ou are paddling a boat across an 18m wide river at 1.8 m/s. a current, meanwhile is pulling you downstream at 4m/s. a. how long does it take you to cross the river? b. how far downstream have you drifted when you reach the far shore?

The effect of the factors which he can he actually find out using only this lamp to determine the size of shadow is the light intensity and type of object.

This forms part of the scientific methods and is referred to as a procedure which is used to support or refute an hypothesis.

The size of the shadow is dependent on factors such as the light intensity and the type of object. Since the lamp produces the light in which the intensity can be gotten and the type of material it is in contact with then it therefore the correct choices.

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If you travel at a constant speed of 75 mph, it will take you 1 hour 17 minutes approx. to reach the city.

We know that ,

1mph = 1.6 km/hr.

multiplying both by 75,

75 mph = 120km/hr.

Now , it takes 1hr to travel 120 km

120 km = 1 hour

multiplying both by 1.17

120 x 1.17 km= 1 x 1.17 hrs.

140 km = 1.17 hours (approx.)

And 1.17 hours can also be said as 1 hour 17 minutes.

Hence, it will take you 1 hour 17 minutes approx. to reach the city.

In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval whereas instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.

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Answer:

gravitational force

Explanation:

Moving up the kinetic chain (from one segment analysis to the next) in inverse dynamics is possible because of the chain rule of calculus.  

A kinetic chain is a series of interconnected parts or components in a system that are connected by links, joints, or other means, and that work together to produce movement or motion. A kinetic chain can be found in many different types of systems, including mechanical systems, biological systems, and engineering systems. In mechanical systems, a kinetic chain might be used to transfer motion or power from one part of the system to another.

In biological systems, a kinetic chain might be used to transmit signals or movements between different parts of the body. For example, the muscle-tendon-bone system is a kinetic chain that allows the muscles to generate force and move the body.

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Correct Question:

Moving up the kinetic chain (from one segment analysis to the next) in inverse dynamics is possible because of _______.

Answer:

D. The Acceleration of object A is twice that of Object B.

This is because a force pushing on something light will move faster than an equally strong force pushing on something heavier.

The work done by the man to lift the boxes is equal to the change in potential energy of the boxes as they are raised from the ground to the shelf.

The potential energy gained by each box is given by the product of its weight and the height it is lifted:

Potential energy gained by one box = 100 N x 1.5 m = 150 J

Since there are three boxes, the total potential energy gained by lifting all the boxes together is:

Total potential energy gained = 3 x 150 J = 450 J

The work done by the man is equal to the force he applied (the weight of the boxes) multiplied by the distance the boxes were lifted:

Work done by the man = force x distance

= (3 x 100 N) x 1.5 m

= 450 J

Therefore, the man produced 450 J of useful energy lifting the boxes onto the shelf.

Note that this calculation assumes that the lifting was done with 100% efficiency and does not take into account any losses due to friction or other factors.

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In summary, the observations about determining ages of rocks and fossils are based on scientific principles such as radioactive decay, superposition, and original horizontality.

A scientific principle is a fundamental concept or law that explains how the natural world works. It is a statement based on empirical evidence and repeated observations that is widely accepted by the scientific community as a fundamental truth. Scientific principles provide a framework for understanding and explaining natural phenomena, and they form the basis for scientific research and discovery.

Examples of scientific principles include:

The law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.

The theory of evolution, which explains how species change over time through natural selection and genetic variation.

The law of gravity, which explains the attraction between objects with mass and their impact on space-time.

The principle of relativity, which explains how the laws of physics are the same for all observers in uniform motion relative to each other.

Scientific principles are subject to change and refinement as new evidence and discoveries are made, but they provide a reliable foundation for scientific inquiry and understanding.

Here,

1. Observations about determining ages of rocks and fossils:

Scientists use a variety of methods to determine the ages of rocks and fossils, such as radiometric dating, relative dating, and stratigraphy.

Radiometric dating involves measuring the decay of radioactive isotopes in rocks or fossils, which provides an estimate of the time elapsed since the material was last heated or exposed to sunlight.

Relative dating involves comparing the ages of rocks or fossils based on their position in relation to one another.

Stratigraphy involves studying the layers of rock or sedimentary deposits to determine the relative ages of the materials.

