Try to stand up straight from a chair without leaning forward. (Keep your back straight.) Explain what happens.

The sprinter's velocity after the propulsive period is approximately 0.004178 m/s. The velocity of the sprinter can be determined using the impulse-momentum principle, which states that the change in momentum of an object is equal to the impulse applied to it.

In this case, the sprinter applies an impulse of 305 ns (newton-seconds) to the starting blocks. The impulse can be calculated by multiplying the force applied by the time interval over which it is applied. However, the force is not given directly in the question.

To calculate the force, we can use Newton's second law of motion, which states that the force applied to an object is equal to the mass of the object multiplied by its acceleration. In this case, the mass of the sprinter is given as 73 kg.

Since the sprinter starts from a resting position, her initial velocity is 0 m/s. We can assume that the final velocity is v m/s.

Using the impulse-momentum principle, we have:

Impulse = Change in momentum
305 ns = (final momentum - initial momentum)

The momentum of an object can be calculated by multiplying its mass by its velocity. Therefore, the initial momentum of the sprinter is 73 kg * 0 m/s = 0 kg·m/s.

Substituting the values into the equation:

305 ns = (73 kg * v) - 0 kg·m/s

Simplifying the equation:

305 ns = 73 kg * v

Now, we need to convert the time interval from nanoseconds (ns) to seconds (s). To do this, we divide the time interval by 10^9.

305 ns / 10^9 = 73 kg * v

0.305 s = 73 kg * v

Dividing both sides of the equation by 73 kg:

0.305 s / 73 kg = v

Calculating the value:

v ≈ 0.004178 m/s

Therefore, the sprinter's velocity after the propulsive period is approximately 0.004178 m/s.

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Answer:

A proton has a positive charge :)

A neutron has no charge because it is neutral :)

Have a great day!!

Please rate and mark brainliest!!

A proton is positively charged while a neutron has no charge at all.

The total pressure experienced by the diver at the given depth is 201,880 Pa.

The given parameters:

The total pressure experienced by the diver at the given depth is calculated as follows;

\(P = \rho g h\)

where;

ρ is the density of the liquid (kg/m³)

g is acceleration due to gravity

1.03 g/cm³ = 1,030, kg/m³

P = (1030) x (9.8) x (20)

P = 201,880 N/m²

Thus, the total pressure experienced by the diver at the given depth is 201,880 Pa.

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Answer:

The frequency of the sound wave is 800Hz

The speed of sound in a is about 340m/s.

Velocity = frequency x wavelength

making wavelength the subject formula

wavelength = Velocity/frequency.

wavelength = 340/800

wavelength = 0.425m.

Một đại lượng vectơ là một lực. Đại lượng vectơ là đại lượng có cả độ lớn và hướng, như chúng ta đã dạy trong phần trước. Bạn phải xác định cả độ lớn (kích thước hoặc số) và hướng của lực tác dụng lên một vật thể để mô tả hoàn toàn nó.

Given,

Mass of the sample, m=47 g= 0.047 kg

The initial temperature, T₁=80 °F=299.8 K

The final temperature of the sample, T₂=149 °F=338.2 K

Therefore the total raise in the temperature,

The specific heat capacity of the aluminum, c=0.903 J/(g · °C)= 903 J/(kg · K)

The heat required to raise the temperature of a sample by a temperature of ΔT is given by,

On substituting the known values in the above equation,

Therefore the heat required to raise the temperature of the sample from 80 °F to 149 °F is 1629.7 J

As the total resistance increases, the potential difference increases and the total current in the circuit decreases.

If you increase the voltage (or electrical pressure) in a circuit, the current (flow of electrons) will increase in direct proportion. In other words, doubling the voltage doubles the current flow. As the potential difference Δ V \Delta V ΔV increases for a given current I, the resistance R also increases, and vice versa. As the potential difference across an incandescent lamp increases, the current through the lamp also increases due to Ohm's law. As the current flow increases, the lamp also heats up, increasing the resistance of the lamp.

