What is Newton’s Second Law

Answer:

sorry dude.use a computer program.

The positions to be considered are the position of the acorn and the earth.

The potential energy is the energy that is possessed by a body by virtue of its position. Hence, the potential energy of a body changes as its position changes.

Hence, to determine how the potential energy of the acorn changes in relation to the earth, the positions to be considered are the position of the acorn and the earth.

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The diagram that represents the directions of the velocity, v, and acceleration, a, of a toy car as it moves in a clockwise, horizontal, circular path at a constant speed is Diagram B.

In a circular motion, the velocity is always tangential to the circular path, while the acceleration is always directed towards the center of the circle. This means that the velocity and acceleration are always perpendicular to each other.

In Diagram B, the velocity is shown as a vector pointing in the tangential direction to the circular path, while the acceleration is shown as a vector pointing towards the center of the circle. This is the correct representation of the directions of the velocity and acceleration of a toy car moving in a clockwise, horizontal, circular path at a constant speed.

Therefore, the correct answer is Diagram B

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Answer:

the fusion of hydrogen nuclei or in other words "nuclear fusion"

Explanation:

The type of lens known as telephoto has a variable focal length is a false statement.

The focal length of telephoto lenses is frequently fixed or continuous. To produce a narrow field of vision and magnify distant things, telephoto lenses are intended to have a greater focal length than the actual length of the lens. Comparing this design to a conventional long-focus lens with the same focal length, the result is a lens that is smaller and lighter.

In photography, telephoto lenses are frequently employed to capture far-off subjects like wildlife, sporting events, or celestial objects. They enable photographers to focus closer and separate the subject from the backdrop, resulting in compressed perspectives. It's crucial to remember, though, that some zoom lenses have a telephoto focal length as part of their zoom.

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Answer:

1333.34 kg

Explanation:

Given that,

The mass of the gun, m = 8 kg

Speed of the bullet, V = 50 m/s

The recoil speed of the gun, v = -0.3 m/s

We need to find the mass of the bullet. Using the conservation of momentum to find it. Let M is the mass of the bullet.

\(mv=MV\\\\M=\dfrac{mv}{V}\\\\=\dfrac{50\times 8}{0.3}\\\\=1333.34\ kg\)

So, the mass of the bullet is 1333.34 kg.

Yes, the object is able to have zero velocity and non-zero acceleration at the same time.

From acceleration theory, we know that acceleration is the change of speed in a moment. We can determine as

a = dv / dt

It means that the velocity can be zero in the final condition or the initial condition. For example, the car is traveling to a mountain and falls down in that time the car got a minus acceleration until having zero velocity and then the velocity goes to a minus value and the car falls down.

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Answer: Diagrams 3 and 4.

Explanation:

The force that one charge q1 experiences when is at a distance R of another charge q2 is:

F = k*(q1*q2)/R^2

Where k is a constant.

If this force is positive, the chares move away from each other, so if both charges are positives or both charges are negatives, then the charges move away from each other, meaning that the force is repulsive.

If the force is negative, the force is towards the other particle, then the force is attractive. This happens when one charge is positive and the other is negative.

Then the correct options are 3 and 4.

Answer:

550 m/s

Explanation:

Speed of wave = wl * f      wl = 1,25 m    f = 440 Hz  (given)

                          1.25 m * 440 = 550 m/s

The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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Answer:

On molecules of PH3, there has to be 3 atoms.

Explanation:

The Element Hydrogen (H) has 3 attoms.

The Element Phosphorus (P) has 1 atom.

These two created into the molecule PH3, would have to have only 3 attoms because they are asking how many hydrogens atoms are in the molecule PH3.    

Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

According to the uncertainty principle, the more precisely we measure the position of a subatomic particle, the less precisely we can know its momentum. The uncertainty in position and momentum is related by the inequality Δx * Δp ≥ h/4π, where Δx represents the uncertainty in position, Δp represents the uncertainty in momentum, and h is Planck's constant.

The principle applies to other pairs of conjugate variables, such as energy and time or angular position and angular momentum. By measuring one variable with high precision, the other variable becomes highly uncertain. The statement correctly mentions that the spin of a subatomic particle would also be subject to uncertainty when its position is measured precisely. Spin is an intrinsic property of particles, and its measurement is subject to the same principles of the uncertainty principle as position and momentum. The statement is true. Precise measurement of a subatomic particle's position results in a highly uncertain momentum and spin, thus violating the Heisenberg uncertainty principle.

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Guion Bluford was the first African American to travel to space. Bluford made his initial journey into space on August 30, 1983.

