A 250g ball falls vertically downward, hitting the floor with a speed of 3.5m/s and rebounding upward with a speed of 2.5m/s (a) find the change in the balls velocity. (b) find the change in the balls momentum.

Answer:59.3

Explanation:

The force due to gravity or weight is 582 N. The mass of a student  is 59.39 Kg.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Force = mass.acceleration

582 = m*9.8

m = 59.39 Kg.

The force due to gravity or weight is 582 N. The mass of a student  is 59.39 Kg.

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Salt dissolves in water to form saltwater. This kind of change is regarded as a chemical change.

A physical change is a kind of change in which only the physical properties of matter change. In a physical change, neither the composition nor the chemical nature of matter is changed.

A chemical change involves a chemical process that results in the production of new substances. When you dissolve salt in water the sodium chloride dissociates in Na+ and Cl- ions which can be written in the form of a chemical reaction as,

NaCl →  Na+(aq) + Cl-(aq)

Thus, dissolving salt in water is an example of a chemical change.

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The period of the simple harmonic oscillator is 2.00 s, the frequency is 0.500 Hz, and the corresponding angular velocity is 3.14 rad/s. The motion of a person swinging on a swing can be modelled as a simple harmonic oscillator.

The period, frequency, and angular velocity of the simple harmonic oscillator can be determined from the length of the swing and the acceleration due to gravity.

Let's calculate the period, frequency, and angular velocity of the simple harmonic oscillator in this problem. The period of a simple harmonic oscillator can be calculated using the following formula:

\(T = 2π√(l/g)\), where l is the length of the pendulum and g is the acceleration due to gravity.

The length of the pendulum can be determined as follows: Length of pendulum = Distance from pivot point to center of gravity of the person= 2.00 m. The acceleration due to gravity is approximately 9.81 m/s^2, so the period of the simple harmonic oscillator is

:\(T = 2π√(l/g)\)

= 2π√(2.00/9.81) = 2.00 s

The frequency of the simple harmonic oscillator is given by:

f = 1/T

= 1/2.00

= 0.500 Hz (correct to 3 significant figures)

The corresponding angular velocity is given by:

ω = 2πf

= 2π(0.500)

= 2π(0.500)

= 3.14 rad/s (correct to 3 significant figures)

Therefore, the period of the simple harmonic oscillator is 2.00 s, the frequency is 0.500 Hz, and the corresponding angular velocity is 3.14 rad/s.

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Answer:

A Magnet

Explanation:

Edge 2021

Answer:

The answer is the last option, A Magnet

Explanation:

The problem feature of the Milky Way's rotation that led to the proposal of dark matter is the observation that stars and gas in the outer regions of galaxies, including the Milky Way, are moving at unexpectedly high velocities, defying expectations based on visible matter alone.

The problem arises from the understanding of gravity and the laws of motion. Based on the visible matter observed in galaxies, such as stars and gas, the expected velocities of objects in the outer regions should decrease as their distance from the galactic center increases.

However, observations have shown that the velocities remain relatively constant or even increase, indicating the presence of additional mass not accounted for by visible matter.

To explain this discrepancy, scientists hypothesized the existence of dark matter, which is an invisible and as-yet-undetected form of matter that does not interact with light but exerts gravitational effects.

The presence of dark matter can explain the observed high velocities in the outer regions of galaxies, including the Milky Way, and reconcile them with our understanding of gravity and motion.

Therefore, the unexpected high velocities of stars and gas in the outer regions of galaxies, including the Milky Way, challenged expectations based solely on visible matter, leading to the proposition of dark matter.

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Answer:

4) Coefficent in science

Answer:

South ....................

Answer:

South ;)

Explanation:

I just did it .

Answer:

who done work in less time will have more power

Explanation:

Thermogenesis has been studied the plants in the genus arum, including skunk cabbage and the corpse flower. In these plants, these hypotheses have been provided to explain the reason behind thermogenesis

Thermogenesis, which takes place in specialised tissues such brown adipose tissue and skeletal muscle, is described as the disposal of energy through the generation of heat.

All metabolic activities involved in keeping the organism in a live condition require mandatory thermogenesis, which takes place in all organs. It also includes the energy used when food is consumed, digested, and processed (thermic effect of food, or TEF).

Thus, the reason behind thermogenesis are:

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A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

When an object is moved over a distance by an external force, at least a portion of that force must be applied in the direction of the displacement.

By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea.

The work is W = fd cos if the force is applied at an angle of to the displacement. Performing work on a body involves moving it in its entirety from one location to another as well as.

Therefore, A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

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After connecting the conducting wire, the spheres will redistribute charges until they both have a charge of -1C.

