A skier starting from rest accelerates in a straight line down a 43,000 m slope at 1 m/s. How fast were they moving after 5 s?

Answer:

Distance travelled is 7 meters and the displacement is 3 meters

Given the mass and change in velocity of the ball, the impulse force imparted on the ball is 0.5kgm/s.

An impulse is simply a concept that involves the change in the momentum of an object when force is introduced for a period of time.

Using the formula of impulse.

ΔP or Change in Momentum  = Ft  = m( v - u )

Where m is mass, v is final velocity and u is initial velocity

Given that;

ΔP = m( v - u )

ΔP =  0.02kg( 25m/s - 0 )

ΔP =  0.02kg( 25m/s )

ΔP =  0.5kgm/s

Given the mass and change in velocity of the ball, the impulse force imparted on the ball is 0.5kgm/s.

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The correct answer is option c, an alteration of world-wide rainfall. Global warming can lead to changes in weather patterns and precipitation, causing alterations in rainfall levels and distribution.

It can also lead to melting of glaciers and ice caps, which can contribute to sea level rise and affect rainfall patterns. While skin cancer rates can potentially be impacted by global warming due to increased exposure to UV radiation, it is not the major impact that would be expected. Melting of the polar cap is a consequence of global warming.

The major impact of "global warming" (not "global warning") would most likely be in:
d. a melting of the polar ice caps.

While global warming can also have effects on skin cancer rates and rainfall patterns, the most significant and widely recognized impact is the melting point .

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If the moon's orbital plane were exactly the same as the ecliptic plane, the most significant effect would be that solar eclipses would be much more frequent. The correct option is a.

This is because the ecliptic plane is the plane of Earth's orbit around the sun, and most solar eclipses occur when the moon passes between the Earth and the sun, blocking the sun's light from reaching Earth.

Currently, the moon's orbit is tilted at about 5 degrees relative to the ecliptic plane, which means that the moon only passes through the plane of the sun-Earth system (where solar eclipses can occur) twice a year. However, if the moon's orbit were perfectly aligned with the ecliptic plane, solar eclipses would occur much more often, potentially several times a month.

Additionally, if the moon's orbital plane were exactly the same as the ecliptic plane, total solar eclipses would last much longer. This is because the moon's shadow on Earth would be much larger and would move across the surface of the Earth at a slower pace, allowing for a longer period of totality in any given location.

In summary, if the moon's orbital plane were exactly the same as the ecliptic plane, solar eclipses would be much more frequent and total solar eclipses would last much longer. Thus, The correct option is a.

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The third image represents the weak nuclear force in action, therefore the correct answer is option C.

It is a particular kind of power plant where electricity is produced using a nuclear reactor that may use nuclear fusion or nuclear fission.

There are four fundamental forces of nature, gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force.

There are two types of nuclear forces the third image represents the weak nuclear force.

The third image represents the weak nuclear force in action, therefore the correct answer is option C.

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Kepler's Third Law can be expressed mathematically as follows:

\(\[ T^2 = k \cdot d^3 \]\), the constant of proportionality for our planet is approximately \(1.711 \times 10^{-19} \text{ miles}^{-3}\) and the period of Neptune is approximately \(6.252 \times 10^4 \text{ miles}^{4.5}\).

(a) Expressing Kepler's Third Law as an equation:

Kepler's Third Law can be expressed mathematically as follows:

\(\[ T^2 = k \cdot d^3 \]\)

where T is the period of the planet (in units of time), d is the average distance of the planet from the sun (in units of length), and k is the constant of proportionality.

(b) Finding the constant of proportionality:

To find the constant of proportionality, we can use the fact that for our planet (Earth), the period is approximately 365 days and the average distance is about 93 million miles.

Using these values, we can plug them into the equation:

\(\[ (365 \text{ days})^2 = k \cdot (93 \text{ million miles})^3 \]\)

Simplifying the equation, we have:

\(\[ 133,225 = k \cdot (778,500,000,000,000,000,000,000 \text{ miles}^3) \]\)

Dividing both sides of the equation \((778,500,000,000,000,000,000,000 \text{ miles}^3)\), we get:

\(k = 133,225/(778,500,000,000,000,000,000,000 miles^3)\)

Calculating this expression, we find:

\(\[ k \approx 1.711 \times 10^{-19} \text{ miles}^{-3} \]\)

Therefore, the constant of proportionality for our planet is approximately \(1.711 \times 10^{-19} \text{ miles}^{-3}\).