Guion Bluford, a United States Air Force officer and former NASA astronaut, was the first African American to travel to space. Bluford made his initial journey into space on August 30, 1983, aboard the space shuttle Challenger, which was the shuttle's third flight, making him the first African American astronaut to journey into space. Bluford was a member of the United States Air Force before joining NASA in 1979. He served as a fighter pilot in the Vietnam War and was stationed in many nations during his Air Force career. He was among the chosen group of space shuttle astronauts in NASA's first class of minority astronauts in 1978. Bluford's second mission, also on board Challenger, occurred in 1985. His third trip into orbit, as a payload specialist, aboard the Discovery in 1991. Bluford logged over 688 hours in space on these three spaceflights. He resigned from NASA in 1993 to work in the private industry.

Guion Bluford, a United States Air Force officer and former NASA astronaut, was the first African American to travel to space. Bluford made his initial journey into space on August 30, 1983, aboard the space shuttle Challenger, which was the shuttle's third flight, making him the first African American astronaut to journey into space.

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Answer:

According to Newton's first law:  An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

There is a force that moves the skater and his skate forward, after the hit, his speed is reduced, but this force is not completely counteracted, and that's why he continues moving forward.

Answer:

Explanation:

As an example, ice on steel has a low coefficient of friction – the two materials slide past each other easily – while rubber on pavement has a high coefficient of friction – the materials do not slide past each other easily. The coefficients of friction ranges from near 0 to greater than 1.

Answer:4 and 5

Explanation:it you add 1+3 and 2+3 it is 4 and 5

Answer:

The Doppler Effect is given by the following relation;

\(f' = \left (\dfrac{v + v_0}{v - v_s} \right) \times f\)

Where;

f' = The frequency the observer hears

f = Actual frequency of the wave

v = The velocity of the sound wave

\(v_o\) = The velocity of the observer

\(v_s\) = The velocity of the source

Where the observer is stationary, we have;

(i) When the source is moving in the direction of the observer

\(f' = \left (\dfrac{v }{v - v_s} \right) \times f\)

(ii) When the source is receding from the observer, we have;

\(f' = \left (\dfrac{v }{v + v_s} \right) \times f\)

Therefore;

(a) A person left behind on the platform

For a person left behind on the platform, we have that the radio source is receding, therefore, we have;

\(f' = \left (\dfrac{v }{v + v_s} \right) \times f\)

(1) Given that (v + \(v_s\)) > v, therefore, v < (v + \(v_s\)), f' < f, the frequency heard by the person left on the platform, f', is smaller (lower) than the frequency produced by the radio

(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity

(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively smaller

(b) A person down below floating on a rubber raft

For the the person down below on the rubber raft, the radio source is advancing

Therefore, the radio source is moving towards the person at rest down on the rubber raft, therefore, we have;

\(f' = \left (\dfrac{v }{v - v_s} \right) \times f\)

(1) Given that (v - \(v_s\)) < v, therefore, f' > f, the frequency heard by the person down below floating on the rubber raft, f', is greater (higher) than the frequency produced by the radio

(2) The frequency is not constant as the speed of the source is increasing while it under the acceleration due to gravity

(3) During the fall, the speed of the source continuously increases under the effect of gravitational attraction and therefore the frequency heard by the person on the platform becomes progressively greater (higher)

Explanation:

Answer:

15.49 m/s

Explanation:

We know that the stopping distance is ,

=> s = u²/2(-a)

So that ,

=> 20m = u² / 2* 6m/s²

=> u² = 240m²/s²

=> u = √240 m²/s²

=> u = 15.49 m/s

**Edits are welcomed**

Answer:

A healthy diet, low in sugar, caffeine, and alcohol, can promote health and reduce stress.

Explanation:

A healthy diet, low in sugar, caffeine, and alcohol, can promote health and reduce stress. Get adequate sleep: A good night's sleep makes you able to tackle the day's stress more easily. When you are tired, you are less patient and more easily agitated, which can increase stress.

The given statement " in a core-collapse supernova, outer part of the core rebounds from the inner, high-density core, destroying the entire outer part of  star. " is True. Because, In a core-collapse supernova, the outer part of star's core rebounds after it collapses inward due to the force of gravity.

This rebound creates a powerful shock wave that travels outward and collides with the outer layers of star, causing them to explode outward in a catastrophic event. The energy released in this explosion can be as much as ten times mass-energy of the Sun, making core-collapse supernovae one of the most energetic events in the universe. The high density and temperature of the inner core are not affected by the explosion .

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67 kelvin is -206.15 celcius

Answer: the stopping distance for an initial speed of 15 m/s with a constant deceleration of 3.9 m/s² is approximately 57.7 meters.

