 4 and 5

I hope this helps.......

Python based Flask is a microweb framework that is intended to be straightforward, lightweight, and simple to use. It Flask set of capabilities for creating web applications, such as routing, managing

Python-based Flask is a microweb framework. It offers a simple interface for creating web applications, letting programmers utilise the tools they want without being constrained in their inventiveness. Flask is a well-liked option for both small and big projects since it is portable and simple to use. Flask, which is frequently used for prototyping and creating APIs, enables for simple, effective development because to its modular architecture and tiny codebase. In addition, the huge Flask developer community offers a multitude of tools and plugins for customization and added functionality. For developers searching for a lightweight, adaptable framework for their web development needs, Flask is an excellent option.

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0.438 s is the period of the wave.

So, the correct answer is A.

To determine the period of the wave, we need to divide the total time taken (3.50 s) by the number of complete oscillations (8.00).

The period (T) is the time required for one complete oscillation.

T = total time / number of oscillations

T = 3.50 s / 8.00

T = 0.4375 s

Rounded to three decimal places, the period of the wave is 0.438 s, which corresponds to option A.

Your question is incomplete but most probably your full question was:

If a wave takes 3.50 s to complete 8.00 complete oscillations, what is the period of the wave?

a. 0.438 s

b. 4.50 s

c 2.29 s

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The CMB provides strong evidence that the universe was once in a hot and dense state, and its existence is one of the strongest confirmations of the Big Bang theory.

The cosmic microwave background (CMB) is a faint radiation left over from the Big Bang, which is the widely accepted scientific theory that explains the origin of the universe. The Big Bang theory predicts that the universe began as a hot, dense, and expanding state, and as it expanded, it cooled down and radiation was emitted in all directions. This radiation has been traveling through space for billions of years and has cooled down to just a few degrees above absolute zero. In the 1960s, the CMB was discovered by radio astronomers and was found to be consistent with the predictions of the Big Bang theory. Hence,the CMB provides strong evidence that the universe was once in a hot and dense state, and its existence is one of the strongest confirmations of the Big Bang theory.

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Explanation:The iodine isotopes used in nuclear medicine are iodine-123 and iodine-131. They are both radioactive and have different half-lives, which make them useful for different purposes in medical imaging and treatment.Iodine-123 is a gamma emitter with a half-life of just over 13 hours. It is used for imaging and diagnosis of thyroid disorders.

It accumulates in the thyroid gland, which makes it possible to obtain images of the thyroid with a gamma camera. The images can show whether the thyroid gland is functioning normally or whether there are nodules or other abnormalities.Iodine-131 is a beta and gamma emitter with a half-life of approximately 8 days. It is used for treatment of cancer of the thyroid gland. When it is taken up by the thyroid gland, it emits beta particles that destroy the cancer cells. The gamma radiation emitted by iodine-131 can also be used to monitor the progress of the treatment.Long answer:Two radioisotopes of iodine are used in nuclear medicine. They are iodine-123 and iodine-131. Iodine-123 is a gamma emitter with a half-life of just over 13 hours. It is used for imaging and diagnosis of thyroid disorders. Iodine-131 is a beta and gamma emitter with a half-life of approximately 8 days. It is used for treatment of cancer of the thyroid gland.The thyroid gland accumulates iodine.

This is why these two isotopes are useful in nuclear medicine. Iodine-123 accumulates in the thyroid gland, which makes it possible to obtain images of the thyroid with a gamma camera. The images can show whether the thyroid gland is functioning normally or whether there are nodules or other abnormalities. This is important for the diagnosis of thyroid disorders such as hypothyroidism, hyperthyroidism, and thyroid cancer.Iodine-131 is used for the treatment of thyroid cancer. When it is taken up by the thyroid gland, it emits beta particles that destroy the cancer cells. The gamma radiation emitted by iodine-131 can also be used to monitor the progress of the treatment. This is important because it allows doctors to see whether the treatment is working or whether more treatment is needed.In summary, iodine-123 is used for imaging and diagnosis of thyroid disorders, while iodine-131 is used for treatment of cancer of the thyroid gland. Both isotopes are useful in nuclear medicine because of their ability to accumulate in the thyroid gland.

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Shells are the orbits in which electrons move with high velocities. The number of shells in an element also indicates the Period number.

The nucleus is in the centre of the element. It holds the protons and neutrons.

