(Forensic Science)

Officer Piddington has been called to a murder scene. He arrives to find EMTs tending to the victim lying on the living room floor with a large knife protruding from his sternum. It is clear that this is where the crime occurred, and Officer Piddington does not see any evidence of dangerous chemicals on site. He secures the area and then begins to document the scene. What is one of the first things that Officer Piddington records in his notes about the crime scene?

The victim's past criminal history
A description of the crime scene when he arrived
The estimated time of death of the victim
A list of possible suspects involved in the crime

Answer:

275000

Explanation:

momentum = mass * velocity

2500*110=275000

Answer: An orbit cleared of other objects.

There are three basic characteristics that a planet must have. Dwarf planets have two of these characteristics: an orbit and a spherical shape. However, dwarf planet orbits are not cleared of other objects like the orbits of planets.

Answer:

When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation.

Explanation:

Take the direction of motion to be the positive direction. The crate slows to a rest from 30.0 m/s in a matter of 5.0 s, so it has acceleration a such that

0 = 30.0 m/s + a (5.0 s)   →   a = -6.0 m/s²

At the moment its speed is 0, the crate has a net force of s + f acting in negative direction, where s and f denote the magnitudes of the stopping force (s = 250 N) and the friction force, respectively. By Newton's second law, we have

(-s) + (-f) = (100 kg) (-6.0 m/s²)

250 N + f = 600 N

f = 350 N

The friction force is proportional to the normal force by a factor of µ, the coefficient of kinetic friction. There is no movement in the up- and downward directions, so Newton's second law says

(-w) + n = 0

where w is the weight of the crate and n is the magnitude of the normal force. So

n = w = (100 kg) (9.80 m/s²) = 980 N

Then

f = µ n

350 N = µ (980 N)

µ = (350 N) / (980 N) ≈ 0.357

Answer:

All cells come from pre-existing cells

Explanation:

Rudolf Virchow, a German Physician, stated the theory that all cells arise from pre-existing cells. He used this theory to explain disease pathology at the cellular level. His work helped clarify that diseases occur not at tissue or organ level, but at the cellular level. This resulted in more accurate diagnosis of diseases by other scientists.

His legacies includes being among the first to use animals in his research, first to name numerous diseases and also the creation of many medical terms still in use today.

Answer:

The correct option is D.

Explanation:

Water help to maintain homeostasis or regulate body temperature because water has the ability to maintain internal body temperature by responding to the body external temperature. The mechanism water uses to regulate temperature is sweat. When the external temperature is high , sweat. Help to prevent the body from overheating and this water is loss by evaporation and after that there is cooling which regulate the temperature.

Answer:

D

Explanation:)

Answer:

electrical- mechanical

Explanation:

Smartness 1,000

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Answer:

So it's clear that Earth's hot iron core isn't what creates the magnetic field around our planet. ... On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet

Explanation:

answer:

1 or 4

explanation:

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Answer:

A) 1.79ohms

Explanation:

Total resistance of resistors in parallel is given by ;

1/R = 1/R1 + 1/R2 +1/R3

Put in the values and make R the subject

The velocity of an object that has been falling freely in a vacuum

for 4 seconds is 39.2 m/s.

The given parameters;

The value acceleration due to gravity in vacuum is approximately 9.8 m/s².

The final velocity of the object is calculated as follows;

v = u + gt

where;

Substitute the given parameters and solve for v;

v = 0 + 9.8(4)

v = 39.2 m/s

Thus, the velocity of an object that has been falling freely in a vacuum

for 4 seconds is 39.2 m/s.

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Data:

m=0.8kg

g=10m/s2

w=?

Solution:

w=mg

w=(0.8)(10)

w=8N

Result:

weight of the bird is 8N

The acceleration of the cheetahs in the standard international units would be 8.938 meters/second².

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem a cheetah goes from standing still to running at 60  miles per hour in 3 seconds

1 mile = 1609 meters

60 miles = 60×1609 meters

               =96540 meters

1 hour = 3600 seconds

the initial velocity of the cheetah = 0

the final velocity of the = 96540/3600

                                      =26.8166 meters/seconds

acceleration = (final velocity - initial velocity) /time period

                    =(26.8166 -0)/3

                    =8.938 meters/second²

Thus, the cheetah's acceleration would be 8.938 meters/second².

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Answer:

magnitude =

Explanation:

Given an initial velocity of 11200m/s, and acceleration of -70m/s^2, we are told to find the magnitude of the velocity in 10s.

In general, magnitude is defined as the numerical value or quantity of a variable. In physics, magnitude refers to the total measure(length) of distance covered.

Answer:

Kinetic sand is regular sand that's been coated with silicone oil

Explanation:

hope it helps

A sample of matter experiences a decrease in average kinetic energy as it continues to cool. One would anticipate that the particles will eventually come to a complete stop. The temperature at which particles should theoretically stop moving is absolute zero. Thus, option B is correct.

