At 13:20 on the last Friday in September, 1989 a frantic call was received at the local police station. There had been a serious automobile accident at the intersection of Main Street and State Street with injuries involved. Lt. John Henry arrived at the scene ten minutes after the phone call and found that two cars had collided at the intersection. In one car, the driver was unconscious and in the other car, both the driver and one passenger were injured.
After the emergency vehicles transported the injured to the hospital, Lt. Henry's responsibility is to investigate the accident in order to determine whether one of the drivers (or both) are responsible. With the severity of injury in this accident, the investigation is critical because there may be a fatality involved.

1. What questions does John Henry have to answer in this investigation? What measurements does he need to take? What data should he collect? What other information does he need to record in order to aid the investigation? What physics principles will John Henry need to use in order to help analyze the data and answer his questions?
2. If two cars moving at right angles to each other collide, in what direction do you expect the cars to be moving after the collision?
3. What factors will influence the direction and distance traveled after impact?

The energy of the characteristic x-ray emitted from a tungsten target 1.36*10³ eV.

The energy of a characteristic x-ray emitted from a tungsten target when an electron drops from an M shell (n=3 state) to a vacancy in the K shell (n=1 state) can be estimated using the equation E =hcZ²Δn²/n². Here Z is the atomic number for tungsten (Z=74) and Δn is the difference between n1, the initial orbital, and n2, the final orbital, (n1 - n2). In this case n1= 3 and n2= 1 giving (3-1=2).

Using the equation E =(hc*74²*2²)/1² = (6.63*10-34*.993*17576)/1= 1.36*10³ eV. Therefore, the estimated energy of the characteristic x-ray emitted from the tungsten target when an electron drops from the M shell (n=3) to a vacancy in the K shell (n=1) is approximately 1.36*10³ eV.

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Answer:

coldweld or coldwelding means to join two surfaces (metals) without heat by forcing the both surfaces.

Explanation:

The lens of the eye loses its flexibility with age, which impairs the ability of the eyes to focus. This process is called presbyopia.

Presbyopia happens when the lens of the eye loses its flexibility due to age. The lens of the eye works similar to the lens of a digital camera. The digital camera focuses on objects that are far or near by by adjusting the placement of the lens, by slightly moving it forward or backward, constantly changing its focal length. The human eye does the same, but instead of moving the lens, the lens changes its shape to focus on far or near objects, thereby also changing its focal length. This is also called accommodation.

To focus on far objects, certain muscles around the lens relax, making the lens rounder in shape, while for close objects, the muscles contract, making the lens flatter in shape.

As a person ages, the lens thickens and gradually loses its flexibility, and around the age of 40, the lens is no longer flexible. Therefore, it becomes difficult to focus on close objects. This condition is therefore known as presbyopia.

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Answer:

Ratio of wire 2 to wire 1 is 0.5 : 1

Explanation:

Wire 1:

length = L

radius = r

Wire 2:

length = 2L

radius = 2r

Resistance of a conductor varies directly as the length and inversely as the cross sectional area. Mathematically

\(R = \frac{pl}{a}\)

l = length of conductor

a = cross sectional area of the conductor

p = resistivity of the material with which the conductor is made.

since we are considering the same material, we can ignore the resistivity of the wire.

For wire 1

cross sectional area = \(\pi r^{2}\)

therefore,

resistance R = \(\frac{L}{\pi r^{2} }\)

For the second wire 2

cross sectional area = \(4\pi r^{2}\)

therefore,

resistance R = \(\frac{2L}{4\pi r^{2} }\)

Ratio of wire 2 to wire 1 will be

\(\frac{2L}{4\pi r^{2} }\) ÷ \(\frac{L}{\pi r^{2} }\) = \(\frac{2L}{4\pi r^{2} }\) x \(\frac{\pi r^{2} }{L}\)

Ratio of resistance of wire 2 to wire 1 = 2/4 = 0.5 : 1

Therefore, since energy is lost during the process of a book sliding across a table to a stop, we would say that this process is "irreversible". Which of numerous potential possibilities—B) All scenarios are equally likely—is the one that is most likely to occur. In accordance with the "equipartition of energy" principle, each atom in a gas possesses the same amount of energy at any given time.

Movement across a curved or straight path is known as translation. A motion known as rotation affects the orientation of a body. Motion in physics is the phenomenon of the an object changing it position in relation to time. In mathematics, displacement, distance, velocity, acceleration, and speed are used to explain motion. Motion is the quality in which a body shifts its position with regard to time. The various motions include: 2.1 Straight line motion Particles in linear motion are those that move from one point to another along a straight or curved path.

The pioneering physicist was Isaac Newton. Isaac Newton is renowned for having been inspired to develop the theory of gravity after witnessing an apple fall from a tree. If you've ever struggled with elementary physics, you'll be aware that he created calculus and the three laws of motion that serve as the foundation for all of mechanics.

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Answer:

A (cytosine)

Explanation:

ACGT

Explanation:

Area × thickness = volume

density × volume = mass

mass × gravity = weight

Try to use this and it will work. Don't forget to convert units.

