A high diver of mass 74.0 kg jumps off a board 9.00 m above the water. If his downward motion is stopped 2.50 seconds after he enters the water, what average upward force did the water exert on him​

For part a).

Horizontally

v=velocity=32 m/s

d=distance=18m

so we use the next formula to calculate the time

we isolate the time

we substitute the data

For the drop distance, we use the next formula

where vi is the initial velocity, g is the gravity and d is the distance

vi=0 m/s

g=9.8 m/s^2

t=0.56 s

b)

drop distance decreases because it will take less time for the baseball to travel to the catcher.

c)

Drop distance would decrease because the gravity is less on the moon and therefore the ball would not fall as fast

Answer:

n. Abbr. BMR. The rate at which energy is used by an organism at complete rest, measured in humans by the heat given off per unit time, and expressed as the calories released per kilogram of body weight or per square meter of body surface per hour.

Explanation:

Explanation:

I believe the answer is 12 N

Answer:

The average densities of both matches the expected density for objects made from water ice.

Explanation:

Charon's density is 1.2 to 1.3 g / cm3, while Pluto's density is 1.8 to 2.1 g / cm3. This was discovered in many researches and measurements of these two celestial bodies, with the objective of understanding them and promoting efficient scientific knowledge.

With the measurements of the average densities between pluto and Charon it was possible to conclude several statements about them. Firstly, it is possible to see that the two formed independently and at different times, in addition to indicating the existence of few rocks in charon, which is consistent with the average density of objects made mostly of water ice.

Answer:

They have the same amount of energy

Explanation:

Electrons are said to be the subatomic particles that move around the nucleus of an atom. These electrons are negatively charged particles that are seen to be quite smaller than the nucleus of an atom.  

The electron shells of these atoms are usually being filled from the inside out with the low-energy shells closer to the nucleus being filled before they can go into the much higher-energy shells that are a bit out

The electrons in the same shell have the same amount of energy and the same principal energy level. The correct answer is (A).

An atom's fundamental energy level, commonly referred to as the energy "shell," is the same for electrons in the same shell. The major energy level, which also controls the electron's typical separation from the nucleus, closely correlates to the electron's energy level.

Electrons within the same shell have the same energy level, although they may have different sublevels or orbitals within that shell.

Therefore, The electrons in the same shell have the same amount of energy and the same principal energy level. The correct answer is (A).

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According to the question the speed of the skater's hands is 528 m/min.

To calculate the speed of the skater's hands, we can use the formula:

Speed = Circumference * Revolutions per minute

Given that the skater's hands are 140 cm apart and she spins at 120 rpm, we need to calculate the circumference of the circle formed by her hands.

The circumference of a circle is given by the formula:

Circumference = 2 * π * radius.

In this case, the radius is half the distance between the skater's hands, which is 140 cm / 2 = 70 cm.

Converting the radius to meters, we have 70 cm = 0.7 m.

Now we can calculate the circumference:

Circumference = 2 * π * 0.7 m = 4.4 m (rounded to one decimal place).

Finally, we can calculate the speed of the skater's hands:

Speed = Circumference * Revolutions per minute

     = 4.4 m * 120 rpm

     = 528 m/min.

Therefore, the speed of the skater's hands is 528 m/min.

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In incomplete tetanus, the muscle is producing near-peak tension during rapid cycles of contraction and relaxation. Wave summation refers to the addition of one twitch to another.

What are concentric contractions?

A concentric contraction is a type of muscle activation that causes tension in your muscle as it shortens. As your muscle shortens, it generates enough force to move an object. This is the most popular type of muscle contraction. In weight training, a bicep curl is an easy-to-recognize concentric movement.

During incomplete tetanus, the muscle goes through quick cycles of contraction with a short relaxation phase for each. If the stimulus frequency is so high that the relaxation phase disappears completely, contractions become continuous in a process called complete tetanus.  If the frequency of action potentials generated increases to such a point that muscle tension has reached its peak and plateaued and no relaxation is observed then the muscle contraction is described as tetanus.