2. Explanation based on scientific principles:

Radiometric dating is based on the principle of radioactive decay, which is the spontaneous breakdown of atomic nuclei into smaller particles over time. The rate of decay is constant, which allows scientists to use the amount of remaining radioactive material to estimate the time elapsed since the material was last heated or exposed to sunlight.

Relative dating is based on the principle of superposition, which states that the oldest rocks or fossils are found at the bottom of a sequence, while the youngest rocks or fossils are found at the top. By comparing the ages of rocks or fossils in different layers, scientists can determine their relative ages.

Stratigraphy is based on the principle of original horizontality, which states that sedimentary layers are deposited in horizontal layers. By studying the layers of rock or sedimentary deposits, scientists can determine the relative ages of the materials based on their position.

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Answer:

Since there is more centrifugal force at the equator to cancel gravity, your overall weight at the equator versus at the poles is even less

Explanation:

At constant velocity, the crate would be in equilibrium, so that Newton's second law tells us

p + (-f ) = 0

where p and f denote the magnitudes of the added pushing force and friction force, respectively.

The friction force is proportional to the normal force by a factor of µ, the coefficient of friction. There's no vertical movement going on, so Newton's second law says

n + (-w) = 0

where n and w are the magnitude of the normal force and the weight of the crate, respectively.

Compute n :

n = w = (25 kg) (9.80 m/s²) = 245 N

Use this and µ = 0.45 to compute f :

f = µ n = 0.45 (245 N) = 110.25 N

Solve for p :

p + (-110.25 N) = 0

p = 110.25 N ≈ 110 N

The force i.e required to move the crate at a constant velocity across the floor is 110 N.

At the same velocity, the crate should be in equilibrium, so as per Newton's second law, the following formula should be used:

p + (-f ) = 0

p means the magnitudes of the added pushing force

f means the friction force

n = w = (25 kg) (9.80 m/s²) = 245 N

Now

force should be

= µ n

= 0.45 (245 N)

= 110.25 N

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The force that causes centripetal acceleration of a car making a turn on a flat road is friction

The centripetal acceleration is required to create a centripetal force. The centripetal force that cause an object to turn in a circular path is due to the force of friction between the tyres and the road. The magnitude of centripetal force is numerically equal to the magnitude of frictional force.

Fc = f

m v² / r = μ N

Fc ∝ 1 / r

The larger the centripetal force the the smaller the radius of curvature.

Therefore, the force that causes centripetal acceleration of a car making a turn on a flat road is friction

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Answer:

15 kg

Explanation:

mass=force÷acceleration

force: 75N

acceleration: 5 m/s^2

mass = 75 / 5

= 15 kg

If the answer made sense, please give me brainliest :)

Answer:

4.17

Explanation:

We started at 95 and went down to 50 in 3 seconds.

The change in volocity would be about -45 km

distance traveld maybe 60

And power around 83.9 kw

I might be wrong so im sorry if I am.

I have not done this in a while.

The peak wavelength of the student's blackbody radiation curve is \(9.45 x 10^-6\) meters.

The peak wavelength of blackbody radiation emitted by an object is given by Wien's displacement law, which states that the product of the peak wavelength and the temperature of the object is constant. The constant is approximately equal to \(2.898 x 10^-3 mK\). Therefore, to find the peak wavelength of the student's blackbody radiation curve, we can use the equation:

λ_peak = b/T

where λ_peak is the peak wavelength, b is the constant, and T is the temperature in Kelvin.

First, we need to convert the temperature of the student's skin from degrees Celsius to Kelvin:

T = 33.0 + 273.15

T = 306.15 K

Now we can plug in the values to find the peak wavelength:

λ_peak = \((2.898 x 10^-3 mK) / (306.15 K)\)

λ_peak =\(9.45 x 10^-6 meters\)

Therefore, the peak wavelength of the student's blackbody radiation curve is \(9.45 x 10^-6\) meters.

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The intensity level of the sound at a distance of 15 m from the pneumatic drill is approximately 30.41 dB.

To calculate the intensity level in decibels (dB), we can use the formula:

I_level = 10 * log10(I/I0)

Where I is the sound intensity and I0 is the reference intensity, which is typically set at 1.0 × 10^(-12) W/m².