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Answer:

Explanation:

The radial velocity method involves watching the spectral lines of a star as a planet orbits the star. Because of the planets gravitational pull on the star, the star will wobble. This causes Doppler shifts in the spectral lines, allowing astronomers to infer the presence of the planets.

the force of friction between the toolbox and the bed of the truck must also be 0.25 N, which is option (D) in the answer choices.

We can use Newton's second law of motion to solve this problem. The net force acting on the toolbox is the force of friction between the toolbox and the bed of the truck, which acts in the opposite direction to the direction of motion, and the force due to the acceleration of the truck, which acts in the direction of motion. Since the toolbox does not slip from its spot, the force of friction must be equal in magnitude to the force due to the acceleration of the truck. Therefore, we can use the mass of the toolbox and the acceleration of the truck to calculate the force due to the acceleration:

F = ma = (1.00 kg)(0.25 m/s^2) = 0.25 N

Therefore, the force of friction between the toolbox and the bed of the truck must also be 0.25 N, which is option (D) in the answer choices.
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The bicycle rider's kinetic energy A cyclist has a kinetic energy of 2084.44 J.

Up to 90% of a woman's energy or movement can be converted into kinetic energy when riding a bicycle. The bike is then propelled by using this energy. While riding along a path, the bike is kept stable by the rider's momentum and balance.

The relationship between kinetic energy and an object's mass and square of the its velocity is direct: K.E. = ½ m v2. The kinetic energy is measured in kgs divided by the square per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.

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The result is 30 feet after multiplying 1.25 feet by 24 minutes.by the ant.

the length or width between two objects, points, lines, etc. remoteness is the state or fact of something or someone being physically distant from another. a straight line in space It would take too long to walk seven miles in one hour. x feet times 10 feet

8 minutes, 24 minutes

Cross multiplying results in (10 * 24 = 8x), which leads to 240 = 8x.

30 = x, hence the ant will move 30 feet in 24 minutes.

Flow rate:

1-foot Equals 1.25 feet, 8 minutes, and 1 second

The result is 30 feet after multiplying 1.25 feet by 24 minutes.

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Answer:

d I guess not sure

b if down I guess

Explanation:

if worng then plz dont say anything as I am not sure about the ans

Answer:

the answer is B.

Explanation:

The ball that is thrown straight up has more kinetic energy and more speed than the ball that is thrown straight down. Both balls have the same kinetic energy and speed.

The kinetic energy of a body can be determined as the energy of a moving physical system because of its motion. Work has to be done on an object to change its kinetic energy.

The kinetic energy of the moving system can be expressed as K.E. = ½mv²  where ‘m’ is mass while ‘v’ is the velocity of the object.

The potential Energy of the physical system can be described as the energy stored due to its position. The mathematical formula for the calculation of the potential energy can be expressed in the form of P.E = m×g×h where ‘g’ is the gravitational acceleration, ‘m’ is the mass and ‘h’ is the height in meters

When two identical balls are thrown from a cliff, each with the same speed. One ball is thrown straight up, and the other ball is straight down. Both balls will have the same kinetic energy as well as speed.

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The velocity after 2 seconds is 26 m/s. It takes 11.50 seconds to reach a velocity of 40m/s.

Given the equation s(t) = 6t + 5t²

Let's find the velocity after 2 seconds.

(a) Velocity = (ds)/(dt)

Differentiating s(t) with respect to t, we get; ds(t) / dt = 6 + 10t

At t = 2,ds(t) / dt = 6 + 10t = 6 + 10(2) = 26m/s

Therefore, the velocity after 2 seconds is 26 m/s.

(b) We are to find how long it takes for the velocity to reach 40m/s. We know that the initial velocity of the ball, u = 6m/s. Acceleration = gsinθ = 9.81 x sin (angle of inclination) = 9.81 x 0.3 = 2.943 m/s²From the first equation of motion, v = u + at

We know v = 40m/s, u = 6m/s, a = 2.943m/s² and t is what we are to find, hence the equation becomes;40 = 6 + 2.943(t)t = (40 - 6) / 2.943t = 11.50s

Therefore, it takes 11.50 seconds to reach a velocity of 40m/s.

