A 63.0 kg skier starts from rest at the top of a ski slope 70.0 m high. Part A If frictional forces do -11.0 kJ of work on her as she descends, how fast is she going at the bottom of the slope? Express your answer in meters per second to three significant figures. ΨΗ ΑΣφ ? m/s Submit Request Answer Part B Now moving horizontally, the skier crosses a patch of soft snow where we = 0.24. If the patch is 82.0 m wide and the average force of air resistance on the skier is 170 N, how fast is she going after crossing the patch? Express your answer in meters per second to three significant figures. ΡΟ ΑΣφ ? Part The skier hits a snowdrift and penetrates 3.0 m into it before coming to a stop. What is the magnitude of the average force exerted on her by the snowdrift as it stops her? Express your answer in newtons to three significant figures. VAX¢ ? F- N

Our most detailed knowledge of Uranus and Neptune comes from spacecraft exploration. NASA's Voyager 2 spacecraft was the first and only spacecraft to fly by both Uranus and Neptune, providing us with a wealth of data and images of these distant gas giants.

The spacecraft conducted numerous flybys, capturing detailed images and measurements of their atmospheres, magnetic fields, and moons. The Hubble Space Telescope has also contributed to our understanding of Uranus and Neptune, but its observations have been more limited compared to the data obtained from spacecraft. Ground-based visual and radio telescopes have also been used to study these planets, but their observations are limited by the Earth's atmosphere. Manned missions have not yet been sent to explore Uranus or Neptune.

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Answer:

D

Explanation:

Answer:

it has most potential at highest point (not in space), But kinetic at lowest

Answer: When the ball is highest in the air it has the most potential energy and it has the most kinetic energy when it is about to hit the ground thats when it is moving fastest.

The angle A between  \(a=4.0i+5.0j\) and \(b=-3.0i+4.0j\) using the dot product a · b = |a| |b| cos Θ is 75.58°.

To find the angle A between two vectors, we can use the dot product formula:

a · b = |a| |b| cos Θ

Given:

\(a=4.0i+5.0j\\b=-3.0i+4.0j\)

First, let's calculate the dot product of a and b:

a · b = (4.0 * -3.0) + (5.0 * 4.0)

= -12.0 + 20.0

= 8.0

Now, find the magnitudes of vectors a and b:

|a| = √(4.0² + 5.0²)

= √(16.0 + 25.0)

= √41.0

|b| = √((-3.0)² + 4.0²)

= √(9.0 + 16.0)

= √25.0

= 5.0

Now, we can substitute these values into the dot product formula to solve for the cosine of the angle:

8.0 = (√41.0)(5.0) cos Θ

cos Θ = 8.0 / (5.0√41.0)

cos Θ = 0.249

Θ = cos⁻¹(0.249)

Θ = 75.58°.

Therefore, the angle A between the vectors a and b is approximately  75.58 degrees.

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The tension force on the string with a ball of mass 3.56 kg attached to it is 35 N.

Tension force is defined as the force transmitted through a rope, string or wire when pulled by forces acting from opposite sides.

To calculate the tension force in the string, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the tension force on the string is 35 N.

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The number of bit strings of length 9 that begin with five 0's is 2^4, which is equal to 16.

In binary representation, a bit string can have two possibilities for each bit position: 0 or 1.

Since we want a bit string of length 9 that begins with five 0's, the remaining four positions can be filled with either 0 or 1.

Therefore, we have 2 options for each of the four remaining positions, resulting in a total of 2^4 = 16 possible bit strings.

To illustrate this, consider that the first five positions are fixed as 0, and the remaining four positions can be filled in any combination of 0's and 1's. For example, valid bit strings could be 000001111, 000001001, 000000110, etc.

Hence, if a bit string of length 9 begins with five 0's, there are 16 possible combinations for the remaining positions.

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Answer: The spinning of Earth's outer core causes the lithosphere to break into individual plates and collide with each other.

Earth's surface forms because of this reason:

The spinning of Earth's outer core causes the lithosphere to break into individual plates and collide with each other.