Given that the sound intensity is 0.0011 W/m², we can calculate the intensity level as follows:

I_level = 10 * log10(0.0011/1.0 × 10^(-12))

I_level = 10 * log10(0.0011) - 10 * log10(1.0 × 10^(-12))

I_level = 10 * (log10(0.0011) - log10(1.0 × 10^(-12)))

Using logarithmic properties, we can simplify the expression:

I_level = 10 * log10(0.0011 * 10^12)

I_level = 10 * log10(1100)

I_level ≈ 10 * 3.0414

I_level ≈ 30.41 dB

Therefore, the intensity level of the sound at a distance of 15 m from the pneumatic drill is approximately 30.41 dB.

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Answer:

gravity it's what keeping it to rotate and keeping it looping

Answer:

D

Explanation:

I just took and i got it correct

Answer:

D

Explanation:

D

Answer:

The volume of the object is 3.5cm³

Option C, The amount of power produced by the automobile and the horse cannot be established purely based on the facts supplied.

Power may be estimated by dividing the amount of work or energy by the amount of time it takes to perform the work or transfer the energy. Power is defined as the pace at which work is completed or energy is transmitted.

Only the time required for each trip is provided in the issue; no information on the distance traveled, the amount of work completed, or the amount of energy used during each journey is provided. As a result, it is impossible to say whether one generates more power than the other or if their output is equal.

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The question is -

Imani drives her car from point A to point B, the trip takes 1 hour; then rides her horse from point B back to point A, this trip takes 2 hours. Does the car or the horse produce more power?

A. the car

B. the horse

C. No power is involved.

D. Both produce the same amount of power.

Looking at the graph and its missing parts, we can identify the following items to fill each box:

A. Population Size.

Since the population size is a dependent variable in relation to time, we should use it in the vertical axis.

B. Slow growth when population is small.

In the first part of the graph, the population is small and also grows slowly.

C. Faster and faster growth as population becomes larger.

In the final part of the graph, the population is big and also grows fast.

D. Time

Since the time usually is an independent variable, we should use it on the horizontal axis.

For the continuous probability distribution probability at any constant value is 0. Because the interval width is 0 in that case. There must always be an interval to calculate the probability in case of a uniform distribution.

Continuous probability distribution: A probability distribution in which the random variable X can take on any (continuous) value. Since there are an infinite number of values that can be assumed by X, the probability that X will take a given value is zero.

For the probability distribution of continuous distributions in this problem each constant value is 0.

P[x= 50] = 0

P(the journey will take exactly 50 minutes) = 0

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From the given options let's select the example which shows a conceptual model.

A conceptual model can be said to be a model which shows an abstract representation of any concept which can be visualized or imagined than other models.

It is a model which the designers want users to understand.

From the list, the best option which is an example of a conceptual model is a mental image of gas molecules as tiny balls.

Let's say, for example, you imagine or have a mental picture of gas molecules using your imagination, it helps to understand how a vacuum system works and you can easily solve the problem if something goes wrong.

Therefore, the example of a conceptual model is:

A mental image of gas molecules as tiny balls.

• ANSWER:

A. mental image of gas molecules as tiny balls

Answer:

sequence

Explanation:

sequences are the way in which things are ordered, for example: 1, 2, 3, 4 is a sequence:)

Answer:

Once the weighted end of the pendulum is released, it will become active as gravity pulls it downward. Potential energy is converted to kinetic energy, which is the energy exerted by a moving object. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.

Explanation:

Answer:

below

Explanation:

3600 seconds in an hour

  900 sec / 3600 sec/hr = .25 hr

80 km /hr * .25 hr = 20 km

(a) Given the empty space, the atmospheric pressure by barometer Q is 3.92 x 10⁴ Pa

(b) Pressure at point E, there is no air.

(c) The atmospheric pressure drops when barometer P is brought up to the mountains.

(a) The pressure exerted by the atmosphere can be calculated using the formula P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column. In this case, the fluid is mercury and the height of the column is 0.28 m. Therefore, the atmospheric pressure can be calculated as:

P = ρgh = (14 x 10³ kg/m³)(10 N/kg)(0.28 m) = 3.92 x 10⁴ Pa

(b) To find the pressure at point E, we need to consider the pressure due to the mercury column as well as the pressure due to the air in the space above the mercury column. The pressure due to the mercury column can be calculated using the same formula as in part (a):

P1 = ρgh = (14 x 10³ kg/m³)(10 N/kg)(1.00 m) = 1.40 x 10⁵ Pa

To find the pressure due to the air, we can use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. Since the volume of the air is constant, we can write:

P₂/T = nR/V

Assuming that the air behaves as an ideal gas:

P₂ = nRT/V

Since the pressure and volume of the air are constant:

P₁ + P₂ = constant

Therefore:

P₂ = -P₁ = -1.40 x 10⁵ Pa

Converting this pressure to mm Hg:

P₂ = (-1.40 x 10⁵ Pa)(760 mm Hg/101325 Pa) = -1046 mm Hg

Since pressure cannot be negative, we can conclude that there is no air in the space above the mercury column at point E.