To determine the new charges on the spheres, we need to consider the principle of charge conservation, which states that the total charge before and after an interaction remains the same.

Let's assume that the spheres have charges Q1 and Q2 initially. In this case, Q1 = -3C and Q2 = +1C.

When a conducting wire is connected between the spheres, charge can redistribute until the system reaches equilibrium. Since the spheres are conducting, charges are free to move within them.

In the final state, the charges on the spheres will redistribute to reach a new equilibrium. Let's assume the new charges on the spheres are Q1' and Q2'.

According to the principle of charge conservation, the total charge before and after the connection remains the same:

Initial total charge = Q1 + Q2 = -3C + 1C = -2C

Final total charge = Q1' + Q2'

Since the total charge remains the same, we can write the equation:

Q1' + Q2' = -2C

Since the spheres are of equal size, we can assume that the charges redistribute equally:

Q1' = -1C

Q2' = -1C

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The question probable may be:

A conducting wire is connected between two conducting spheres of equal size have a charge of -3C and +1C respectively. Find out the new charge on each sphere ?

Answer:

\(ke = \frac{1}{2} mv {}^{2} \)

Answer:

1 4.5 divede by 1.29 I think that is the literal answer

Momentum is conserved, so the sum of the momenta of the bullet and block before collision is equal to the momentum of the combined bullet-block system,

\(m_bv_b+m_wv_w = (m_b+m_w)v\)

where v is the speed of the bullet-block system. The block starts at rest so it has no initial momentum, and solving for v gives

\(v = \dfrac{m_b}{m_b+m_w} v_b\)

The total work W performed by the spring on the bullet-block system as it is compressed a distance x is

\(W = -\dfrac12kx^2\)

where k is the spring constant, and the work done is negative because the restoring force of the spring opposes the bullet-block as it compresses the spring.

By the work-energy theorem, the total work done is equal to the change in the bullet-block's kinetic energy ∆K, so we have

\(W_{\rm total} = W = \Delta K\)

The bullet-block starts moving with velocity v found earlier and comes to a stop as the spring slows it down, so we have

\(-\dfrac12kx^2 = -\dfrac12(m_b+m_w)v^2 \implies kx^2 = \dfrac{{m_b}^2}{m_b+m_w}{v_b}^2\)

Solve for \(m_w\):

\(m_w=\dfrac1k\left(\dfrac{m_bv_b}x\right)^2-m_b\)

\(m_w=\dfrac1{205\frac{\rm N}{\rm m}}\left(\dfrac{(0.0135\,\mathrm{kg})\left(245\frac{\rm m}{\rm s}\right)}{0.350\,\rm m}\right)^2-0.0135\,\mathrm{kg}\approx \boxed{0.422\,\mathrm{kg}}\)

The metal has a resistance of 5.0x10-8 ohm x m.

Given: radius=1cm , resistance=3.2x10¬⁵ω .

Using ohms () as the unit, resistance acts as a gauge to quantify how easily current will flow through a circuit. When resistance falls, current rises, and when resistance rises, current falls. In order to make sure that current is flowing in circuits at the proper rate, resistors are crucial.

When electricity flows through with a conducting, such a metal wire, an electric current occurs. The electrons in the metal may clash with the travelling electrons. Resistance is created as a result, making it harder for current to flow.

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The parameters used in determining the Reynolds number according to boundary layer theory are velocity, characteristic length, and kinematic viscosity.

The Reynolds number (Re) is a dimensionless quantity used to determine the type of flow (laminar or turbulent) in a fluid. It is calculated using the formula Re = (ρ * V * L) / μ, where ρ is the density of the fluid, V is the velocity of the flow, L is a characteristic length, and μ is the kinematic viscosity of the fluid.

The velocity and characteristic length are important in describing the flow conditions, while the kinematic viscosity represents the fluid's resistance to deformation. The Reynolds number helps in predicting the behavior of the fluid flow, with low values indicating laminar flow and high values indicating turbulent flow.

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Answer:

F_{resultant} = 1 [m/s]

Explanation:

These types of problems can be solved by means of relative velocities, where vectors (forces or velocities) are necessarily handled, these velocities depending on the velocity are added or subtracted.

Forces to the right are taken as positive and negative to the left.

\(F_{velocity}-F_{air}=F_{resultant}\\2-1 = F_{resultant}\\\\F_{resultant} = 1 [m/s]\)

When converting the measured magnitude to dB, plot the experimental magnitude (dB) and phase (deg) points on the calculated Bode plot to compare theory and experiment.

To convert the measured magnitude to dB, use the formula: dB = 20 * log10(magnitude). Next, plot the experimental magnitude (dB) and phase (deg) points on the calculated Bode plot by hand to compare the theoretical and experimental results.