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Answer:

1100 kg

Explanation:

500 lb x 2.20lb (1kg) =1100kg

Answer:

Based on what we have learned so far, in what ways have the experiences of Asian-Canadians stayed the same over time? Why do you think these similarities exist? Please give specific examples to support your ideas.

Explanation:

The value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C is 3.5 x 101 c

The force (F) experienced by a charged particle in an electric field (E) is given by the equation:

F = qE

Where q is the charge of the particle.

In this problem, we are given the force (F) and the electric field (E), and we need to find the value of the charge (q).

Substituting the given values into the equation, we get:

2.4 × 10–3 N = q × 6.8 × 10–5 N/C

Solving for q, we get:

q = (2.4 × 10–3 N) / (6.8 × 10–5 N/C)

q = 3.529 × 10–2 C

Therefore, the value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C is 3.529 × 10–2 C.

The closest answer option is (d) 3.5 x 101 c, which is approximately equal to 3.529 × 10–2 C.

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Manganese dioxide is the substance that results in a brown or black mark on filter paper when an aromatic side chain is oxidized using 2,3, or 4-chlorotoluene, potassium permanganate, and sodium hydroxide in a reflux device (\(MnO_2\)) (See Picture).

Potassium permanganate (\(KMnO_4\)) is reduced to manganese dioxide (\(MnO_2\)) during the oxidation reaction in the presence of sodium hydroxide (\(NaOH\)) and the aromatic side chain. The filter paper may become stained when the combination is filtered because the manganese dioxide is insoluble in water and forms a dark brown or black precipitate.

Typically, the reaction is conducted in a reflux apparatus, where the reaction mixture is heated under reflux conditions until the purple color of the permanganate solution disappears, signifying the reaction's completion. The reaction mixture is then allowed to cool before filtering to extract the precipitate of manganese dioxide from it.

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An EMT asks you how he can decrease the chances of being involved in a collision when driving with lights and sirens in progress. Your advice would be as if the lights of the oncoming car are blinding you, glance to the right side of the road rather than at it.

Drivers up to 3,000 feet away can be rendered blind by headlights approaching from behind. If you feel you won't be able to see after a car passes you, slow down and try not to look directly into its headlights.

If approaching headlights are blinding you while you are driving at night, look to the right side of the road. You'll be able to see other automobiles thanks to your peripheral vision. On your car, apply some reflective tape.

Items are visible at night because of their rich color and striking contrast. Reflective tape is a fantastic option to wear as a result of this especially in dark colours.

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Explanation:

sorry I need some points foe this

Planets detected via the Doppler technique have been mostly gas giants.

What is the Doppler technique?

The Doppler technique, also known as the radial velocity technique, is a technique for detecting exoplanets. It detects planets by measuring the gravitational pull they exert on their star. It works by measuring the star's wobbling motion.

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Electron shielding reduces the effective nuclear charge.

Electron shielding refers to the phenomenon where inner electron shells in an atom partially block the attractive force of the positively charged nucleus on the outer electrons. This shielding effect arises from the repulsion between negatively charged electrons. As a result, the outer electrons experience a reduced effective nuclear charge, which is the positive charge felt by an electron due to the nucleus.

The shielding effect can be explained by considering the electron distribution in an atom. Inner electrons occupy regions closer to the nucleus, creating a barrier that diminishes the electrostatic attraction between the outer electrons and the nucleus. This reduction in the effective nuclear charge affects various atomic properties, such as atomic size and ionization energy.

the concept of electron shielding and its impact on atomic properties, including atomic radius and ionization energy. Understanding electron shielding helps in explaining trends and behaviors observed in the periodic table.

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Answer:

F = 20.61 N

Explanation:

Given that,

Mass of the object, m = 2 kg

It is moving with a speed of 10 m/s

It is acted upon by a 5 N of friction.

The force of gravity acts in downward direction which is given by :

W = mg

W = 2 × 10 = 20 N

5 N of force is acting in horizonal surface.

The net force is given by the resultant of two vectors as follows :

\(F=\sqrt{20^2+5^2} \\\\=20.61\ N\)

So, the net force acting on the object is 20.61 N.

The net force acting on the mass is equal to 13.6 Newton.

