Much like scientists study cause and effect, firefighters and fire investigators observe the effects of a fire and try to find out its cause. Read the following example:
An office building caught fire early one morning, just as people were coming to work. Something caused the fire, and fire investigators need to collect data to
determine what did it. Place a checkmark next to the data that could be related to the fire in this office building and could help them determine its cause:
- A light switch with worn electrical wiring was found on the third
floor.
- Gasoline was stored in the basement of the building.
- The building is in the downtown area of a big city.
- It took firefighters 45 minutes to put out the fire.
- The fire started on the third floor of the building.
- People coming to work turned on the lights in the building.
- People smoking in bed can start fires.
- Oily rags were kept in an open container on the first floor.

Answer:

down below

Explanation:

I assume you're asking about it's orbit around the sun. I believe the Earth's orbit around the sun would be shorter. If the Earth sped up, one can assume that means the days are shorter and the rate at which the Earth orbits the sun would also speed up.

This sounds like an open ended question, so I don't think there can be a wrong answer.

Hope this helps! :)

Option B: The pressure in the neck is equal to the pressure in the knee because of the equal dynamic pressure according to the continuity equation is the answer.

Assuming that the human circulatory system obeys Bernoulli's principle of hydrodynamics, the most accurate comparison of blood pressure in capillaries in the neck and those of equal cross-sectional area in the right knee yields: The neck pressure equals the knee pressure with the same dynamic pressure according to the continuity equation. The Bernoulli equation describes the flow of an incompressible fluid in a pipe and how that flow is affected by changes in pressure. 

In this case, it can be applied to the flow of blood through capillaries in the neck and right knee. The continuity equation, which states that the volume flow rate of fluid through a tube must remain constant, regardless of changes in the tube's cross-sectional area or shape, can also be applied in this case. Because the two capillaries have the same cross-sectional area, the dynamic pressure in both capillaries must be the same because of the continuity equation. This indicates that the pressure in the neck is equal to the pressure in the knee.

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Explanation:

it requires energy

hope it helps

Answer:

(i) Si device are coated with B or Li for neutron detection

(ii) Fast neutrons are normally first slowed down  to thermal energies before measurement

(iii) The strip detectors consists of p⁺ and n implants in the region of a very thin (300 to 400 μm) depletion zone  though which the neutrons traverse producing a readout based on the generated charges being directed to the cathode, p⁺, material  which then transmits the charge to the device electronics

Explanation:

(i) Detection of neurons with only an Si device in not possible due to the large neutrons path in Si such that the silicon needs to be coated with B or Li which readily interact with neutrons. The neutron interaction with the reactive coating produces an alpha particle which can be detected by the semi conductor and a nucleus

(ii) Neutrons having a kinetic energy that is more than 1 MeV which as such has a velocity of more than 15,000 km/s is known as fast neutrons or fission neutrons. The fast neutrons are slowed in a nuclear reactor by neutron moderation to thermal energies

Due their high speed, fast neutrons are normally slowed down which however results in the loss of some vector properties of the neutron

Techniques for fast neutron detection includes,

1) Recoil detectors which are capable of fast neutron detection without moderation

2) Bonner spheres detector first converts the fast moving electron to slow down before detection

3) Scintillation counter are widely used but require the conversion of the neutron to a charged particles before detection

(iii) Strip detectors provide high precision measurement of a particle's crossing point which can be further improved by use of low noise electronics

Applications of silicon strip detectors include

1) Particle tracking in research in particle physics

2) Particle tracking in researches in x-spectroscopy nuclear research

3) Imaging in x-talography

4) Medical research imaging

5) Particle tracking and imaging in astrophysics.

A ball is attached to a string that is whirled around in a horizontal circle having the radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is one-half the original speed.

