as a meter stick rushes past you (with a velocity v parallel to the stick), your measurement is 80 cm. what is the speed?

Answer:

1351.62 Watts.

Explanation:

The following data were obtained from the question:

Mass (m) = 79.5 kg

Height (h) = 2.29 m

Time (t) = 1.32 s

Acceleration due to gravity (g) = 9.8 m/s²

Power =?

Next, we shall determine the potential energy of the boy. This can be obtained as follow:

Potential energy (PE) = mass × acceleration × height

PE = m × g × h

Mass (m) = 79.5 kg

Height (h) = 2.29 m

Acceleration due to gravity (g) = 9.8 m/s²

Potential energy (PE) =?

PE = m × g × h

PE = 79.5 × 9.8 × 2.29

PE = 1784.139 J

Finally, we shall determine the power generated by Andrew as illustrated below:

Energy (E) = 1784.139 J

Time (t) = 1.32 s

Power (P) =?

P = E/t

P = 1784.139 /1.32

P = 1351.62 watts

Therefore, the power generated by Andrew was 1351.62 watts

a) The y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up is calculated to be -(1/2)g.  

b) The y-component of the ball's acceleration when its speed is half its terminal speed and it is moving back down is calculated to be -(3/2)g.

a) When the speed of the ball is half its terminal speed and it is moving back down, its velocity is also v = vt/2 = (1/2)mg/k.

At this moment, the drag force is positive because it opposes the direction of the velocity,

Fd = (1/2)mg

The acceleration of the ball is,

a = -g + (1/m)Fd = -g + (1/2g) = -(1/2)g

b) We can write, because the drag force is proportionate to the velocity v,

Fd = - kv

where,

k is constant

When the drag force equals the ball's weight and is directed in the opposing direction, the ball reaches its terminal velocity, which results in,

mg = k vt

where,

vt is the terminal velocity

Solving for vt, we get,

vt = mg/k

The ball's velocity is v = vt/2 = (1/2) mg/k when it is ascending at half its final speed. Currently, the pull force is

Fd = -(k/2)mg/k = -(1/2)mg

So, the acceleration of the ball is,

a = -g + (1/m) Fd = -g - (1/2)g = -(3/2)g

To know more about acceleration:

https://brainly.com/question/14861714

#SPJ4

The evidence which is an indication that a chemical reaction has occurred is the formation of a precipitate and is denoted as option B.

This is the referred to as the type of change which occurs when a new substance is formed and it involves a chemical reaction. Physical change on the pother hand doesn't involve the production of a new substance.

Chemical change in this scenario is a precipitate forming because it depicts a new substance and chemical reactions took place before it occurred which is therefore the reason why option B was chosen as the correct choice.

Read more about Chemical change here https://brainly.com/question/11231920

#SPJ1

To find the energy of the recoiling electron in units of keV, we can use the principles of Compton scattering and conservation of energy and momentum.

The change in wavelength (Δλ) of the X-ray photon due to Compton scattering can be calculated using the formula:

Δλ = λ' - λ = h / (m_e * c) * (1 - cos(θ))

where λ' is the wavelength of the scattered X-ray photon, λ is the wavelength of the incident X-ray photon, h is the Planck's constant, m_e is the mass of the electron, c is the speed of light, and θ is the scattering angle.

Using the energy-wavelength relationship for photons:

E = h * c / λ

we can relate the change in wavelength to the change in energy:

ΔE = E' - E = h * c / λ' - h * c / λ

For Compton scattering, the change in energy is given by:

ΔE = (E * (1 - cos(θ))) / (1 + (E / (m_e * c^2)) * (1 - cos(θ)))

Given that the incident X-ray energy (E) is 850 keV and the scattering angle (θ) is 52.0°, we can substitute these values into the equation to find the change in energy.

The energy of the recoiling electron is equal to the change in energy of the X-ray photon.

For question 24, we need to find the energy of the recoiling electron in units of keV. The result will be a numerical value that needs to be rounded to the nearest whole number.