Shells: Shells or orbits are circular paths around the nucleus in an atom in which the electrons revolve.

Nucleus: It is the center of an atom that contains protons and neutrons.

The difference between Shell and nucleus is-

1. Nucleus is primarily composed of both proton and neutron that is positively and negatively charged particles while the shell is composed of only electrons that are negatively charged particles.

2. The probability of finding an electron in the nucleus is negligible while the probability of finding an electron in shells is maximum. Electrons occupy different shells based on their energy levels.

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Answer:

D. Pearl Harbor

Explanation:

Matter in motion possesses energy in various forms such as kinetic energy and potential energy.  The right option is B and C.

Kinetic energy is the energy possessed by an object in motion.

Potential energy, on the other hand, is the energy possessed by an object due to its position or configuration.

Heat flow is the transfer of thermal energy from a body at a higher temperature to one at a lower temperature.

The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted from one form to another. This law implies that the total amount of energy in a system remains constant.

The second law of thermodynamics states that in any energy transfer or transformation, the total amount of usable energy in a system decreases. This law implies that energy tends to flow from a higher state of order to a lower state of order.

Therefore, it is difficult to achieve 100% efficiency in any energy transfer process.

In conclusion, matter in motion possesses energy in different forms, and the laws of thermodynamics govern energy transfer and transformation processes.

Understanding these laws is crucial in various fields, including engineering, physics, and chemistry. Therefore, the correct option is B and C.

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Age of the universe, the age we get is less than the Hubble time

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall

The universe is thought to be 13.77 billion years old. The distances and radial velocities of other galaxies, the majority of which are eclipsing our own at speeds proportionate to their distances, are used to determine this age.

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\(\textbf{Use equation of momentum}\)

\(p=mv\)

\(\text{momentum\ =\ mass x velocity}\)

\(\textbf{Substitute in the values}\)

\(5000 \times 75 = 375,000 \text{\ kg\ km/hr}\)

\(4200 \times 75 = 315,000 \text{\ kg\ km/hr}\)

\(\textbf{The\ small\ sports\ car\ will\ have\ the\ most\ momentum.}\)

Answer:

highest at top

f=b

e=a=d

c

Explanation:

To determine the new force of gravity in the first scenario, we can use the formula for gravitational force:

\(Fg = (G * m1 * m2) / r^2,\)

where G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.

If we triple the mass of one object and double the distance between their centers, the new force of gravity can be calculated as follows:

New \(Fg = (G * (3m) * m) / (2r)^2.\)

Simplifying this expression, we get:

New Fg = (G * 3m * m) / (4r^2).

Since (3m * m) / (4r^2) is equivalent to (3/4) * (m * m) / (r^2), we can rewrite the equation as:

New \(Fg = (3/4) * (G * m * m) / r^2.\)

Comparing this to the original force of gravity, Fg, we see that the new force is (3/4) times the original force. Therefore, the answer is C) 0.75 Fg.

Regarding the second scenario, for objects in stable orbit, the orbital period is determined by the formula:

\(T = 2π * sqrt(r^3 / (G * M)),\)

where T is the orbital period, r is the distance between the center of the object and the center of the Earth, G is the gravitational constant, and M is the mass of the Earth.

If Satellite B is twice as far from the Earth's center compared to Satellite A, we can say that r_B = 2 * r_A.

Let's compare the orbital periods of the two satellites:

T_B = 2π * sqrt((2r_A)^3 / (G * M)) = 2π * sqrt(8r_A^3 / (G * M)).

T_A = 2π * sqrt(r_A^3 / (G * M)).

Dividing T_B by T_A, we get:

T_B / T_A = (2π * sqrt(8r_A^3 / (G * M))) / (2π * sqrt(r_A^3 / (G * M))).

Simplifying this expression, we find:

T_B / T_A = sqrt(8r_A^3 / (r_A^3)) = sqrt(8) = 2.83.

Therefore, the answer is a) 2.83 times larger.

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When two objects are experiencing gravitational attraction, if you triple the mass of one of the objects and double the distance between their centers, the new force of gravity compared to the old will be 0.75 times the original force (0.75 Fg).The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

This is because the force of gravitational attraction between two objects is inversely proportional to the square of the distance between their centers of mass. If you double the distance between two objects, the force of gravitational attraction decreases by a factor of 4 (2^2). On the other hand, if you triple the mass of one of the objects, the force of gravitational attraction increases by a factor of 3.