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Both enthalpy (δh) and entropy (δs) changes are because a process is more spontaneous when entropy and enthalpy are increased.

The change inside the disorderedness of a reactant to produce the product is defined by the entropy change of such a reaction, S.

Both enthalpy (δh) and entropy (δs) changes are -

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Answer:

1 mm = 0.1 mV; 5 mm = 0.5 mV (or between 2 dark horizontal lines); 10 mm = 1.0 mV. Heart rate ... QRS complex is a series of wave forms following P wave.

Explanation:

Hoped I helped

Answer:

A

Explanation:

Because we need clean water to obtain a healthy diet, need oxygen which plants provide through photosynthesis and soil is important for food.

The factor of safety for the slope stability analysis needs to be determined for a regolith slope in central California. The parameters provided include regolith cohesion, angle of internal friction, and regolith density. The analysis involves evaluating the stability of the slope under different conditions, such as changes in water depth, angle of internal friction, and slope steepness. Recommendations for the homeowners regarding the safety of their homes and potential remediation measures will also be provided.

To calculate the factor of safety, we need to consider the forces acting on the slope. The driving force is the weight of the regolith, which can be calculated by multiplying the density of the regolith by the volume of the slope. The resisting force is the shear strength of the regolith, which is determined by the cohesion and angle of internal friction. The factor of safety is the ratio of the resisting force to the driving force.

a. To determine the factor of safety, we can use the given parameters and calculate the driving force and resisting force. By dividing the resisting force by the driving force, we can obtain the factor of safety. If the factor of safety is greater than 1, it indicates that the slope is stable. If it is less than 1, the slope is considered potentially unstable.

b. If the water depth increases by 2 m, it adds additional weight to the slope, increasing the driving force. This decrease in the factor of safety suggests a less stable slope compared to the initial scenario.

c. If the angle of internal friction increases by a factor of 2, it enhances the shear strength of the regolith. This increase in the factor of safety indicates a more stable slope.

d. If the slope becomes steeper by a factor of 2, it increases the driving force. This decrease in the factor of safety suggests a less stable slope.

e. Based on the analysis, it is important to advise the homeowners that the slope is currently unstable, considering the factor of safety is less than 1. Remediation measures may include slope stabilization techniques such as installing retaining walls, soil reinforcement, or drainage systems to manage water infiltration and reduce driving forces. It is recommended to consult with a geotechnical engineer to develop a comprehensive slope stability plan for the safety of the home.

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Answer:

Vinegar is a homogenous mixture of acetic acid and water. As the mixture created has only one phase it is a solution. ... There are no chemical bonds created between water and the acid and it is possible to separate the two without breaking any chemical bonds.

Explanation:

Answer:

68.12 ft/s

Explanation:

assuming that the acceleration is correct

Given

a = 3.01 ft/s²

time elapsed, t = 8.5s

initial velocity, u = 29 mi/h = 42.533 ft/s

final velocity, v = we are asked to find this

recall that one of the equations of motions can be expressed as:

v = u + at, where v, u, a and t are defined as above

simply substitute the known values above into the equation;

v = u + at

v = 42.533 + (3.01)(8.5)

v = 68.12 ft/s

Explanation:

We know that :

u = 29 mph = 12.96 m/s

a = 3.01 ft/s^2 = 0.92 m/sec^2

t = 8.5sec

v = u + at

V = 12.96 + 0.92 * 8.5

v( final velocity) = 20.78 m/s = 68.17 ft/s

Answer:

0.11 m

Explanation:

speed is equal to wavelength multiplied by frequency

So, 32= w × 288

32/288= 0.11

Answer:

9 m/s

Explanation:

speed = distance ÷ time

27÷3

=9

The height of the oil column above the water in the vessel is determined as 2 cm.