For question 25, we need to find the de Broglie wavelength of the recoiling electron in units of picometers. The de Broglie wavelength can be calculated using the formula:

λ = h / (m_e * v)

where λ is the de Broglie wavelength, h is the Planck's constant, m_e is the mass of the electron, and v is the velocity of the electron.

To find the velocity of the recoiling electron, we can use the relativistic relationship between energy and momentum:

E = √((m_e * c^2)^2 + (p * c)^2)

where E is the energy of the electron, m_e is the mass of the electron, c is the speed of light, and p is the momentum of the electron.

Using the relationship between momentum and velocity:

p = m_e * v

we can solve for the velocity and then substitute it into the de Broglie wavelength equation to find the de Broglie wavelength of the electron.

For both questions 24 and 25, the given options provide possible numerical values. By performing the calculations as described above, you can determine which option matches the calculated result.

Know more about recoiling electron here:

https://brainly.com/question/31980770

#SPJ11

The acceleration of the crate after it begins to move is 0.5 m/s²

We'll begin by calculating the the frictional force

Mass (m) = 50 Kg

Coefficient of kinetic friction (μ) = 0.15

Acceleration due to gravity (g) = 10 m/s²

Normal reaction (N) = mg = 50 × 10 = 500 N

Fբ = μN

Fբ = 0.15 × 500

Frictional force (Fբ) = 75 N

Force (F) = 100 N

Fₙ = F – Fբ

Fₙ = 100 – 75

Mass (m) = 50 Kg

Net force (Fₙ) = 25 N

a = Fₙ / m

a = 25 / 50

Therefore, the acceleration of the crate is 0.5 m/s²

Learn more on friction: https://brainly.com/question/364384

Answer:D.carbon

Explanation:Protons are positively charged,neutron us nuetrally charged and electron is negatively charged and it contains a ne clues in the centre.

Answer:

Carbon

Explanation:

It is because Carbon is a relatively light element.

The stopping distance of the car is 49.9 m

The following data were obtained from the question:

The stopping distance can be obtained as illustrated below:

v² = u² + 2as

0² = 25.28² + (2 × -6.4 × s)

0 = 639.0784 - 12.8s

Collect like terms

-12.8s = 0 - 639.0784

-12.8s = -639.0784

Divide both sides by -12.8

s = -639.0784 / -12.8

s = 49.9 m

Thus, the stopping distance of the car is 49.9 m

Learn more about velocity:

https://brainly.com/question/3411682

#SPJ1

Answer:

the index of refraction of the coating is 1.33  

Explanation:

Given the data in the question;

refraction index of  interior portion of the rod η\(_{interior\) = 1.55

angle of incidence θ\(_i\) = 59.5°

From Snell's law, we know that;

η\(_{interior\) × sinθ\(_i\)  = η\(_{coating\) × sinθ\(_r\)

where η\(_{interior\)  is the index of refraction of the rod ( material 1 )

θ\(_i\)  is the angle of incidence

η\(_{coating\) is the index of refraction in outer coating ( material 2 )

θ\(_r\) is the angle of refraction

so we substitute our values into the equation;

η\(_{interior\) × sinθ\(_i\)  = η\(_{coating\) × sinθ\(_r\)

1.55 × sin( 59.5° )  = η\(_{coating\) × sin( 90° )

1.55 × 0.861629  = η\(_{coating\) × 1

1.3355 = η\(_{coating\) × 1

η\(_{coating\) = 1.33   { 2 decimal places }

Therefore, the index of refraction of the coating is 1.33  

The balance of centripetal and centrifugal forces acting on the object enables it to continue moving along the circular path.

There are two forces that act on the object as it is being swirled by the rope above the man's head. These two forces are;

When the centripetal force and centrifugal force are exactly balanced, the object remains in the circular path.

Learn more: https://brainly.com/question/2192784

The true statement according to Newton's laws of motion is; "there is no net force on the block during the 2nd second as zero net force keeps the motion constant."