(c) When barometer P is brought up to the mountains, the atmospheric pressure decreases. This will cause the mercury column in the tube to fall, leaving a larger column of vacuum at the top of the tube. The reason for this is that the weight of the atmosphere pushing down on the mercury in the dish is reduced at higher altitudes. As a result, the pressure exerted by the atmosphere on the surface of the mercury decreases, causing the mercury column to fall.

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Answer:

an ostrich

Explanation:

an ostrich is the animal thar can run 30 mph

Reindeer, Cat (domestic), Kangaroo ,Grizzly bear are the  animal can sprint at speeds up to 30 miles per hour.

Speed of Animals -

What animal has the best speed?

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Answer: Pure-Tone Audiometry

Explanation:

Pure-tone audiometry refers to the behavioral test that is used in the measurement of hearing sensitivity. Pure tone audiometry an hearing test that's used in the identification of an individuals hearing threshold levels which is used in determining the degree of a hearing loss and then a basis for diagnosis will be provided.

Therefore, Pure-Tone Audiometry is a procedure that's used for measuring hearing sensitivity at certain frequencies using pure tones presented through an oscillator placed on the forehead or mastoid bone of the listener.

The magnitude of the electric force on the 0.13C charge is approximately 1.538 * 10⁻⁷ N and the magnitude of the electric field halfway between the two charges is approximately 5.073 * 10⁶ N/C.

To calculate the magnitude of the electric force on the 0.13C charge, we can use Coulomb's law, which states that the magnitude of the electric force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.

Given:
Charge 1 (Q1) = 0.03C
Charge 2 (Q2) = 0.13C
Distance (r) = 3.15m

1. Determine the electric force:
Using Coulomb's law formula, F = k * |Q1 * Q2| / r², where k is the electrostatic constant (9 * 10^9 Nm²/C²):

F = (9 * 10^9 Nm²/C²) * |0.03C * 0.13C| / (3.15m)²
F = (9 * 10^9 Nm²/C²) * (0.03C * 0.13C) / (3.15m * 3.15m)
F ≈ 1.538 * 10⁻⁷ N

Therefore, the magnitude of the electric force on the 0.13C charge is approximately 1.538 * 10⁻⁷ N.

2. Calculate the magnitude of the electric field halfway between the two charges:
To find the electric field halfway between the two charges, we can consider the charges as point charges and use the formula for electric field, E = k * |Q| / r².

Given:
Charge (Q) = 0.13C
Distance (r) = (3.15m) / 2 = 1.575m

E = (9 * 10^9 Nm²/C²) * |0.13C| / (1.575m)²
E ≈ 5.073 * 10⁶ N/C

Therefore, the magnitude of the electric field halfway between the two charges is approximately 5.073 * 10⁶ N/C.

In summary:
- The magnitude of the electric force on the 0.13C charge is approximately 1.538 * 10⁻⁷ N.
- The magnitude of the electric field halfway between the two charges is approximately 5.073 * 10⁶ N/C.

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The secondary coil consists of 500 loops and has an output voltage of 1000 V. If the primary coil had only 25 loops, that the voltage across the primary coil is 50 V.

The voltage across the primary coil can be determined using the principle of transformer voltage ratios. The voltage ratio in a transformer is equal to the ratio of the number of loops in the secondary coil to the number of loops in the primary coil.

In this case, the secondary coil has 500 loops and an output voltage of 1000 V. The primary coil has 25 loops, and we want to find the voltage across it.

The voltage ratio is given by:

Voltage ratio = Number of loops in secondary coil / Number of loops in primary coil

Voltage ratio = 500 / 25 = 20

Therefore, the voltage across the primary coil is the voltage across the secondary coil divided by the voltage ratio:

Voltage across primary coil = Voltage across secondary coil / Voltage ratio

Voltage across primary coil = 1000 V / 20 = 50 V

Therefore, the voltage across the primary coil is 50 V.

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