The pressure of the vessel due to water, oil and silver poured into the vessel is determined from mercury column.

let level of mercury = 20 cm + 0.5 cm = 20.5 cm

20.5 cmHg = 205 mmHg

1 mmHg = 133.32 Pa

205 mmHg = 27,330.6 Pa

P = ρgh

where;

ρ is the density of water, oil and silver respectively

ρ = 1000 kg/m³ + 881 kg/m³ + 10,800 kg/m³ = 12,681 kg/m³

h = P/(ρg)

h = (27,330.6) / (12,681 x 9.8)

h = 0.22 m

h = 22 cm

Oil is less dense than water and will float on water.

Height of oil column = 22 cm - 20 cm = 2 cm

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Answer:

10 m/s²

Explanation:

Since the body is falling freely from the rest, it will be having an acceleration equal to the acceleration due to gravity.

∴ Acceleration = g = 9.8 m/s². ≈ 10 m/s².

Answer:

10 m/s^2 I hope it helps u a lot

Answer:

d = 11.77 m

Explanation:

Given that,

A ball is droped off the side of a bridge after 1.55 seconds.

We need to find how far it has fallen.

It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²

Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :

\(d=ut+\dfrac{1}{2}at^2\)

Put u = 0 and a = g

So,

\(d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m\)

Hence, it will fall at a distance of 11.77 m.

Answer:

-11.77!!!! DONNT FORGET NEGATIVE

Explanation:

The following statements are true: The time of the jump increases when g is smaller. The gravitational acceleration, denoted as g.

The time of the jump decreases when g is smaller.

The time of the jump refers to the duration of the jump, the time it takes for the object to reach the ground.

The gravitational acceleration, denoted as g, affects the time of the jump.

When the gravitational acceleration is smaller (on a planet with lower gravity), the object takes longer to reach the ground, resulting in an increased time of the jump.

Conversely, when the gravitational acceleration is larger (on a planet with higher gravity), the object falls faster, leading to a shorter time of the jump.

The other statements in the options are incorrect:

The displacement (horizontal distance traveled) does not depend on the time of the jump. It is determined by the initial velocity and the angle of projection, but not by the duration of the jump.

Increasing the time of the jump does not have any effect on the displacement. The horizontal distance traveled remains the same as long as the initial velocity and angle of projection are unchanged.

Therefore, the correct statements are:

The time of the jump increases when g is smaller.

The time of the jump decreases when g is smaller.

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Answer:

Tt can be calculated by copy

Let the mass of particle A be denoted as \(m_{A}\)and the mass of particle B as \(m_{B}\). Given that m_A = 2\(m_B\), we can express the total kinetic energy of the system after the energy transfer as follows:

Total kinetic energy = Kinetic energy of particle A + Kinetic energy of particle B

Since all the energy stored in the spring is transferred to the particles, the total kinetic energy is equal to the initial potential energy stored in the spring, which is 121 J. Therefore, we have:

121 J = Kinetic energy of particle A + Kinetic energy of particle B

Now, let's assign variables for the kinetic energies of the particles: \(K_A\) for particle A and \(K_B\) for particle B. We can express the equation as:

121 J = \(K_A\) + \(K_B\)

We also know that the mass of particle A (\(m_A\)) is 2 times the mass of particle B (\(m_B\)), so we can write:

\(K_A\)= (1/2) \(m_A\) \(v_A^2\) (1)

\(K_B\) = \(m_B\\\)\(v_B^2\)(2)

where \(v_A\) and \(v_B\\\) are the velocities of particles A and B, respectively.

Substituting equation (1) and equation (2) into the equation 121 J = \(K_A\) + \(K_B\), we get:

121 J = (1/2) \(m_A v_A^2 + m_B v_B^2\)

Since mA = 2mB, we can rewrite the equation as:

121 J = (1/2) (2\(m_B) v_A^2 + m_B v_B^2\)

Simplifying the equation, we have:

121 J = \(m_B (v_A^2 + v_B^2)\)

We don't have enough information to determine the specific values of \(v_A\) and \(v_B\) or the masses of the particles. Therefore, we cannot calculate the exact kinetic energies of particles A and B. The answers would depend on the specific values of mass and velocity for each particle.