The formula for the centripetal force is

                 F = mv² / r

where F is the centripetal force

          m is the mass of the ball

          v is the velocity of the ball

          r is the radius of the circular movement

Let us rearrange the equation,

               \(\displaystyle v = \sqrt{\frac{Fr}{m}\)

If the radius of the circular movement is reduced as r/4, then the velocity becomes,

               \(\displaystyle v = \sqrt{\frac{Fr}{4m}\)

              \(\displaystyle v = \frac{1}{2} \sqrt{\frac{Fr}{m}\)

which means that if the radius is reduced by one of forth the original, then the velocity will be reduced by twice the original.

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The complete question is

A ball attached to a string is whirled around in a horizontal circle having a radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is which of the following?

 (A) One-quarter the original speed

 (B) One-half the original speed  

(C) The same as the original speed

(D) Twice the original speed

(E) Four times the original speed

Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

Answer:

39°F

Explanation:

At 39°F  water is the most dense. This is because the molecules are closest together at this temperature

Also: Liquid water can be hotter than 100 °C (212 °F) and colder than 0 °C (32 °F). Heating water above its boiling point without boiling is called superheating. If water is superheated, it can exceed its boiling point without boiling

Hope this helps ❤️

Answer:

increasing the speed o

Explanation:

direction change

The graph which shows the position of the object at a particular time is called a position-time graph. The position of the object is increasing with time.

The graph which shows the position of the object at a particular time is called a position time graph.

In the given graph, The position of the object in the 1st minute was 50 m, and the position of the object in the 3rd minute was between 50 to 100. The position of the object at the 5th minute was in the range of 100 to 150 m.

The position-time graph shows the velocity of the object. The slope of the object gives the location of the object.

There are two types of graphs such as straight line graphs and curve graphs. If the graph is curved it is showing the slope of the object keeps on changing.

Therefore, The graph which shows the position of the object at a particular time is called the position-time graph. The position of the object is increasing with time.

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Answer:

solid

Explanation:

it's not liquid, nor gas, so solid.

After pushing off, the lighter skater remains at rest and does not have any velocity.

We can apply the principle of conservation of momentum. According to this principle, the total momentum before the push should be equal to the total momentum after the push.

Initial velocity of both skaters (before the push) = 0 m/s

Final velocity of the heavier skater (after the push) = 1.50 m/s to the right

Mass of the heavier skater = M (unknown)

Mass of the lighter skater = m (unknown)

Final velocity of the lighter skater (after the push) = v (unknown)

Since the ice is frictionless, the total momentum before the push is zero. After the push, the total momentum should still be zero, as no external forces act on the system.

Total momentum before the push = Total momentum after the push

0 = (M * 0) + (m * v)

Simplifying the equation:

0 = 0 + mv

Since the mass of the lighter skater is m, the equation can be further simplified:

0 = mv

From this equation, we can conclude that the final velocity of the lighter skater (v) is also 0 m/s.

Therefore, after pushing off, the lighter skater remains at rest.

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Alternating current

Alternating Current (AC) is a type of electric current where the direction of the flow of electric charge periodically reverses. It is called "alternating" because the current alternates its direction in a regular pattern. In an AC system, the flow of electric charge continuously changes its polarity, moving back and forth.

AC is widely used for transmitting electricity over long distances and for powering most of our everyday electrical devices. There are several reasons why AC is the preferred choice for electricity transmission:

1. Efficiency: AC can be easily transformed to higher or lower voltages using transformers, allowing for efficient transmission over long distances. Higher voltages reduce the amount of current required, resulting in lower energy losses during transmission.

2. Safety: AC voltage can be easily controlled and manipulated, making it safer for use in homes and workplaces. AC systems use a standard frequency (e.g., 50 or 60 Hz), which is less likely to cause harm to humans compared to higher frequencies.

3. Compatibility: AC is compatible with a wide range of electrical devices and appliances. It can power everything from small electronics to large industrial machinery without the need for additional conversion or adaptation.

4. Generation: AC can be generated using various sources such as power plants, generators, and renewable energy systems. Generating AC is relatively straightforward and can be done using different types of generators, including rotating machines and solar inverters.