(c) Finding the period of Neptune:

Given that the average distance of Neptune from the sun is about 2.79 × 10^9 miles, we can use Kepler's Third Law to find the period of Neptune.

Using the equation \(\[ T^2 = k \cdot d^3 \]\) and plugging in the values:

\(\[ T^2 = (1.711 \times 10^{-19} \text{ miles}^{-3}) \cdot (2.79 \times 10^9 \text{ miles})^3 \]\)

Simplifying the expression, we have:

\(\[ T^2 = 1.711 \times 10^{-19} \text{ miles}^{-3} \cdot 2.79^3 \times 10^{9 \cdot 3} \text{ miles}^{3 \cdot 3} \]\)

\(\[ T^2 = 1.711 \times 2.79^3 \times 10^{-19 + 27} \text{ miles}^9 \]\)

\(\[ T^2 \approx 1.711 \times 22.796 \times 10^{8} \text{ miles}^9 \]\)

\(\[ T^2 \approx 39.108 \times 10^{8} \text{ miles}^9 \]\)

Taking the square root of both sides to solve for T, we get:

\(\[ T \approx \sqrt{39.108 \times 10^{8}} \text{ miles}^{4.5} \]\)

Calculating the square root, we find:

\(\[ T \approx 6.252 \times 10^4 \text{ miles}^{4.5} \]\)

Therefore, the period of Neptune is approximately \(6.252 \times 10^4 \text{ miles}^{4.5}\)

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Answer:

True

Explanation:

Answer:

V1/T1 = V2/T2 => V2 = V1/T1 * T2 Using the information given, V1 = 1.9 m3 T1 = 32.0 C T2 = 18.0 C we can get: V2 = 1.9/32 * 18 = 1.06875, the volume that would be taken up by the existing ethanol after the temperature change is 1.07. If the capacity is 1.9 m3, then the amount of additional that can be added is 1.90-1.07 which is 0.83 m3.

Explanation:

Answer:

\(0.027m^{3}\)

Explanation:

First, we write down what we know:

\(\Delta{V}_{ethanol} = Change\; in\; volume\; of\; the\; ethanol.\\\beta_{ethanol} = 75\times{10^{-5}}\;{^\circ{C}^{-1}}\\\beta_{steel} = 36\times{10^{-5}}\;{^\circ{C}^{-1}}\\V_{0} = 2.90m^3\\\Delta{T} = T_1-T_0 = 20 - 33 = -13{^\circ{C}}\)

In order to solve this problem, we have to calculate the final volumes of the ethanol and steel respectively and then find their difference, which will give us the volume of ethanol that we can add once the container in cooled.

\(\Delta{V}_{ethanol}= V_{ethanol}-V_0\\Rearrange\; to\; find\; V_{ethanol}\\ V_{ethanol} = \Delta{V}_{ethanol} +V_0\)

\(\Delta{V}_{steel}= V_{steel}-V_0\\Rearrange\; to\; find\; V_{steel}\\ V_{steel} = \Delta{V}_{steel} +V_0\)

Which gives:

\(V_{steel}-V_{ethanol}=volume\;we\;can\;add=V_{free}\\V_{free} = \beta_{steel}V_0\Delta{T}+V_0-(\beta_{ethanol}V_0\Delta{T}+V_0)\\V_{free} = V_0\Delta{T}( \beta_{steel}-\beta_{ethanol})\\V_{free} = (2.9m^3)( -13{^\circ{C}})(36\times{10^{-5}}\;{^\circ{C}^{-1}}-75\times{10^{-5}}\;{^\circ{C}^{-1}})\\V_{free} = 0.027m^3 = 27l\)

Answer:

Truss bridge, bridge with its load-bearing structures composed of a series of wooden or metal triangles, known as trusses. Given that a triangle cannot be distorted by stress, a truss gives a stable form capable of supporting considerable external loads over a large span.