According to the Newton first law of motion, an object will continue in its state of rest or uniform motion unless it is acted upon by a net force. The action of a net force leads to an acceleration.

In the 2nd second of the journey, there is no net force on the block hence the block continues to move at constant velocity.

Learn more: https://brainly.com/question/13678295

Answer: \(337.5\ N\)

Explanation:

Given

Energy associated with football is \(E=108\ J\)

The receiver takes 0.32 m to stop the ball

Suppose F is the force applied

\(\therefore W=F\cdot d\\\text{Insert the values}\\\\\Rightarrow 108=F\times 0.32\\\\\Rightarrow F=\dfrac{108}{0.32}\\\\\Rightarrow F=337.5\ N\)

Answer:

60 - 45 = A. 15

Explanation:

Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.

60 - 45 = A. 15. Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.

A flat or highly polished surface called a plane mirror reflects light or waves to create an image. It is a polished, smooth surface that creates a virtual representation of the actual object.

A plane mirror is a surface on which an image can only be produced by at least two light beams. The intersection of these two beams can occur inside the mirror or appear to occur somewhere behind the mirror.

The image that follows illustrates how an object appears when viewed via a plane mirror.

Therefore, 60 - 45 = A. 15. Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.

To learn more about Plane mirror, refer to the link:

https://brainly.com/question/13101215

#SPJ2

The number of formula units would be  2.5 x  \(10^2^3\)

This is mathematically given as: mole x Avogadro number

Molar mass of the aluminum sulfide (Al2S3) sample = 26.98 x 2 + 32.06 x 3

= 53.96 + 96.18 = 150.14 g/mole

Mole of 62.2 g aluminum sulfide = 62.2/150.14 = 0.4143 moles

Formular unit = 0.4143 x 6.023 x \(10^2^3\) = 2.5 x  \(10^2^3\)

More on formula units can be found here: https://brainly.com/question/21494857

#SPJ1

Answer:

1.positive velocity.

2.speeding up.

Answer: c living in a camber in an under water habitat

Explanation:

The observable (observable - something you can measure) stays constant in a series circuit, but in a parallel circuit is the current.

In a series circuit, the current is the same at all points in the circuit. However, in a parallel circuit, the current is divided among the different branches of the circuit. In a series circuit, the total resistance is equal to the sum of the individual resistances, and the current is equal to the voltage divided by the total resistance. This means that the current is the same at all points in the circuit, regardless of the number of components or their individual resistances.

In a parallel circuit, the total resistance is equal to the inverse of the sum of the inverses of the individual resistances, and the current is divided among the different branches of the circuit. This means that the current is not the same at all points in the circuit, and will vary depending on the number of components and their individual resistances. In summary, the current stays constant in a series circuit, but not in a parallel circuit.

Learn more about series circuit at:

https://brainly.com/question/23088951

#SPJ11

Answer:

577656.0

Explanation:

A balloon clings to a wall after it is negatively charged by rubbing because the wall is positively charged.

Yes, opposite charges attract each other. When a positive charge and a negative charge interact with each other, their forces act from the direction of positive to the direction of negative charge. As a result opposite charges attract each other while on the other hand, similar charges repel each other because their forces move in the opposite direction so they repel each other.

So we can conclude that a balloon clings to a wall after it is negatively charged by rubbing because the wall is positively charged.

Learn more about charge here: https://brainly.com/question/9317875

#SPJ1

Owing to the fact that planets orbits the sun at different speeds, Mars and Jupiter does appear to move backwards for some period of time. The geocentric model fails to explain this.

The geocentric model of the solar system is the approach that held the earth rather than the sun as the center of the solar system. The geocentric model was favored by most of the early astronomers.

However, as popular as the geocentric model of the solar system was, it failed to explain the phenomenon of retrograde motion which includes the apparent backward movement of Mars and Jupiter  for some period of time.

