A ski jumper starts from rest 45.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 15.0 m above the ground. Neglect air resistance.
(a) What is her speed when she leaves the track?
m/s

(b) What is the maximum altitude she attains after leaving the track?
m

(c) Where does she land relative to the end of the track?
m

Classical mechanics describes the motion of objects on a macroscopic scale, while quantum mechanics deals with the behavior of particles on a microscopic scale. Classical mechanics is deterministic, meaning that it predicts precise outcomes based on initial conditions, while quantum mechanics is probabilistic, providing probabilities of different outcomes. Classical mechanics follows the principle of causality, where every effect has a specific cause, whereas quantum mechanics introduces inherent uncertainty and wave-particle duality. Classical mechanics is well-suited for describing everyday objects, while quantum mechanics is necessary to explain the behavior of particles at the atomic and subatomic levels.

~~~Harsha~~~

Answer:

Explanation:

4 is right

The g on the weight of the two aliens XIGO and LIGO varies as they move from Earth to their planet

To know th nature of the acceleration due to gravity, g, we shall determine the g of the allies in their respective planets. Details below:

First we shall obtain the mass of each alien.

For alien XIGO on earth:

Weight (W) = mass (m) × Acceleration due to gravity (g)

245 = m × 10

Divide both sides by 10

Mass = 250 / 10

Mass of XIGO = 25 Kg

For alien LIGO on earth:

Weight (W) = mass (m) × Acceleration due to gravity (g)

39 = m × 10

Divide both sides by 10

Mass = 39 / 10

Mass of XIGO = 3.9 Kg

Now, we shall determine the g on their planet

For alien XIGO on its planent:

Weight (W) = mass (m) × Acceleration due to gravity (g)

49 = 25 × g

Divide both sides by 25

g = 49 / 25

g = 1.96 m/s²

For alien LIGO on its planent:

Weight (W) = mass (m) × Acceleration due to gravity (g)

196 = 3.9 × g

Divide both sides by 3.9

g = 196 / 3.9

g = 50.25 m/s²

From the above calculation, we can see that the g on the weighs of both aliens varies as they move from Earth to their planet.

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Answer:

6.75 m/s²

Explanation:

The following data were obtained from the question:

Mass (m) of object = 40 Kg

Force applied (Fₐ) = 300 N

Force of friction (Fբ) = 30 N

Acceleration (a) =?

Next, we shall determine the net force acting on the mass. This can be obtained as follow:

Force applied (Fₐ) = 300 N

Force of friction (Fբ) = 30 N

Net force (Fₙ) =?

Fₙ = Fₐ – Fբ

Fₙ = 300 – 30

Fₙ = 270 N

Thus, the net force acting on the mass is 270 N.

Finally, we shall determine acceleration of the mass. This can be obtained as follow:

Mass (m) of object = 40 Kg

Net force (Fₙ) = 270 N

Acceleration (a) =?

Net force = mass × acceleration

Fₙ = m × a

270 = 40 × a

Divide both side by 40

a = 270 / 40

a = 6.75 m/s²

Therefore, the acceleration of the mass is 6.75 m/s²

Answer:

18.89cm

Explanation:

As we know that the person is standing 5m in front of the camera

\(d_0=5m=500cm\)

The focal length of the lens =50cm

f=50 cm

By Lens formula we have:

\(\dfrac{1}{f} = \dfrac{1}{d_i} + \dfrac{1}{d_o}\\\dfrac{1}{50} = \dfrac{1}{d_i} + \dfrac{1}{500}\\\dfrac{1}{d_i} =\dfrac{1}{50}-\dfrac{1}{500}\\\dfrac{1}{d_i}=0.018\\d_i=55.56cm\)

By the formula of magnification

\(\dfrac{h_i}{h_o} = \dfrac{55.56}{500}\\\\h_i = \dfrac{55.56}{500} \times h_o\\\\ h_o=1.70m=170cm\\\\Therefore: h_i=\dfrac{55.56}{500} \times$ 170 cm\\\\h_i =18.89 cm\)

The height of the image formed is 18.89cm.

Steps to formulate a logical, reasonable perspective to any situation are: gather information, identify problem, analyze the situation, consider assumptions, generate solutions, evaluate options, consider your values, make decision and monitor and adjust

Here are the six questions that you can apply to formulating a logical, reasonable perspective to any situation:

What are the issues that should be addressed?

What are the relevant facts and data related to this problem or issue?

What assumptions am I making about the problem or issue?

What are the possible solutions or outcomes, and what are the pros and cons of each?

What are my values and priorities related to this problem or issue?

What additional information do I need to make an informed decision or come to a reasonable conclusion?

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(a) The magnitude of the gravitational force on the rock is 64.68 N and on the pebble is 5.488 x 10⁻³ N.

(b) The acceleration of each object is equal to acceleration due to gravity, = 9.8 m/s².