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The uncertainty in the length measurement, δL, should satisfy:

δL < (2πL√(L/g))

The uncertainty of the natural frequency due to the uncertainty in the length measurement can be estimated using the formula for the natural frequency of a simple harmonic oscillator, which is given by:

f = 1 / (2π√(L/g))

where f is the natural frequency, L is the length of the oscillator, and g is the acceleration due to gravity. To calculate the uncertainty in the natural frequency, we can use the formula for propagating uncertainties:

δf = (∂f/∂L) * δL

Taking the derivative of the natural frequency formula with respect to L and assuming a small uncertainty δL in the length measurement, we have:

∂f/∂L = -1 / (2πL√(L/g))

Substituting this value into the uncertainty formula, we get:

δf = (-1 / (2πL√(L/g))) * δL

To ensure that the uncertainty is less than 1 Hz, we need to have:

|(-1 / (2πL√(L/g))) * δL| < 1

Therefore, the uncertainty in the length measurement, δL, should satisfy:

δL < (2πL√(L/g))

In practice, to ensure the uncertainty in the natural frequency is less than 1 Hz, it is necessary to have a precise and accurate length measurement with an uncertainty smaller than the calculated value.

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Answer:

sliding , static , rolling

Explanation:

HOPE IT WILL HELP YOU

Answer: 98cm

Explanation:

Dimension of rectangle = 30cm by 25cm

Length(l) = 30cm

Width(w) = 25cm

Perimeter of a rectangle = 2(l + w)

Quadrant of circle cut away of each side of the rectangle :

Radius = 7 cm =

That is, the dimension of the triangle reduces by 2 * 7 = 14cm

New length = 30 - 14 = 16cm

New width = 25 - 14 = 11cm

The four corners =( 4 × 2πr ) / 4

2πr = 2 × 22/7 × 7 = 44cm

Perimeter = 2(16cm + 11cm)

= 2(27cm)

Perimeter = 54cm + 44 = 98cm

Given:

There is a closed path for the flow of current.

Answer and explanation:

A correct option is an option (A). Since the path is closed, the current will flow through the circuit.

An option (B) is incorrect because the charge does not accumulate in a closed path.

Option (C) is also incorrect because the path is closed, and the circuit cannot be open.

Option (D) is also an incorrect option because there is always a resistance provided by the metal wire.

Answer: When you touch wet canvas, surface tension will draw water to your finger. However, the drop left behind where you touched, like any irregular point on an overhead surface, will draw condensation from inside the tent if it is humid.

Total Cost is =  $107,380 if The farm is 340 acres and had corn planted  add fertilizer to the soil before you plant this years' crop.

A fertiliser is a natural or artificial substance containing chemical elements (such as Nitrogen (N), Phosphorus (P) and Potassium (K)) that improve growth and productiveness of plants. Some synonyms include the terms "enrichment" or "plant nutrient".

Without fertilizers, nature struggles to replenish the nutrients in the soil. When crops are harvested, important nutrients are removed from the soil, because they follow the crop and end up at the dinner table. If the soil is not replenished with nutrients through fertilizing, crop yields will deteriorate over time.

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Explanation:

Given that,

The pilot directs the aircraft to fly due north at 600km/h.

A side-wind blows at  100km/h towards the east.

We need to find the aircraft's resultant velocity. et it be v. It can be calculated as follows :

\(v=\sqrt{600^2+100^2} \\\\v=608.27\ m/s\)

For direction,

\(\tan\theta=\dfrac{600}{100}\\\\\tan\theta=6\\\\\theta=\tan^{-1}(6)\\\\\theta=80.53^{\circ}\)

So, the aircraft's resultant velocity is 608.27 km/h and it is at and angle of 80.53°.