Explanation:

Load-bearing capacity of truss bridges is huge due to the structure of interconnecting triangles. The structure effectively manages both compression and tension by spreading the load from the roadway throughout its intricate structure

Answer:

what table?

Explanation:

Answer:

-5

Explanation:

Answer:

The formula for kinetic energy is,  

where m is mass and v is velocity.  

It's kinetic energy is 64 Joules.

Explanation:

the final velocity of the hot air balloon before touching the ground is  286.16 ft/s.

the final velocity can be calculated as follows:

initial velocity of the sphere, u = 10 ft/s

Acceleration due to gravity, g = 32 ft/s²

Ground clearance, h = 1280 feet

The time it takes for the ball to hit the ground is calculated as:

\(h= ut +\frac{1}{2}gt^2\\ 1280= 10t + (0.5X 32 )t^2\\1280 = 10t +16t^2\\16t^2+ 10t-960 = 0\)

then we can solve the quadratic equation using formula method

\(t=\frac{ -b+/- \sqrt{b^2-4ac} }{2a} \\t = \frac{ -10+/- \sqrt{10^2-4(16X1280)} }{2(16)}\\t= 8.63\)

The final velocity of a hot air balloon is calculated as:

v = u + gt

v = 10 + (8.63 × 32)

v = 286.16 ft/sec

therefore, the final velocity of the hot air balloon before touching the ground is  286.16 ft/s.

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0.25 m is the radius of the coil. when a round flat metal coil has 180 turns and negligible resistance.

the action of defending oneself from an aggressor or refusing to accept something.

We must take the Faraday law into account in order to explain this issue.

When the magnetic field changes due to the induced emf, as indicated by the equation d/dt, the voltage equals I*R=17*6=102 V.

After a coil, the magnetic flux is as follows:

If N is equal to N*A*B, then d is equal to N*A*dB/dt, where A and N are the coil's area and number of turns.

A=*R2, where R is the coil's radius.

Finally, there is;

dФ/dt= N*π*R^2*dB/dt then

R= [dФ/dt/(N*π*dB/dt)]^1/2= [102/(180*π*3)]1/2=245.2*10^-3=≅0.25m

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Answer:

i need help

Explanation:

Answer:

The answer is nodes because nodes stay in a fixed position.

Explanation:

hope it help

srry if wrong

A standing wave has points of constructive interference called antinodes and points of destructive interference called nodes

This position, where the resulting wave is larger than either of the two original, is called constructive interference.

When the first wave is leading, the second wave is down and the addition of the two is zero. This is called destructive interference.

A standing wave occurs when two waves with the same properties moving in the opposite direction, in the same media, interfere with one another.

Nodes are points where the waves interact destructively, causing an appearance of the wave standing still.  The opposite of nodes is antinodes where they are points of maximum displacement due to constructive destruction.

Thus the standing wave has points of constructive interference called antinodes and points of destructive interference called nodes

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The 2 springs should be connected in parallel so that the spring Constant for the combination is 1 Twice that of a single Spring.

How does Hooke's law work?

In accordance with Hooke's law, a principle of elasticity, for relatively minor deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load

A system of two parallel springs connected in accordance with Hooke's Law is equivalent to a single Hookean spring with a spring constant of k. The formula that applies to capacitors linked in parallel in an electrical circuit can be used to determine the value of k.

If spring 1 and 2 have spring constants k1 and k2 respectively,

k is k1+k2

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Based on the provided information, the best approximation for the speed of sound is option C) 340 m/s. In the experiment with resonance tubes, the speed of sound can be determined by measuring the length of the tube that produces a resonant sound.

The length of the tube is related to the wavelength of the sound wave that produces resonance. When the length of the tube is an integer multiple of half the wavelength, resonance occurs. By varying the length of the tube and observing when resonance is achieved, the wavelength can be determined. The speed of sound can then be calculated using the formula: speed of sound = frequency × wavelength.