Answer:

20 kg

Explanation:

The following data were obtained from the question:

Force (F) = 100 N

Acceleration (a) = 5 m/s²

Mass (m) =?

Force (F) is simply defined as the product of mass (m) and acceleration (a). Mathematically, the force (F) can be expressed as:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can simply obtain the mass of the object as follow:

Force (F) = 100 N

Acceleration (a) = 5 m/s²

Mass (m) =?

F = ma

100 = m × 5

Divide both side by 5

m = 100 / 5

m = 20 kg

Thus, the mass of the object is 20 kg.

The temperature of the glowing filament is approximately 2045.25 °C.

To determine the temperature of the glowing filament, we can use Wien's displacement law, which states that the peak wavelength of the spectrum of a black body radiator is inversely proportional to its temperature. The formula for Wien's displacement law is:

λmax = b/T

where λmax is the peak wavelength of the spectrum, T is the temperature of the radiator in kelvins, and b is a constant equal to 2.898 × 10^-3 m⋅K.

Converting the peak wavelength of 1250 nm to meters, we get:

λmax = 1250 nm × 10^-9 m/nm = 1.25 × 10^-6 m

Substituting this value into the formula and solving for T, we get:

T = b/λmax = (2.898 × 10^-3 m⋅K)/(1.25 × 10^-6 m) = 2318.4 K

Converting the temperature from kelvins to Celsius, we get:

T = 2318.4 K - 273.15 = 2045.25 °C

Therefore, the temperature of the glowing filament is approximately 2045.25 °C.

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Answer:

Un diafragma es una pieza de silicona o de goma reutilizable que cubre el cuello del útero. El diafragma se coloca dentro de la vagina con espermicida antes de tener relaciones sexuales para prevenir un embarazo. El diafragma es un dispositivo anticonceptivo que impide que los espermatozoides ingresen en el útero.

Answer:

(C)

Explanation:

The discovery that atoms contained smaller parts called electrons.

Answer:

B. a friction force

Explanation:

(i think)

Answer:

C. an electric force

the sweater and Explanation:

Electrons are rubbing against it and are atrractted

Answer: C) Increase the amplitude of the wavelenghth to increase the intensity.

Explanation:

The mass of an atom is less than the sum of the masses of its component protons, neutrons and electrons. The mass defect is 0.0423 amu. The correct option is B.

The mass defect is equal to the mass lost as an equivalent amount of energy during the formation of a given nucleus from the component nucleons.

Δm = M°- M

Δm = Mass defect

M° = Expected total mass

M = Experimentally determined mass

Here 'Li' has 3 protons and 4 neutrons.

The mass of proton = 3 × 1.0073 = 3.0219 amu

The mass of neutron = 4 × 1.0087 = 4.0348 amu

The sum of masses of protons and neutrons = 7.0567

Mass defect = 7.0567 - 7.0144 = 0.0423 amu

Thus the correct option is B.

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The maximum height achieved by the body is 2.645 meters.

The maximum height achieved by the body when thrown upwards with velocity {v} is -

h{max} = v²/2g

Given is to find the maximum height achieved by the body.

The maximum height achieved by the body is -

h{max} = v²/2g

h{max} = (2.3)²/20

h{max} = (2.3)²/20

h{max} = 2.645 meters

Therefore, the maximum height achieved by the body is 2.645 meters.

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{A diver jumps off the 2.8 m springboard with an initial velocity of 3.2 m/s.

to. Determine the maximum height.}

Magnitude of acceleration

Explanation:

We know that acceleration can increase depending in the force applied on an object, any object with a greater mass will apply a greater force. F = M(a).

This Newton's second law establishes a relationship between the summary of the external force and the acceleration of the body,  It is demonstrated with the change in the direction and magnitude of the acceleration in the experiment

Newton's second law establishes a relationship between the net force and the acceleration, according to the expression

          ∑ F = m a

where ∑F is the sum of the external forces, m the mass and the acceleration of the body

In this case we have an initial situation, the block and a baking mass, therefore an acceleration is created towards the hanging mass given by

           W₁ = M₁ g

            F = ma

          M₁ g = m a

          a = \(\frac{M_1}{m} \ g\)

where W₁ and M₁ are the weight and the masses of the mass of the body hanging under the acceleration of gravity.

In the second case, perhaps you have two masses, one on each side,

         ∑ F = W₁ -W₂

          ∑F = (M₁ -M₂) g

let's use Newton's second law

          (M₁ -M₂ ) g = m a

           a = \(\frac{M_1 - M_2}{m} \ g\)

We can see that in the second case the acceleration depends on the difference of the hanging masses. This is a proof of Newton's second law where the effect on acceleration is due to the sum of all external forces and not of each force individually.