Analyze the differences and similarities to draw conclusions about the system's behavior. When increasing the mechanical damping near the natural frequency, the amplitude will decrease, and the phase shift will change due to the energy dissipation in the system. This occurs because increased damping reduces the system's response to external forces and alters the phase relationship between input and output.

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Answer:

can you take a picture of the whole paper so I can see exactly what else it says so I can figure out the solution the only thing I see is wave speeds and speed of the sounds and distance and frequency

Answer:

2 meters

Explanation:

In oceanography, the term "wave height" refers to the vertical distance between the crest (the highest point) and the trough (the lowest point) of a wave. If you are situated in the trough of a wave, the wave height would be double the wave amplitude.

In this case, you mentioned that the wave amplitude is 1 meter. Therefore, the wave height from your position in the trough would be 2 meters.

From the information the saturation mixing ratio (ws) is approximately 0.000161 g \(kg^-1\)

To calculate the saturation mixing ratio (ws), we need to use the given information of specific humidity (w) and relative humidity (RH). The saturation mixing ratio represents the maximum amount of water vapor the air can hold at a given temperature.

The formula to calculate ws from w and RH is as follows:

ws = w ÷ (1 - w) × RH ÷ 100

Given:

w = 8 g \(kg^-1\)

RH = 20%

First, we need to convert w from grams per kilogram to a decimal fraction:

w = 8 ÷ 1000 = 0.008

Now we can substitute the values into the formula:

ws = 0.008 ÷ (1 - 0.008) × 20 ÷ 100

Calculating this expression:

ws = 0.008 ÷ 0.992 × 0.20

ws ≈ 0.000161 g \(kg^-1\)

Therefore, the saturation mixing ratio (ws) is approximately 0.000161 g \(kg^-1\).

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Answer:

we have to apply force to move something things wants to save their position and if we want to change it

we have too apply force

Answer:

we have to apply

them to have a answer

Answer:

The correct option is B.

Codorminance.

Explanation:

The type of inheritance pattern is codorminance because in codorminance the two alleles in the gene are expressed, no allele was able to masked the express on the other allele. The chestnut colored horse allele is expressed likewise the white

colored allele too is expressed none of the two alleles mask the Expression of the other, the two are expressed to give offsprings roan colored which is an indication of the two expression.

Answer:

Codominance

Explanation:

Answer:

1. It will reach a height of 31.877m

2. 5.102 seconds

3. -11.456 m/s

Explanation:

Answer: 11.25 ft

Explanation:

The current winning team’s final score at the shot put was 52.08 ft.

In order to tie the score Miguel's team must equal the above score.

The total score before Miguel's throw was

12.26+12.82+13.75= 38.83 ft

52.08-38.83= 11.25 ft is needed in order to tie the score.

The spring stiffness, or spring constant, of the given perfect spring is approximately 137.9623 N/m. This means that for every meter of extension, the spring will exert a force of 137.9623 N.

This value was obtained by applying Hooke's Law and calculating the ratio of the change in force to the change in extension using two data points from the table.

To determine the spring stiffness, we need to calculate the spring constant (k) using Hooke's Law, which states that the force applied on a spring is directly proportional to the extension it undergoes.

Hooke's Law can be represented as F = kx, where F is the applied force and x is the extension of the spring.

In the given table, we have the applied forces (F) and corresponding extensions (x). We can use any two data points from the table to find the spring constant.

Let's choose the first and last data points from the table:

(x1, F1) = (0.43 m, 59.34 N) and (x2, F2) = (0.96 m, 132.48 N).

Using Hooke's Law, we can calculate the spring constant (k) as follows:

k = (F2 - F1) / (x2 - x1)
  = (132.48 N - 59.34 N) / (0.96 m - 0.43 m)
  = 73.14 N / 0.53 m
  ≈ 137.9623 N/m (rounded to 4 decimal places)

Therefore, the spring stiffness, or spring constant, is approximately 137.9623 N/m.

Hooke's Law is a fundamental concept in physics that describes the relationship between the force applied on a spring and the resulting extension it undergoes.

The formula F = kx represents this relationship, where F is the applied force, k is the spring constant, and x is the extension of the spring.

By using two data points from the table, we can calculate the spring constant by finding the ratio of the change in force to the change in extension.

This calculation allows us to quantify the stiffness of the spring.
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i. The change in the velocity of the car is 12 m/s

ii. The acceleration of the car is 0.2 m/s²

The change in the velocity of the car can be obtained as follow:

Change in velocity = Final velocity - initial velocity

= 32 - 20

= 12 m/s

The acceleration of the car can be obtained as illustrated below:

Acceleration = change in velocity / time

= 12 / 60

= 0.2 m/s²

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