Answer:

B my brother say that it was

The distance covered by the swimmer in the given time is 0.417 km.

Velocity of the river, v₁ = 4 km/hr

Velocity of the swimmer, v₂ = 3 km/hr

Time taken by the swimmer for swimming, t = 5 minutes

A relative motion velocity is the speed at which one thing is moving in relation to another item, which may be stationary, moving at a constant speed, moving slowly, moving at a greater speed, or moving in opposite directions.

The magnitude of the resultant velocity of the river and the swimmer is given by,

v = √(v₁²+ v₂²)

v = √(4²+ 3²)

v = √(16 + 9)

v = √25

v = 5 km/hr

Therefore, the distance covered by the swimmer in the given time is,

d = v x t

d = 5/60 x 5

d = 25/60

d = 0.417 km

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A. The difference between the quantities that have vector drawings and the ones that don't is that the vector drawings represent physical quantities that have a direction, such as velocity, momentum, and force.

Vector drawings are digital images created using mathematical equations that define geometric shapes, lines, curves, and other objects. Vector drawings are composed of paths, which are the lines, curves, and shapes that make up the artwork.

b. In an elastic collision, the total energy and momentum of the colliding objects remain the same before and after the collision.

c. Quantities that have the same value (and direction if a vector) before and after the collision are momentum, kinetic energy, and velocity.

d. Quantities that are not conserved are total energy, momentum, and angular momentum.

e. To check my answers, I could run another experiment using objects of different masses to see if the momentum and kinetic energy remain the same after the collision.

a. No changes need to be made to my definition of elastic collision from 2b.

b. When the elasticity is varied, the momentum and kinetic energy remain the same before and after the collision, but the total energy may not.

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Answer:

The geosphere consists of the solid Earth and the atmosphere consists of the gaseous components in the air. Thus, the answer is C.

Explanation:

Answer:

C

Explanation:

The interiors of Saturn and Jupiter contain a large amount of large metallic hydrogen because liquid hydrogen transforms into liquid metallic hydrogen as one descends, reaching a depth of 12,000 kilometers as the radius of Jupiter is 71,000 kilometers the hydrogen is below the cloud layers.

Helium and hydrogen make up the majority of the atmospheres of Jupiter and Saturn. The hydrogen changes from a high-pressure gas to liquid hydrogen a few hundred kilometers below the cloud levels. It would take some fairly intense pressures to create this on Earth, but it is possible. It's a component of rocket fuel.

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Answer:

First you need to know the mass (grams) of the object and its volume, then what you do is  Divide the mass by the volume in order to get an object's Density.

Explanation:

hope that helped good luck :)

Answer:

m/p, aka mass/volume.

Explanation:

for example if you had an object that had a mass of 10 and volume of 5, the density of that object would be 10/5, or 2.

It is shaped like a pinwheel describing a spiral galaxy. A flat, rotating disk containing stars, gas, and dust, as well as a central concentration of stars known as the bulge, makes up most spiral galaxies.

Spiral galaxies are a type of galaxy first described by Edwin Hubble are part of the Hubble sequence.

A flat, rotating disk containing stars, gas, and dust, as well as a central concentration of stars known as the bulge, makes up most spiral galaxies.

Many of these are surrounded by a fainter halo of stars, many of which are found in globular clusters.

The Pinwheel Galaxy is a spiral galaxy located approximately 21 million light-years from Earth. M101 is the name given to this swirling galaxy by scientists.

In the Northern Hemisphere, it can be found in the constellation Ursa Major, also known as the "Big Dipper." Binoculars or a small telescope can be used to see if the sky is clear and dark.

Hence it is shaped like a pinwheel describing a spiral galaxy.

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Answer:

Explanation:

v=u+at

30=0+a×12

30=12a

a=\(\frac{30}{12}\)

a=2.5ms⁻²

The correct option is d. -2.738 V.