Learn more: https://brainly.com/question/6284546

Answer:

My guess is

Explanation:

C or Mars and Jupiter appeared to move backwards for some period of time

B or The stars appeared to move

Sorry if i'm wrong

The impulse response of the LTI system is h(t) = u(t).Let's find the output for the given input and impulse response using the integral definition of the convolution, given as follows:x(t) h(t) = ∫x(τ)h(t-τ)dτWe have to consider two cases when t < 0 and t ≥ 0.

Case 1:

Case 2:

we can evaluate the integral:

In signal processing and control theory, the impulse response, or impulse response function, of a dynamic system is its output when presented with a brief input signal, called an impulse. More generally, the impulse response is the reaction of any dynamic system in response to some external change.

Learn More About Impulse response at https://brainly.com/question/31964353

#SPJ11

Answer: An object with a greater mass requires a greater force to accelerate.

Explanation:

Answer:

An object with a greater mass requires a greater force to accelerate.

Explanation:

I took the test.

The correct prediction about the angular momentum and rotational kinetic energy of the sphere-rod system immediately before the collision and immediately after the collision is: Before the collision, the sphere has linear momentum (mass mo multiplied by velocity to) while the rod has zero angular momentum since it is at rest.

After the collision, the sphere and rod form a single system, and the conservation of angular momentum dictates that the final angular momentum of the system should equal the initial angular momentum of the sphere. Therefore, the sphere-rod system will have non-zero angular momentum after the collision.

Regarding rotational kinetic energy, before the collision, the sphere has linear kinetic energy (1/2 mo * to²) and the rod has zero rotational kinetic energy. After the collision, the sphere-rod system will have rotational kinetic energy (as they both rotate around the pivot with a common angular velocity). Due to the inelastic nature of the collision, some linear kinetic energy from the sphere will be converted to rotational kinetic energy in the sphere-rod system, but not all of it, as some energy will be lost as heat and sound during the collision.

More on angular momentum: https://brainly.com/question/30656024

#SPJ11

Answer:

To indicate short quotations (four typed lines or fewer of prose or three lines of verse) in your text, enclose the quotation within double quotation marks.

The linear acceleration of the bucket is\(-3.92 m/s^2\) and The angular acceleration of the pulley is\(-38.82 rad/s^2.\)

Acceleration due to gravity refers to the acceleration experienced by objects in the Earth's gravitational field. To solve this problem, we need to apply Newton's laws of motion to the system. First, we'll consider the forces acting on the bucket. Since it's falling freely, the only force acting on it is its weight, which is given by:

\(Fbucket = mbucket * g\)

where \(mbucket\) is the mass of the bucket and g is the acceleration due to gravity (\(9.81 m/s^2\)).

Next, we'll consider the forces acting on the pulley. There are two forces acting on the pulley: its weight and the tension in the rope connecting it to the bucket. Since the pulley is stationary (not accelerating in the vertical direction), the weight force is balanced by the tension force:

\(Ftension = Fweight pulley\)

\(mpulley * g = Ftension\)

where \(mpulley\) is the mass of the pulley.

The tension force is also responsible for the motion of the bucket and the pulley. The tension force causes an acceleration in the bucket, and since the rope is attached to the pulley, it also causes an angular acceleration in the pulley.

Part A:

To find the linear acceleration of the bucket, we'll use Newton's second law:

\(Ftension - Fbucket = mbucket * a\)

where a is the linear acceleration of the bucket.

Substituting\(Ftension\) and \(Fbucket\) and solving for a, we get:

\(mpulley * g - mbucket * g = mbucket * a\)

\(a = (mpulley - mbucket) * g / mbucket\)

\(a = (0.792 kg - 2.75 kg) * 9.81 m/s^2 / 2.75 kg\)

\(a = -3.92 m/s^2\) (The negative sign indicates that the bucket is accelerating downwards)

Therefore, the linear acceleration of the bucket is \(-3.92 m/s^2\).

Part B:

To find the angular acceleration of the pulley, we'll use the formula:

\(a = alpha * r\)

where a is the linear acceleration of the bucket (which we just found), alpha is the angular acceleration of the pulley, and r is the radius of the pulley.