Therefore, combining these effects, the new force of gravity will be 3/4 or 0.75 times the original force.

Satellite A and Satellite B are both in stable orbit around the Earth, but Satellite B is twice as far from the Earth's center as Satellite A. The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

This is because the orbital period of an object in circular motion is dependent on the radius of the orbit. The further an object is from the center of the orbit, the longer it takes to complete one full orbit. Since Satellite B is twice as far from the Earth's center as Satellite A, its radius is also twice as large. The orbital period is directly proportional to the radius, so Satellite B's orbital period will be 2.83 times larger than Satellite A's orbital period.

Therefore, the correct statement is:

The new force of gravity compared to the old will be 0.75 Fg.

The orbital period of Satellite B compared to Satellite A is 2.83 times larger.

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If I move 3 m east and 4 m north, then my displacement would be 5m.

In geometry and mechanics, displacement is defined as a vector whose length is the shortest distance from initial to the final position of a point P undergoing the motion.

If an object moves relative to the reference frame—for example, if professor moves to the right relative to whiteboard or passenger moves toward the rear of airplane—then object's position changes. And this change in position is known as displacement.

Given AB= 3m east and BC= 4m north

AC= √ 3² + 4²= 25

So, AC, displacement = 5m

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The buoyant force of the cube is 23 / 12 gcm^-3. Upthrust, often known as buoyancy, is an upward force applied by a fluid against the weight of an object that is partially or completely submerged.

Upthrust, often known as buoyancy, is an upward force applied by a fluid against the weight of an object that is partially or completely submerged. The weight of the fluid on top causes pressure in a fluid column to rise with depth.

Any object in water experiences a buoyant force that works against gravity, causing it to shed some of its weight. The buoyant force acting on the object will be equal to gravity and it will float if it displaces an amount of water equal to its own weight.

Let the side of metal be L.

So the of base is A = L²

Now the weight of 144 g weight will be balanced by the buoyancy force due to 1/2cm length of metal cube (p = 2gcm^-3)

So buoyancy force is F = A x L1pg=L^2 x 1/2 x 2x10

L = 12cm

This force is equal to weight of 144gm.

so, L² x 1/2 x 2 x 10 = 144 x 10

L = 12 cm

when no weight was placed the 1/2 cm was above the liquid.

so total length under weight was L - 1/2 = 23/ 2 cm

weight of block = buoyancy force

pmetal x L³ x g = p x L² x 23/2 x g

pmetal = 23 / 12 gcm^-3

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Answer:

acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object.

SI unit: m/s2, m·s−2, m s−2

Answer:

no

Explanation:

Answer sunlight, water and carbon dioxide

Explanation:

Plants absorb sunlight, water and carbon dioxide for photosynthesis, using solar energy to split the water molecule into hydrogen and oxygen and power a chemical reaction that assimilates carbon dioxide, producing carbohydrates used to fuel the plants' survival.

For a PT100 sensor, a 1 °C temperature change will cause a 0.384-ohm change in resistance, so even a small error in measurement of the resistance can cause a large error in the measurement of the temperature.

A large temperature range (from -200 to +850 °C) is covered by the exceptional accuracy of platinum resistance thermometers (PRTs). Standard sensors come in a wide range of accuracy criteria and package choices to accommodate the majority of applications. It's not essential to utilize special wires to connect to the sensor, unlike thermocouples. To best suit the application, care should be used when selecting the probe and cable types. The temperature range and exposure to liquids (corrosive or conductive) or metals are the key problems. Without a certain, temperatures higher than approximately 170 °C shouldn't be used for regular solder connections on cables.

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Answer:

100 N left <--

Explanation:

Answer:

100 to the left

Explanation:

When an object absorbs light energy, it reflects none of the colors. The correct option is B.

The change in direction of a wavefront at an interface between two different media so that the wavefront returns to the medium from which it originated is referred to as reflection. Reflection of light, sound, and water waves are common examples.

Objects appear different colors because they absorb certain colors (wavelengths) while reflecting or transmitting others. The wavelengths that are reflected or transmitted are what we see as colors.

If photon energy is absorbed, the energy from the photon is typically manifested as heating the matter.

Light absorption causes an object to become dark or opaque to the wavelengths or colors of the incoming wave: Wood is impervious to visible light.

Thus, the correct option is B.

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