While AC is the most common type of electric current for transmitting electricity, there are situations where Direct Current (DC) is preferred. DC is used in certain applications such as batteries, electronic circuits, and some specialized industries. However, for large-scale power distribution and everyday use, AC is the primary choice due to its efficiency, safety, and compatibility.

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Answer:

just add co-ratios and then find the average.

Explanation:

Explanation:

AVERAGE speed is   (144 - 0 ) /2 = 72 km/hr = 20 m/s

then in 20 swconds    20 m/s * 20 s = 400 meters

Answer: 40 miles

Explanation:

Y component of momentum before collision  = -0.271 Kg m/s.

Y component of momentum before collision  = - mv

Using Energy Conservation -

mgh = 0.5m\(v^{2}\)

v= \(\sqrt{2gh}\)

v = \(\sqrt{2*9.8*1.5}\)

v = - 5.42 m/s

Y component of momentum before collision  = - 50×\(10^{-3}\) ×5.42 Kgm/s

Y component of momentum before collision  = -0.271 Kg m/s

Momentum is made of the mass of a particle and its speed. Momentum is a vector amount; i.e., it has both value and path. Isaac Newton's second regulation of motion states that the time charge of the exchange of momentum is the same as the pressure acting on the particle. See Newton's laws of motion.

In Newtonian mechanics, momentum (greater in particular linear momentum or translational momentum) is made from the mass and speed of an object. it is a standard mechanical amount. it's far a vector amount, possessing importance and direction. Momentum is a vector quantity: it has both significance and direction. because momentum has a path, it can be used to are expecting the resulting direction and speed of movement of objects when they collide. below, the basic residences of momentum are described in a single measurement.

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Answer:

please find attached file

Explanation:

Answer:

1800 seconds

Explanation:

Given,

Distance ( d ) = 18 km

Velocity ( v ) = 10 m/s

To find : Time ( t ) = ?

Distance in km need to be converted to m.

1 km = 1000 m

18 km

= 18 x 1000

= 18000 m

So,

d = 18000 m

Formula : -

v = d / t

t = d / v

= 18000 / 10

t = 1800 seconds.

Therefore,

1800 seconds long, it will take to cover a distance of 18 km.

Your answer would 1800 seconds.

You're welcome ;)

Answer:

The principal hair fiber used to produce textile fabrics is sheep's wool. In wild sheep, the wool is a short, soft underlayer protected by longer, coarser hair. ... Fur fibers from animals such as mink and beavers are sometimes blended with other hairs to spin luxury yarns but are most often found as fur pelts.

Explanation:

divide the distance by the time it takes to travel that same distance, then add your direction to it.

Or change in displacement divided by change in time.

Answer:

True

Explanation:

I took the test

the work done by the crane to lift the steel girder is 19,200 J.

The crane lifts an 8-m long steel girder weighing 1600 N up 12 m off the ground, and it did 12,800 J of work.

This is because the work done by the crane is given by:

Work = Force x Distance x cos(theta)

where,

Force = 1600 N

Distance = 12 m

theta = 0 degrees (since the force is applied vertically upward)

cos(0) = 1

Therefore,

Work = 1600 N x 12 m x 1Work = 19,200 J

So, the work done by the crane to lift the steel girder is 19,200 J.

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Answer:

\(\Huge \boxed{\mathrm{13.5 \ Joules}}\)

Explanation:

\(\sf Kinetic \ energy \ (J)=\frac{1}{2} \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2\)

\(\mathrm{KE=\frac{1}{2} mv^2}\)

The mass of the ball is 3 kg.

The velocity of the ball rolling is 3 m/s.

\(\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 3^2}\)

Evaluating and solving for kinetic energy.

\(\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 9}\)

\(\mathrm{KE=\frac{1}{2} \cdot 27}\)

\(\mathrm{KE} =13.5\)

The kinetic energy of the ball is 13.5 Joules.

Answer:

Kinetic energy =1/2mv^2.

1/2×3×3^2.

1/2×27=13.5 or 13 whole number 1/2.