Option A) 3x\(10^8\) m/s is not a suitable approximation for the speed of sound because it is the speed of light in a vacuum, not the speed of sound in air. Option B) 170 m/s is not a reasonable approximation as it is too low for the speed of sound in air. Option D) 570 m/s is also not a suitable approximation as it is too high for the speed of sound in air. Therefore, option C) 340 m/s is the most appropriate approximation for the speed of sound in this context.

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The demand for an inelastic good does not grow if the price is decreased, hence there is no increase in revenue as a result of the lower price and unchanged demand.

This would suggest that the company shouldn't lower the price of its items because doing so would be advantageous.

Increased total revenue: On the other hand, if the cost of an inelastic good rises as a result of the higher cost and constant level of demand. Prices increases, however, often result in a modest decline in quantity sought. This implies that businesses that offer inelastic products or services can raise prices, selling a little less but generating more income. Therefore, companies that sell items with fixed prices are better positioned to maximise profits and to withstand economic downturns.

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Answer:

C

Explanation:

At the top of a roller coaster there is a cabin whose mass is 100 kg at a height of 40 m and with a speed of 5 m/s, its mechanical energy becomes: 40450 J

Mechanical energy, also known as kinetic energy or potential energy, is the energy that an item possesses when it is in motion or the energy that an object stores due to its location. Renewable energy is also fueled by mechanical energy.

In order to efficiently create electricity or convert energy, many sources of renewable energy depend on mechanical energy.

A compressed spring, for instance, has mechanical energy in the form of potential energy, whereas a moving vehicle has mechanical energy in the form of kinetic energy.

Given that,

mass (m) = 100 kg

speed (v) = 5 m/s

height (h) = 40 m

Total mechanical energy of the roller coaster at point A

= Potential energy at point A + Kinetic energy at point A

= mgh + (1/2)mv²

= (100×9.8×40)+ [0.5×100×(5)²]

= 39200 + 1250

= 40450 J (Answer)

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The linear momentum of an object can be calculated using the formula:

Linear Momentum = Mass × Velocity

In this case, we are given the mass of the object as 2 kg. However, we are not directly given the velocity of the object. Instead, we are given the kinetic energy of the object, which can be related to its velocity.

The formula for kinetic energy is:

Kinetic Energy = 0.5 × Mass × \(Velocity^2\)

Given that the kinetic energy is 10 J and the mass is 2 kg, we can rearrange the formula to solve for the velocity:

10 J = 0.5 × 2 kg × \(Velocity^2\)

Dividing both sides of the equation by 1 kg and multiplying by 2, we get:

20 = \(Velocity^2\)

Taking the square root of both sides, we find:

Velocity ≈ √20 ≈ 4.47 m/s

Now that we know the velocity of the object, we can calculate its linear momentum using the formula:

Linear Momentum = Mass × Velocity

Linear Momentum = 2 kg × 4.47 m/s

Linear Momentum ≈ 8.94 kg·m/s

Therefore, the linear momentum of the 2-kg object is approximately 8.94 kg·m/s.

Linear momentum is a vector quantity and represents the quantity of motion of an object. It depends on the mass of the object and its velocity. In this case, the kinetic energy is used to determine the velocity of the object, which is then used to calculate the linear momentum.

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The coefficient of static friction is usually larger than the coefficient of kinetic friction, meaning it takes more force to get an object moving than to keep it moving.

For most surfaces, the coefficient of static friction is greater than the coefficient of kinetic friction.

The coefficient of static friction is the amount of force required to move an object that is initially at rest relative to a surface. This force is usually greater than the force required to keep the object moving, which is the coefficient of kinetic friction. This is because the static force must overcome the resistance of the surface, while the kinetic force is used to maintain the object's relative motion. This is why it takes more effort to start an object moving than to keep it going.

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Define east as the negative direction and west as the positive direction. The false statement is:

a) If a car is traveling east, its acceleration must be eastward.

Acceleration is a change in speed per unit time. This acceleration is a vector quantity that has both magnitude and direction.

Acceleration is also divided into decelerated acceleration and accelerated acceleration.

Acceleration is decelerated which means that the direction of acceleration is opposite to the direction of velocity.

Meanwhile, the acceleration is accelerated, which means the acceleration is in the same direction as the speed.