We know that, E°cell = E°cathode – E°anodeIn this question, we need to calculate the potential of an aluminum electrode immersed in 0.05 M KOH solution saturated with Al(OH)3. Let us consider the half-reactions occurring at the cathode and anode.2Al(OH)3(s) + 6OH-(aq) ⇌ 2[Al(OH)6]3-(aq) (cathode)Al(s) + 3OH-(aq) ⇌ [Al(OH)3]-(aq) + 3e- (anode). On balancing the above reactions we get:2Al(OH)3(s) ⇌ Al(s) + 3[Al(OH)4]- (aq) + 3OH-(aq). By applying the Nernst equation, we get: For cathode: E°cathode = 0V (Since it is given that Al(OH)6 is saturated). For anode: E°anode = - (0.0592/3) log10{([Al(OH)4]-]^3/[Al][OH^-]^3)}E°anode = - (0.0592/3) log10{([Al(OH)4]-]^3/[OH^-]^3}E°anode = - (0.0592/3) log10(1.8 × 10^-12)E°anode = 1.076V. On substituting the values of E°cathode and E°anode in the formula of E°cell, we get E°cell = E°cathode – E°anodeE°cell = 0 - 1.076 VE°cell = -1.076 V. We know that the potential of the electrode is equal to the standard potential of the electrode plus the electrode potential calculated from the Nernst equation. potential of the aluminum electrode = -1.662 + (-1.076) = -2.738 V. Therefore, the correct option is d. -2.738 V.

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Answer:

Sustainable energy is essential to meet uncontrolled rising demand for energy, reduce pollution and shift to resources that can be used again and again.

Explanation:

Considering the Sustainable Goals floated by United Nation, it is essential for all countries to improve their score in all the SD goals.

One of the SD goal is to shift to sustainable energy.

Sustainable energy is essential from following three points

- Reuse of energy source again and again to outcome the fear of resource depletion

- Sustainable energy source shall ensure cleaner environment

- Sustainable energy sources are also essential to meet the rising consumption of energy with time all across the globe.

Some common examples are - Solar energy, Wind Energy, Energy from nuclear fuels etc.

Answer:

1) C. 2.5 x 10⁴ Pa

2) C. 75 cm³

Explanation:

Question 1.

Given the following data;

To find the final pressure, P2, we would use Boyle's law;

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

PV = K

P1V1 = P2V2

Making P2 the subject of formula, we have;

P2 = (P1V1)/V2

Substituting into the formula, we have;

P2 = (1 * 10⁵ * 5)/20

P2 = (500,000)/20

Final pressure, P2 = 25,000 Pa or 2.5 x 10⁴ Pa.

Question 2.

Given the following data;

To find the final volume, we would use Boyle's law;

Mathematically, Boyles law is given by;

PV = K

P1V1 = P2V2

Making V2 the subject of formula, we have;

V2 = (P1V1)/P2

Substituting into the formula, we have;

V2 = (190 * 30)/76

V2 = 5700/76

Final volume, V2 = 75 cm³

Answer:

To use Snell's law to find N1, we need to know the indices of refraction and angles of incidence and refraction of the two media.

Snell's law states that:

n1 sin(theta1) = n2 sin(theta2)

where n1 and n2 are the indices of refraction of the two media, theta1 is the angle of incidence, and theta2 is the angle of refraction.

We are given n2=2.61, theta1=40°, and theta2=34°. To find N1, we need to rearrange Snell's law to solve for n1:

n1 = n2 sin(theta2) / sin(theta1)

Plugging in the values we have:

n1 = 2.61 sin(34°) / sin(40°)

n1 ≈ 2.22

Therefore, the index of refraction of the first medium (N1) is approximately 2.22, based on the given values and Snell's law.

The magnitude of the electric field if the electron just misses the top plate is 364 N/C.