In conclusion with the realization of this experiment  demostrate the valid true of Newton's second law

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Answer:

The pressure of the air in the tyre is 20 kPa

Explanation:

The parameters for the bicycle pump and tyre are;

The volume of air contained in the bicycle pump, V₁ = 20 cm³

The pressure of the air contained in the bicycle pump, P₁ = 100 kPa

The volume (available) of the tyre, where the air is pumped, V₂ = 100 cm³

Let P₂ represent the pressure in the tyre after the air is pumped

By Boyle's law, we have that at constant temperature, the volume of a given mass of gas is inversely proportional to its pressure;

Mathematically, Boyle's law gives the following equation;

P₁ × V₁ = P₂ × V₂

∴ P₂ = (P₁ × V₁)/V₂

Substituting the known values gives;

P₂ = (100 kPa × 20 cm³)/(100 cm³)

∴ P₂ = 100 kPa × 1/5 = 20 kPa

P₂ = 20 kPa

The pressure of the air in the tyre = P₂ = 20 kPa.

As per the given conditions of the problem, A child sprays her sister with water from a garden hose.

The water is supplied to the hose at a rate of 0.117 L/s, and the diameter of the nozzle is 5.95 mm.

We need to determine the speed at which the water exits the nozzle.

To determine the speed v at which the water exits the nozzle, we need to apply Bernoulli's principle.

According to Bernoulli's principle, the pressure of a fluid decreases as its velocity increases, keeping the total energy constant.

The Bernoulli equation is written as:

P₁ + ρgh₁ + 1/2ρv₁² = P₂ + ρgh₂ + 1/2ρv₂²

where:

P₁ = Pressure at Point 1v₁ = Velocity at Point 1h₁ = Height at Point 1ρ = Density

g = Acceleration due to gravity

P₂ = Pressure at Point 2v₂ = Velocity at Point 2h₂ = Height at Point 2

Assuming that the hose is horizontal, the height at both points 1 and 2 are equal, so the terms ρgh₁ and ρgh₂ can be ignored.

Also, assuming that the fluid is incompressible, the term P₁ can be considered negligible in comparison to P₂.

Hence the Bernoulli equation can be written as:

1/2ρv₁² = 1/2ρv₂²

The mass flow rate is given by:

ṁ = ρAvwhere,

ṁ = mass flow rate

ρ = density of the fluid

A = cross-sectional area of the nozzle

v = velocity of the fluid

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Answer:

I believe it is false I took the test

Answer:

false

Explanation:

Answer:

If the wind speed increased, the plane's ground speed would be affected.

Explanation:

The ground speed of a plane is the speed at which it is traveling relative to the ground. Wind speed affects the plane's airspeed, which is the speed at which it is traveling relative to the air. If the wind speed increases, it can either help or hinder the plane's ground speed, depending on whether the wind is a headwind or a tailwind. A headwind can slow down the plane's ground speed, while a tailwind can increase it.

Answer:

Od- Wooden

Explanation:

It would not make sense if it was non-wood because that make it no a wood base product, OC is not right because its not a a plant that produces wood as its structural tissue and thus has a hard stem.   An OA justT o take or get a supply of wood. so its Od

The statement "They have a positive charge and are present in the nucleus of an atom along with the neutrons" correctly describes protons.

Protons are small particles that make up the nucleus of an atom. They carry a positive charge and have a mass of approximately 1 atomic mass unit. The number of protons within an atom's nucleus defines its atomic number and thus its identity as an element.

For instance, carbon atoms have 6 protons, and oxygen atoms have 8 protons. Protons are vital building blocks of all atoms and play a significant role in the chemical behavior and reactions of elements.

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Answer:

225

Explanation:

Answer:

I am doing the test now let me make sure then I tell you ok, just a second..

225 is correct

Explanation:

Answer:

thermal energy

Explanation:

Answer:

Physics Net Force

Explanation:

Physics Net Force

The net force is the combined force of all individual forces acting on an object. Newton's First Law can be seen to be the special case in the Second Law when F, the net force, is zero. When that happens, the acceleration a must also be zero.

Hope this helped you!!

Rocket B's speed in relation to rocket A is 0.4c

If the two frames of reference's directions are at odds with one another, the two frames of reference would see the relative speed as the total of their individual speeds. Furthermore, if the motion of the two frames is parallel, relative speed would be seen as the difference between the individual speeds.

The Earth's frame of reference is at rest, but the two rockets passing by are traveling relativistically with respect to Earth.

Since both rockets are moving in the same general direction, rocket B's relative speed to rocket A is equal to the difference between the two rockets' individual speeds.

Speed of rocket A is v = 0.70c

speed of the rocket B is u =0.86c

let,

speed of the rocket B with respect to rocket A is u₁

Now,

u₁ = (u - v) / [(1 - u) * (v / c²)]

u₁ = (0.86 - 0.70) / (1 - 0.86 * 0.70 / c²)

u₁ = 0.16 / (1 - 0.6) = 0.16 / 0.4

∴ u₁ = 0.4c

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Answer:

I can help with the last question.

Explanation:

The force from the ball on the left ball will hit the ball next to it, bringing the force all the way to the right ball, and vice versa. Have a great day!

Answer:

gravity is pulls objects to the center of the earth.

friction is slows or stops motion when objects rub together.

magnetism is pushes or pulls objects containing iron or other metals.