Substituting the values and solving for alpha, we get:

\(alpha = a / r\)

\(alpha = -3.92 m/s^2 / 0.101 m\)

\(alpha = -38.82 rad/s^2\) (The negative sign indicates that the pulley is rotating clockwise)

Therefore, the angular acceleration of the pulley is\(-38.82 rad/s^2\).

Learn more about acceleration here:

https://brainly.com/question/12550364

#SPJ1

a)  the total energy of the cart at point B is 2400 Joules.

b)  the height of point A is approximately 1.83 meters.

(a) To find the total energy of the cart at point B, we need to consider both its kinetic energy and potential energy.

The kinetic energy (KE) of the cart can be calculated using the formula:

KE = (1/2)mv^2

where m is the mass of the cart assembly and passengers, and v is the speed of the cart.

Given:

Mass (m) = 300 kg

Speed (v) = 4 m/s

Plugging in the values, we get:

KE = (1/2) * 300 kg * (4 m/s)^2

KE = 2400 J

Next, we need to calculate the potential energy (PE) of the cart at point B. Since point B is on the ground, we can take the reference level as the ground level, where the potential energy is zero.

Therefore, at point B, the potential energy of the cart is zero.

The total energy (E) of the cart at point B is the sum of its kinetic energy and potential energy:

E = KE + PE

E = 2400 J + 0 J

E = 2400 J

Therefore, the total energy of the cart at point B is 2400 Joules.

(b) To determine the height of point A, we can use the conservation of energy principle. At point A, the cart has potential energy (PE) and kinetic energy (KE).

The total energy (E) of the cart at point A is the sum of its kinetic energy and potential energy:

E = KE + PE

Since the cart is at rest at point A (initially), its kinetic energy is zero:

KE = 0

Therefore, the total energy (E) at point A is equal to the potential energy (PE):

E = PE

Given:

Total mass (m) = 300 kg

Speed at point A (v_A) = 0 m/s

Speed at point C (v_C) = 6 m/s

Acceleration due to gravity (g) = 9.8 m/s²

Using the equation for potential energy:

PE = mgh

At point C, the cart has maximum kinetic energy and zero potential energy. Therefore, the total energy (E) at point C is equal to the kinetic energy (KE):

E = KE = (1/2)mv_C^2

Plugging in the values, we get:

E = (1/2) * 300 kg * (6 m/s)^2

E = 5400 J

Since energy is conserved, the total energy at point A is also 5400 J:

E = 5400 J

Equating the total energy at point A to the potential energy, we have:

PE = 5400 J = mgh

Rearranging the equation, we can solve for the height (h):

h = PE / (mg)

h = 5400 J / (300 kg * 9.8 m/s²)

h ≈ 1.83 meters

Therefore, the height of point A is approximately 1.83 meters.

For more such questions on  total energy visit:

https://brainly.com/question/29581211

#SPJ11

A certain car with an accelerating rate of 0.59 m/s2 will take 5.30 s to go from a speed of 50 mi/h to a speed of 57 mi/h

The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:

t = (vf - vi) /a

Where:

Information about the problem:

By converting the velocity from mi/h to m/s, we get:

50 mi/h * (1609.34 m / 1 mi) * (1h / 3600 s) = 22.35 m/s

57 mi/h * (1609.34 m / 1 mi) * (1h / 3600 s) = 25.48 m/s

Applying the time formula, we have:

t = (vf - vi) /a

t = ( 25.48 m/s - 22.35 m/s) / 0.59 m/s2

t = 3.13 m/s  /0.59 m/s2

t =  5.30 s

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

Learn more about acceleration at: brainly.com/question/14344386

#SPJ4

Answer: Kinetic energy is the energy an object has because of its motion

(if it needs to be a one worded answer than just type motion)

The potential energy of an object depends on its mass and its height.

The law of conservation of energy states that energy can be neither created nor destroyed, but it can change its form.

Answer:Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.

As expressed by the equation, potential energy depends upon the mass and the height of the object. Any increase in these two quantities will lead to an increase in the amount of potential energy possessed by the object.

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.