Time taken by electron is given as

t = x / Vo

t = distance / speed

where, Vo = velocity = 1.6 × 10⁶ m/s

x = distance = 2 cm = 0.02 m

t = 0.02 / 1.6 × 10⁶ m/s = 1.25 × 10⁻⁸ s

acceleration of electron is given as :

a = (2 × y )/ t²

y = vertical distance

a = ( 2 × 0.01 / 2) /  (1.25 × 10⁻⁸ )²

a = 6.4 × 10¹³ m/s²

the electrical field expression is given as :

E = ( ma ) / q

E = (

E = 9.1 × 10⁻³¹ × 6.4 × 10¹³ ) / 1.6 × 10⁻¹⁹

E = 364 N /C

thus,  The magnitude of the electric field if the electron just misses the top plate is 364 N/C.

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The kinetic energy for photons can not be determined while the kinetic energies for electrons, neutrons, and α particles are  3762 eV, 130 eV, and 8.08 eV respectively.

(a) For photons, the de Broglie wavelength is not related to their kinetic energy, as they do not have mass. Therefore, we cannot determine the kinetic energy of a photon using its de Broglie wavelength.

(b) To find the kinetic energy of electrons with a de Broglie wavelength of 0.14 nm, we use the formula:

E = h^2 / (2 * m_e * λ^2)
where E is the kinetic energy, h is the Planck's constant (6.626 x 10^-34 Js), m_e is the electron's mass (9.11 x 10^-31 kg), and λ is the de Broglie wavelength (0.14 nm or 1.4 x 10^-10 m).

E ≈ 6.026 x 10^-19 J or 3762 eV

(c) For neutrons with a de Broglie wavelength of 0.14 nm, we use the same formula but replace m_e with the neutron's mass (1.675 x 10^-27 kg).

E ≈ 2.088 x 10^-22 J or 130 eV

(d) For α particles (helium nuclei) with a de Broglie wavelength of 0.14 nm, we again use the same formula but replace m_e with the α particle's mass (6.646 x 10^-27 kg).

E ≈ 1.293 x 10^-21 J or 8.08 eV

In summary, the kinetic energies are:
(a) Photons: Cannot be determined
(b) Electrons: 3762 eV
(c) Neutrons: 130 eV
(d) α particles: 8.08 eV

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Mugabe gained power by using political strategies, forming alliances, and exploiting his status as a liberation hero within ZANU-PF.

Robert Mugabe, the former president of Zimbabwe, was able to build power through a combination of political strategies and alliances. One key factor was his involvement in the liberation struggle against white minority rule in Rhodesia (now Zimbabwe).

Mugabe emerged as a prominent figure within the Zimbabwe African National Union (ZANU) party, which later merged with the Zimbabwe African People's Union (ZAPU) to form the Zimbabwe African National Union - Patriotic Front (ZANU-PF). Mugabe's role as a liberation hero and his ability to mobilize support among the majority black population of Zimbabwe gave him a strong power base.

Within ZANU-PF, Mugabe strategically positioned himself and gained influence by forming alliances and outmaneuvering rivals. He rose to become the party's leader and played a key role in negotiating the Lancaster House Agreement in 1979, which paved the way for Zimbabwe's independence in 1980. Mugabe became the country's first prime minister and later transformed the position into an executive presidency, consolidating his authority.

Mugabe maintained power through various means, including controlling key institutions such as the military, intelligence agencies, and the ruling party. He also utilized patronage networks, distributing resources and positions to loyal supporters within the party and government. Mugabe's policies, such as the controversial land reform program, further solidified his power base by appealing to nationalist sentiments and redistributing land from white farmers to black Zimbabweans.

However, Mugabe's consolidation of power was also marked by authoritarianism, human rights abuses, and a declining economy. His grip on power faced challenges over the years, including opposition movements, internal party factions, and economic crises. Ultimately, his rule came to an end in 2017 when he was ousted from power following a military intervention.

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The sound would have a wavelength of about  9.8 * 10^-3 m.

The wavelength is a characteristic of a wave that describes the distance between two successive points in the wave that are in phase, or the distance over which the wave's shape repeats. It is typically denoted by the Greek letter lambda (λ) and is measured in meters (m) or other units of length.