Given the following data:

We know that the acceleration due to gravity (g) of an object on planet Earth is equal to 9.8 \(m/s^2\).

To calculate the net force:

First of all, we would determine the normal force acting on the mass.

Mathematically, the normal force is given by the formula:

\(F_N = mg\)

Where:

Substituting the given parameters into the formula, we have;

\(F_N = 2 \times 9.8\)

Normal force = 19.6 Newton

To find net force:

\(Net\;force = 19.6 - 5\)

Net force = 13.6 Newton.

Note: We subtracted because friction opposes the motion of an object and as such acts in opposite direction.

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1 - Incident ray

2 - Refracted ray

3 - Angle of incidence

4 - Angle of refraction

Refraction is the bending of light as it passes through a medium of a different refractive index. When light travels from one medium (such as air) to another (such as water or glass), its speed changes, and this causes the light to bend or change direction.

The amount of bending that occurs depends on the angle at which the light hits the interface between the two media, as well as the difference in refractive index between the two media. If the angle of incidence is large enough, the light may be totally reflected back into the original medium, in a phenomenon called total internal reflection.

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The mass of acetic acid would be 9.435 grams, in 185 mL of vinegar if Vinegar contains 5.00% acetic acid (by mass) and its density is 1.02g / mL

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

Generally, the density of any substance is expressed by the greek symbol ρ. The density is the reciprocal of the specific volume of any substance.

.

By using the above formula for density

ρ = mass / volume

As given in the problem Vinegar contains 5.00% acetic acid (by mass) and its density is 1.02g / mL

The total mass of the vinegar

mass= ρ×volume

       =1.02×185

       =188.7

As given Vinegar contains 5.00% acetic acid (by mass)

the mass of acetic acid = 5×188.7/100

                                       =9.435 gram

Thus, the mass of acetic acid comes out to be 9.435 grams

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Answer:

Following are the responses to the given choices:

Explanation:

The maximum pressure is 10 V from across condenser.

The highest charge mostly on condenser.

\(vc = 10\times 1\ mf\\\\\)

    \(= 10^{-5}\ C\)

The time it takes for the condenser to be 5 V different.

\(time = ln_2 \times 1000 \times 1mf\)

        \(=0 .69 \times 10^{-3}\ sec\)

The speed of the boat is 4 m/s.

The system for pace is speed = distance ÷ time.

To work out what the devices are for pace, you want to understand the gadgets for distance and time. In this case, distance is in meters (m) and time is in seconds (s), so the gadgets could be in meters according to second (m/s).

To resolve for speed or price use the components for pace, s = d/t which means that pace equals distance divided through time.

The pace is a manner of measuring how quickly something is transferring or being performed, or something moving speedily. An example of speed is a vehicle being driven 45 miles in keeping with the hour. An instance of velocity is a person cleaning a room in 10 minutes. An example of velocity is how quickly a jaguar runs.

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Answer: (1a) The magnitude of the centripetal acceleration is 31.4 m/s^2, and the direction is towards the center of the circular motion.

(2a) The astronaut is experiencing 31.4 m/s^2 / 9.8 m/s^2 = 3.22 g's.

(3a) The torque needed to bring the centrifuge to a stop is (5500.0 kg * 31.4 m/s^2 * 20.0 m) = 3,420,000 N * m.

2:

(2a) The period of the pendulum's motion is 0.20 m / 0.10 m/s = 2.0 seconds, and the frequency is 1 / 2.0 s = 0.50 Hz.

(2b) The graphs of velocity and acceleration would be 0.5 seconds out of phase with the displacements shown.

(2c) The acceleration due to gravity on the surface of the planet is 0.10 m/s^2 / 9.8 m/s^2 = 1.02 g's.

Explanation:

When the circuit gets hotter, it can cause the electrical resistance  of current to increase.

The Joule's law of heating says that the heat energy produced in the conductor is directly proportional to the square of electric current, resistance and the time till which the current is supplied.

                                  H=I2RT

This increase in resistance can lead to a decrease in the current flowing through the circuit. In summary, when the circuit gets hotter, the current tends to decrease due to the increase in electrical resistance.

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