The gravitational force exerted on each object is calculated by applying Newton's law of universal gravitation as follows;

Fg = Gm₁m₂ / R²

where;

The acceleration of each object will be constant and equal to acceleration due to gravity, the force on each object is calculated by using Newton's second law of motion.

Force on the rock;

F = mg

where;

F = 6.6 kg x 9.8 m/s²

F = 64.68 N

The force on the pebble;

F = mg

F = 5.6 x 10⁻⁴  x 9.8

F = 5.488 x 10⁻³ N

Thus, the acceleration of each object is equal to acceleration due to gravity, = 9.8 m/s².

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Answer:

When you are wet or you are sweating current passes easily.

Explanation:

wetness increases conductivity. therefore 'when it is wet'.

The quantity of heat energy that must be transferred to 2.25 kg of brass to raise its temperature from 20 °C to 240 °C is 195030 J

First, we shall list out the given parameters from the question. This is shown below:

The quantity of heat energy that must be transferred can be obtained as follow:

Q = MCΔT

= 2.25 × 394 × 220

= 195030 J

Thus, we can conclude quantity of heat energy that must be transferred is 195030 J

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Answer:

✔️From Newton's second law of motion we know that

✔️acceleration is inversely proportional to the mass of the body

✔️Here in this question increasing the mass of body will decrease its acceleration.

Explanation:

Hope it will help you :)

The body of a jellyfish can be  excluded due to the absence of fossil records and is denoted as option D.

This is referred to as the remains of plants and animals which have been preserved in the earth crust and it is important as it helps to give more information about life history of different organisms.

Examples of fossils include bones, shells etc as they are the parts of the organism which are preserved and not doesn't decay. The body of a jellyfish will decay and not form a fossilized structure which is therefore the reason why option D was chosen.

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Answer:

372.94 km

d= st

= (64.3 km/h)(5.8h)

=372.94 km

Answer:

Material that allow the electrons to move freely in order to produce a current

Please mark as brainliest if answer is right

Have a great day, be safe and healthy  

Thank u  

XD  

Answer:

Gironde Ecosystem is an important biological and cultural area.

Explanation:

Based on the information provided in the second paragraph of "On a Mountain Trail," the correct option would be "The pack surrounding the sleigh is a very real threat to the two men on the trail." The correct option is C.

In the second paragraph, it is mentioned that the wolves had stopped running and were now "moving at a dogtrot, leisurely and methodically encircling the sleigh." This description implies that the wolves are actively surrounding the sleigh, which suggests a potential threat to the two men on the trail. The word "encircling" indicates a deliberate and coordinated action by the wolves, which implies predatory behavior.

Now let's examine why the other options are not true:

A. The surrounding pack should not be concerning to the two men.

This option is not true because the description in the paragraph clearly implies that the pack of wolves surrounding the sleigh is a cause for concern.

B. The wolves will eventually tire and will return to the safety of the underbrush.

This option is not supported by the information provided in the paragraph. There is no mention of the wolves becoming tired or retreating to the safety of the underbrush. The description implies that the wolves are actively encircling the sleigh, indicating an ongoing threat.

D. Once a sleigh is surrounded by a pack of wolves, there is no chance for human survival.

This option is an extreme statement and goes beyond the information provided in the paragraph. The paragraph does not provide any conclusive information about the chances of human survival in such a situation. It simply describes the current state of the wolves surrounding the sleigh, but it does not make a definitive statement about the outcome for the two men.

Therefore, The correct option is C.

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Answer:

74 m.

Explanation:

From the question given above, the following data were obtained:

Height (h) = 186 m

Initial velocity (u) = 12 m/s

Horizontal distance (d) =?

Next, we shall determine the time taken for the rock to get to the ground. This can be obtained as follow:

Height (h) = 186 m

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

Time (t) =?

H = ½gt²

186 = ½ × 9.8 × t²

186 = 4.9 × t²

Divide both side by 4.9

t² = 186/4.9

Take the square root of both side

t = √(186/4.9)

t = 6.16 s

Thus, the time taken for the rock to get to the ground is 6.16 s

Finally, we shall determine the horizontal distance travelled by the rock as follow:

Initial velocity (u) = 12 m/s

Time (t) = 6.16 s

Horizontal distance (d) =?

Horizontal distance (d) = Initial velocity (u) × Time (t)

d = u × t

d = 12 × 6.16

d = 73.92 ≈ 74 m

Therefore, the horizontal distance travelled by the rock is 74 m

The temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

Using the ideal gas law, we can write: PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature. Since the mass of air is not changing, we can write: PV = constant.

Applying this to the situation where the air mass rises to a level where the pressure is 8.70×10⁴ Pa, we get:

Dividing the second equation by the first and using the fact that γ=Cp/Cv=1.40 for air, we get:

Solving for T2, we get:

Thus, the temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

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Answer:

estrutura cristalina / cloreto de sódio

Explicação:

O cloreto de sódio forma a estrutura cristalina da treliça. Nesta estrutura, um átomo de sódio é cercado por 6 íons de carga oposta. Os íons opostos são negativos porque o sódio perde elétrons, o que o torna ião carregado positivamente chamado cátion, de modo que 6 íons negativos estão presentes ao redor do sódio. A estrutura cristalina também é conhecida como cúbico simples, o que significa que eles são distribuídos em três dimensões com igual distância entre eles e formando um ângulo de 90 graus.