Explanation:

To calculate the stopping distance, we need to use the following equation of motion:

v² = u² + 2as

where:

v is the final velocity (in this case, it is 0 because the car stops)

u is the initial velocity (15 m/s)

a is the deceleration (-3.9 m/s²)

s is the stopping distance (what we want to find)

Substituting the given values in the equation, we get:

0² = 15² + 2(-3.9)s

Simplifying and solving for s, we get:

s = (15²) / (2 × 3.9) ≈ 57.7 meters

Answer:

Explanation:

Greetings!!!

Mass(m)= 1900kg

Acceleration (a)= 6.0m/s²

Force (F)= ?

Firstly, recall Newton's second law.

Substitute known variables into the equation

Solve for Force

If you have any questions tag me on comments

Hope it helps!!!

1: Average tangential acceleration = (12 m/s - 0 m/s) / 3.3 s ≈ 3.64 m/s²

2: radius = 3.64 m/s² / 11 rad/s² ≈ 0.331 m

3: θ = 0.5 * 11 rad/s² * (3.3 s)² ≈ 59.67 radians

4: The ant has traveled approximately 19.78 meters along the arc of the tire during the given time interval.

1: The average tangential acceleration of the tire can be determined using the formula:

Average tangential acceleration = (final tangential velocity - initial tangential velocity) / time

Given that the ant's speed increases from zero to 12 m/s in 3.3 seconds, the initial tangential velocity is 0 m/s and the final tangential velocity is 12 m/s. Plugging these values into the formula, we get:

Average tangential acceleration = (12 m/s - 0 m/s) / 3.3 s ≈ 3.64 m/s²

2: The radius of the tire can be determined using the formula:

Average tangential acceleration = rotational acceleration * radius

Given that the rotational acceleration of the wheel is 11 rad/s² and the average tangential acceleration is 3.64 m/s², we can rearrange the formula to solve for the radius:

radius = average tangential acceleration / rotational acceleration

Plugging in the values, we get:

radius = 3.64 m/s² / 11 rad/s² ≈ 0.331 m

3: The angle the ant has turned during this time interval can be calculated using the formula:

θ = 0.5 * rotational acceleration * (time)²

Plugging in the given values, we get:

θ = 0.5 * 11 rad/s² * (3.3 s)² ≈ 59.67 radians

4: The distance the ant has traveled along the arc during this time interval can be calculated using the formula:

Distance = radius * θ

Plugging in the values, we get:

Distance = 0.331 m * 59.67 radians ≈ 19.78 meters

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By analyzing the velocity-time graph, we can determine the maximum speed at the end of the constant speed phase and the disability during the deceleration phase.

To sketch the velocity-time graph and determine the maximum speed and disability, let's break down the motion into three phases:

Phase 1: Acceleration

The object starts from rest and undergoes acceleration for 40 seconds at a constant speed. During this phase, the velocity increases linearly with time. The slope of the velocity-time graph will be a straight line with a positive gradient.

Phase 2: Constant Speed

After 40 seconds, the object continues to move at a constant speed for the next 100 seconds. During this phase, the velocity remains constant, resulting in a horizontal line on the velocity-time graph.

Phase 3: disability

After 140 seconds, the object is brought to rest with uniform disability over a duration of 20 seconds. The velocity decreases linearly with time during this phase. The slope of the velocity-time graph will be a straight line with a negative gradient.

To determine the maximum speed, we need to find the highest point on the velocity-time graph. In this case, it occurs at the end of phase 2 when the object is moving at a constant speed. The maximum speed is reached at this point.

To determine the disability, we need to find the slope of the line during phase 3. The negative gradient of the velocity-time graph during the deceleration phase represents the magnitude of the uniform disability.

Therefore, by analyzing the velocity-time graph, we can determine the maximum speed at the end of phase 2 and the disability during phase 3.

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The better predictor of increase in force of contraction, change in semg amplitude of spikes.

A force in physics is an effect that has the power to alter an object's motion. 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.

Given that in the question the  better predictor of increase in force of contraction, change in semg amplitude of spikes or change in semg frequency of spikes.

The better predictor of increase in force of contraction, change in semg amplitude of spikes.

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Trusses are structures made up of interconnected triangles that are used to support loads. The members of the truss can either be in tension or compression, depending on the orientation of the load.

To determine the force in each member of the truss, you first need to analyze the forces acting on the entire structure. This involves drawing a free body diagram of the truss and applying the principles of statics to calculate the forces acting on each member.

Once you have determined the external forces acting on the truss, you can use the method of joints or the method of sections to analyze the internal forces in each member. In summary, determining the force in each member of a truss is a complex process that involves analyzing the external forces acting on the structure, using the method of joints or the method of sections to analyze the internal forces in each member, and determining whether the members are in tension or compression.

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