Given that the speed of sound in air is 343 m/s

v= λf

λ = v/f

λ =  343 m/s/3.5x10^4 Hz

λ =  9.8 * 10^-3 m

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Answer:

A. Mountains on different continents match up.

Explanation:

Due to the drifting/ moving apart of the continents, land masses is split therefore in case of a mountain that split, it matches the other part in another continent.

Answer:

Move. It also determines the total amount of force put on an object

Explanation:

The question is incomplete, the complete question is;

The net force determines how and if an object will?

A) make a balanced force

B) change its mass

C) move or accelerate

When unbalanced forces act on an  object, the object moves  or accelerates. The correct answer is option C: move or accelerate

Force is considered as a push or pull. Unbalanced forces refers to a system of forces acting in opposite direction and are not equal in magnitude.

Unbalanced forces cause an object to move or accelerate in the direction of the larger force.

Hence, The net or resultant force determines how and if an object will move or accelerate when under the action of unbalanced forces.

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The hydro power plant consists of a (artificial) dam that builds gravitational potential energy, P.E. from natural flowing water sources, by locating the dam along the water path. The stored potential energy, P. is converted into kinetic energy, K.E. as the water falls from the dam, down to the turbines, located at a much lower level according to the following principle of conservation of energy equation;

Total Mechanical Energy, M.E. = The potential energy of the water, P.E. + The kinetic energy of the water, K.E. = Constant

M.E. = P.E. + K.E. = Constant

Where;

P.E. = m·g·h

K.E. = (1/2)·m·v²

m = Mass

g = The acceleration due to gravity

h = The height of the dam

v = The velocity

The charts can be explained as follows;

Given that the potential energy P.E. = m·g·h, we have that the potential energy is directly proportional to the height of the dam, and therefore, at mid height, the potential energy would be half the maximum value, and we have;

At mid height, P.E. = (1/2)·\(\mathbf{P.E._{max}}\)

At the top of the dam, the (vertical) velocity of the water = 0, therefore, the kinetic energy = 0

Therefore, at the top of the dam, we get;

M.E. = \(P.E._{max}\) + 0 =

M.E. = \(\mathbf{P.E._{max}}\)

Similarly, at the bottom of the dam, the height, h = 0, therefore, being proportional to the height, P.E. = 0, and the velocity is maximum, and at the bottom, we have;

M.E. = 0 + \(K.E._{max}\)

The first chart, water is halfway down the dam

At the halfway down therefore, we have;

P.E. = (1/2)·\(\mathbf{P.E._{max}}\)

M.E. = \(P.E._{max}\) = (1/2)·

∴ K.E. = \(P.E._{max}\) - (1/2)·

Therefore the first chart, water is halfway down the dam;

Halfway, K.E. = (1/2)·\(\mathbf{P.E._{max}}\) = P.E.

∴ K.E. = P.E.  as shown on the chart

The second chart, water has reached the turbine

Water reaches the turbine at the bottom, and as explained above, we get;

M.E. = 0 + \(K.E._{max}\)

∴ M.E.≈ \(K.E._{max}\)

Therefore, when water has reached the turbine at the bottom of the dam, the kinetic energy is approximately proportional to the total mechanical energy as shown in the chart

The third chart, water is at the top of the dam

Here as shown above, we have;

The total mechanical energy, M.E. ≈ \(\mathbf{P.E._{max}}\) as shown on the chart

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The best description of the image produced by a flat mirror is:"The image formed by a flat mirror is virtual, upright, and laterally inverted."

When an object is placed in front of a flat mirror, the mirror reflects the light rays from the object. The reflected rays appear to originate from behind the mirror, creating a virtual image. The image appears upright, meaning it has the same orientation as the object. However, the image is laterally inverted or reversed from left to right compared to the actual object.

The virtual image formed by a flat mirror has the same size as the object, as there is no magnification involved. The image appears to be located the same distance behind the mirror as the object is in front of it.

It is important to note that the image produced by a flat mirror is not formed by the convergence or divergence of light rays but by their reflection.

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Which describes the image distance I for the image produced by a flat plane mirror?