Answer:

The elevation angle is  \(\theta = 3.67^o\)

Explanation:

From the question we are told that

   The velocity is  \(u = 1114\ ft/s\)

    The range of the bullet projection is   \(R = 4950 \ ft\)

     The initial height of bullet is  \(h_1 = 0 \ ft\)

Range of this bullet projection is mathematically represented as

          \(R = \frac{u^2 sin (2 \theta )}{g}\)

=>      \(\theta = \frac{sin ^{-1} [\frac{R * g }{ u^2} ]}{2}\)

Here  \(g = 32 ft/s^2\)

substituting values

         \(\theta = \frac{sin ^{-1} [\frac{4950 * 32 }{ 1114^2} ]}{2}\)

        \(\theta = 3.67^o\)

The required, current 0.018 A circulates counterclockwise through the 5.0-Ω resistor. Option B is correct.

The induced emf causes a current to flow through the loop (the rod and the 5.0-Ω resistor). Since the resistance (R) of the resistor is given as 5.0 Ω, we can find the current (I) through the resistor:
I =E/R

Substitute the value of the induced emf:
I = -[Bwv]/R

Substitute the value in the above equation:
I = -[0.75*4/100*3]/5
I = 0.018 A counterclockwise direction

Thus, the required, current 0.018 A circulates counterclockwise through the 5.0-Ω resistor. Option B is correct.

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Answer:

Curran is testing out a newly waxed hallway floor by sliding in his socks.

He runs from one end of the hallway and starts sliding midway going all

the way to the right. The forces acting on Curran as he is sliding are

represented in the diagram below. Identify the forces and match them

correctly to the n

The force that results in the decrease in speed from the midpoint to the end of the track is friction. The friction force slows down the vehicle because it acts in the opposite direction of the car's motion.

The force that would cause the Hot Wheels car to slow down from the midpoint of the track to the end of the track is friction between the car's wheels and the track.

Friction is a force that opposes motion between two surfaces in contact.

In this case, the wheels of the car and the surface of the track are in contact, and the friction force acts in the opposite direction of the car's motion, which slows it down.

As the Hot Wheels car travels down Track #2 during the Speed Lab activity, its initial velocity decreases due to friction.

Friction is a resistance force that opposes motion.

It is caused by the interaction between the surfaces in contact. In this case, the surface of the track and the wheels of the car are in contact.

When the car is moving, there is friction between the two surfaces.

The direction of the friction force is opposite to the direction of motion of the car.

This means that the friction force slows the car down.

In conclusion, the force that results in the decrease in speed from the midpoint to the end of the track is friction.

The friction force slows down the vehicle because it acts in the opposite direction of the car's motion.

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When materials vibrate, waves are created that travel through the substance, and this energy is what we hear as sound. Earthquakes are earth vibrations that cause the (potential) energy held within rocks to be released (as a result of their pressure-generating relative positions). Seismic waves are produced by earthquakes.

How do sound waves and earthquakes compare?

The waves lose energy as they move through the air with sound or through the ground with shaking during an earthquake. Therefore, a band can be heard louder close to the stage than farther away, and an earthquake can be felt more strongly close to the fault than farther away.

In actuality, sound in the air cannot match how quickly earthquake waves move. In rock, the compressional or "P" wave of an earthquake moves at the In actuality, sound in the air cannot match how quickly earthquake waves move. The speed of a P wave is typically 10,000 mph. The speed of sound through air is roughly 750 mph.

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Answer:

Water molecules move slowest at 0 degrees C, so the answer is A.

Explanation:

The colder the molecules, the less energy they have. Thermal energy is the measurement of how fast the molecules are moving, so the less energy, the less speed. So the answer will be the temperature that is the lowest.

Hope this helps.

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Answer:

Single Displacement Reaction

Explanation:

Here, only one element is getting replaced during the reaction, that is, silver gets replaced by copper, hence, single displacement reaction.

Hope it helps :)

Answer:

The acceleration increases.

Explanation:

From Newton's 2nd Law, we have \(\Sigma F=ma\). We can see that force is directly proportional to mass and acceleration. Therefore, as force increases, either mass or acceleration must increase as well, and vice versa. Since mass is maintained here, if you increase the force applied to the Frisbee, the acceleration will increase as well.

Answer:

357 J

Explanation:

The elastic potential energy of arrow in the stretched bow is 357 J.

The kinetic energy of the arrow after it has been shot is given by half of the product of the arrow's mass and velocity of the arrow.

Here there are no other forms of energy at play here. Only potential and kinetic energy.

As we know that in any system the energy is conserved accordingly the elastic potential energy of the arrow will be equal to the kinetic energy of the bow after it is released i.e., 357 J.