Acceleration will be negative if the speed of an object can decrease within a certain time interval.

While the acceleration which is positive will increase over a certain time interval.

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In general, the rows on the periodic table correspond to the energy level of the valence electrons and the columns numbered 1A, 2A, ... 8A correspond to the number of valence electrons.

The periodic table is organized in a way that the elements are arranged in periods (rows) and groups (columns) based on their electronic configurations.

The rows, or periods, on the periodic table represent the energy levels of the electrons in an atom. As you move from top to bottom within a group, each subsequent row corresponds to the next higher energy level of electrons. For example, the first row (period 1) corresponds to the energy level 1, the second row (period 2) corresponds to the energy level 2, and so on.

The columns, or groups, on the periodic table are numbered 1A, 2A, ... 8A (sometimes referred to as 1, 2, ... 18). These groups represent elements with similar properties and configurations of valence electrons. The number of the group indicates the number of valence electrons in the outermost energy level of the atoms within that group. For example, elements in Group 1A (also known as Group 1 or the alkali metals) have one valence electron, elements in Group 2A (Group 2 or alkaline earth metals) have two valence electrons, and so on.

Therefore, the rows on the periodic table correspond to the energy level of the valence electrons, and the columns numbered 1A, 2A, ... 8A correspond to the number of valence electrons.

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The maximum horizontal force that can be applied to the lower block without the upper block slipping is approximately 10.29 N.

To determine the maximum horizontal force that can be applied to the lower block without the upper block slipping, we need to consider the force of static friction between the two blocks.

The maximum force of static friction (F_static_max) can be calculated using the equation:

F_static_max = μ * N

where μ is the coefficient of static friction and N is the normal force between the blocks.

In this case, the normal force (N) is equal to the weight of the upper block, which can be calculated as:

N = m * g

where m is the mass of the upper block and g is the acceleration due to gravity.

Given that the two blocks are identical and each has a mass of 3 kg, the normal force is:

N = (3 kg) * (9.8 m/s^2) = 29.4 N

Now we can calculate the maximum force of static friction:

F_static_max = (0.35) * (29.4 N) ≈ 10.29 N

Therefore, the maximum horizontal force that can be applied to the lower block without the upper block slipping is approximately 10.29 N.

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Answer:

The property of the wave marked X is related to the source of the wave

Explanation:

The source of of origin of waves

Electromagnetic wave are waves that consists of varying electric and magnetic field that vibrate perpendicular to each other and to the direction of propagation of the wave and they are therefore transverse waves and transfer energy

Electromagnetic waves originate from the vibration of charged particles that gives off varying electric and magnetic fields

Mechanical waves are defined as waves that require a material medium such as air, water, metal, plastic, stretched leather, or wood to propagate

Mechanical waves originate from vibration of the particles of a medium

Sound waves which is a form of longitudinal mechanical waves that propagates by the vibration of the particles of a given medium about a point parallel to the direction of propagation of the wave.

Answer:

v₃ = 2 [m/s]

Explanation:

To solve such problems we must use the principle of conservation of momentum. That is, the linear momentum is conserved before and after the collision.

P = m*v

where:

P = linear momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

The momentum is conserved before and after the collision, in this way we can obtain the following equation.

\((m_{1}*v_{1})+(m_{2}*v_{2})=(m_{1}+m_{2})*v_{3}\)

where:

m₁ = mass of the cart moving = 4 [kg]

v₁ =  velocity of the cart moving before the collision = 3 [m/s]

m₂ = mass of the cart initially at rest = 2 [kg]

v₂ = velocity of the cart at rest = 0

v₃ = velocity of the two carts combined (carts stick together) after the collision [m/s]

\((4*3)+(2*0)=(4+2)*v_{3}\\v_{3}=12/6\\v_{3}=2[m/s]\)

Answer:

atomic 11

Explanation:

atomic 11 Na is metal

Answer:

Jo

Explanation:

irradiating food doesn't make it radioactive (that's contamination) and beta particles are stopped by aluminium foil or thin metals, so it may not pass through thick packaging (usually gamma is used to irradiate foods as it can pass through the packaging)