Answer: 20 N

Explanation: Net force is the sum of all forces acting on an object. For example, in a tag of war, when one team is pulling the tag with a force of 100 N and the other with 80 N, the net force would be 20 N at the direction of the first team (100 N - 80 N = 20 N).

Answer:

Horsehair, cotton, or linen

Explanation:

Explanation:

In 1911, Marie was awarded a second Nobel Prize in Chemistry for her discovery of the elements polonium and radium. In honor of the 100-year anniversary of her Nobel award, 2011 was declared the "International Year of Chemistry."

Q3. By using Newton's Divided Difference interpolation, the value of y when x=3 can be determined.

Q4. Using Lagrange's Interpolation method, the value of y can be determined for x=13 from the given data.

Interpolation methods are used to estimate the value of a dependent variable (in this case, y) when the independent variable (x) falls between two known data points. Newton's Divided Difference interpolation and Lagrange's Interpolation method are two commonly used techniques for this purpose.

To find the value of y when x=3 using Newton's Divided Difference interpolation, we can use the given table of data points and interpolate a polynomial function that fits the data. The coefficients of this polynomial can be determined using the divided difference formula. By substituting x=3 into the interpolated polynomial, we can calculate the corresponding value of y.

using Lagrange's Interpolation method, we can also determine the value of y for x=13. This method involves constructing a polynomial function that passes through the given data points. By using the Lagrange interpolation formula, which is based on weighted averages, we can calculate the value of y for the desired x=13.

Interpolation methods are valuable tools in data analysis, curve fitting, and prediction. They allow us to estimate values within a range based on known data points. By utilizing these techniques, we can make informed predictions and fill in missing information between data points.

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Answer:

99 meters

Explanation:

Apply the distance formula:

\( \displaystyle{s = ut + \dfrac{1}{2} g{t}^{2} }\)

where u is initial velocity which is 0 m/s since there is no initial velocity by dropping an object.

t is time which we know is 4.5 seconds. Finally, g is a constant of acceleration due to gravity which on Earth equals to 9.8 m/s². Therefore:

\( \displaystyle{s = 0 \cdot 4.5 + \dfrac{1}{2}(9.8) {(4.5)}^{2} } \\ \\ \displaystyle{s = \dfrac{1}{2}(9.8) {(4.5)}^{2} } \\ \\ \displaystyle{s \approx 99 \: \text{m}}\)

Therefore, the bridge is around 99 meters height.

We can use the formula:v = u + atwhere:v = final velocity of the sprinter, which is 2.0 m/su = initial velocity of the sprinte, , the magnitude of the friction force is 300 N.

To determine the magnitude of the friction force, use the formula for force, F=ma, where m is the mass of the sprinter and a is the acceleration of the sprinter. The friction force is equal in magnitude and opposite in direction to the force of the sprinter's foot pushing backward against the ground.

Mass of the sprinter,

m = 60 kgTime the sprinter's foot is on the ground,

t = 0.40 sInitial velocity of the sprinter, u = 0 m/sFinal velocity of the sprinter,

v = 2.0 m/sWe need to calculate the friction force acting on the sprinter.To do this, we first need to calculate the acceleration of the sprinter. We can use the formula:v = u + where:

v = final velocity of the sprinter, which is 2.0 m/s

u = initial velocity of the sprinter, which is 0 m/st = time for which the foot is on the ground, which is 0.40 s

Substituting these values, we get:2.0

= 0 + a(0.40)Simplifying, we get:

2.0 = 0.4a

Dividing both sides by 0.4, we get:

a = 5 m/s² Substituting the values, we get:

F = 60 × 5F = 300 N

Therefore, the magnitude of the friction force is 300 N.

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Answer:

\(a=\frac{v-u}{t} \\a = \frac{0-250}{12} = -20.83 m/s\)

Explanation:

you mean deceleration right ? because the acceleration is 250m/s

The momentum of the 5kg object before the collision is; 50kgm/s.

The momentum of a body is mathematically evaluated as the product of its mass and velocity of motion.

According to the question;

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