What theory directly contradicts concept of absolute zero?

All molecules are predicted to have zero kinetic energy and, as a result, no molecular motion at absolute zero (273.15°C). Zero is a hypothetical value (it has never been reached).

Absolute zero signifies that there is no kinetic energy involved in random motion. A substance's atoms don't move relative to one another.

Therefore, Kinetic energy because it can create heat which goes against the absolute zero. A gas molecule's kinetic energy tends to zero when the temperature reaches absolute zero.

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The ability to get energy out depends on the material's elasticity. The energy stored in a spring depends on the: Distance the spring is deformed (stretched or compressed) The spring constant, which defines the amount of force required to deform a spring by a certain length (the work done on the spring).

Answer:

a. Chemical changes require a change in composition and physical does not

Explanation:

The main difference between physical and chemical changes is that chemical changes require a change in composition and physical does not.

A chemical change is the change in composition of a substance which is irreversible and a permanent change.

On the other hand, physical change is a temporary change in a substance and can be easily reversible. The composition of a substance do not change in physical composition.

Answer:

5.88 m/s

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 7 m/s

Acceleration (a) = –0.6 m/s²

Distance (s) = 12 m

Final velocity (v) =.?

We, can determine how fast the sprinter is running when he crosses the goal line as follow:

v² = u² + 2as

v² = 7² + (2 × –0.6 × 12)

v² = 49 + (–14.4)

v² = 49 – 14.4

v² = 34.6

Take the square root of both side

v = √34.6

v = 5.88 m/s

Therefore, the sprinter is running at a speed of 5.88 m/s when he crosses the goal line.

Answer:

english or spanish

Explanation:

Answer:

English

Explanation:

Answer:

the answer is  b

Explanation:

The particles in the cold water moved at a slow rate until an increase in temperature caused an increase in particle motion in the hot tea.

According to the kinetic theory of matter, the particles that compose matter are in constant random motion. The particles collide frequently with each other as well as with the walls of the container.

The temperature of the system refers to the average kinetic energy of the molecules of the body. At a lower temperature, the speed of the particles of water is slow. As the temperature increases, more kinetic energy is imparted to the molecules of water and they move faster.

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Answer:

keystone

Explanation:

Answer:

to claim equal rights for all citizens and establish the rule of law required for that to be meaningful

Explanation:

answer:

which war? which revolution? im going to go on a whim and assume you are talking about the american revolution

patriots fought the revolution in order tobecome an independent nation from britian and create a new system of self-governance so that they could claim equal rights for all citizens and establish rule of law.

explanation:

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Answer:

The substance is Ethanol

Explanation:

To solve this problem we must use the expression of thermal energy calculation that relates the mass of a body with the specific heat of this and the temperature difference.

Q = m*Cp*(T_f - T_i)

where:

Q = amount of heat = 14.4 [kJ]

m = mass = 12 [kg]

Cp = specific heat [kJ/kg*K]

T_f = final temperature = 275.5 [K]

T_i = initial temperature = 275 [K]

Therefore we need to calculate Cp, and then compare this with the values in the given table attached.

Cp = 14.4/(12*(275.5 - 275))

Cp = 2.4 [kJ/kg*K]

Now we compare the Cp with the values given in the table.

So the substance is Ethanol

Answer:

yoga postures and breathing techniques in Hatha yoga purify the physical body.

Explanation:

Answer:

I'm pretty sure it's A. long time, small force.

Answer:

B. A large current forms, drops to zero, then a smaller current forms in the opposite direction

Explanation:

The results of Lionel observation about electromagnetic induction is as follows:

In the first step, a large current will form because of the fast or quick movement of the magnet into the right end of a solenoid that generates a  induces emf.

In the second step, the magnet was in rest position for 3 s so the current drops to zero because according to Faraday's law, no voltage will be generated if the magnet held stationary and no voltage means no current.

In the third step, smaller current forms in the opposite direction as the magnet is slowly moving away from the solenoid generating a smaller voltage.

Hence, the correct answer is "B."

Answer:

B

Explanation:

Answer: D. -5

It is -5 because you subtract 13 from 8 to get to the answer.

Answer:

d -5 m

Explanation:

bc 8 subtract by 13 = 5

Answer:

a) W=9000J

b) W=11,666.67 J

c) The work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel. This is about 1.3 times greater.

Explanation:

(The function written in the problem isn't too clearly written, but I believe it should be like this:

A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is [tex]15 000 + 10 000x - 25 000x^{2}[/tex] , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?)

a)

Since the force applied to the bullet is going to vary with the length of the barrel, we will need to make us of integration to find the work done by the gas.

So first, we start by drawing a sketch of what the problem looks like. (See attached picture). This will help us visualize the problem better.

Now, work is defined as the following integral:

[tex]W=\int\limits^a_b {F} \, dx[/tex]

The problem tells us the force exerted by the expanding gas on the bullet is:

[tex]F(x)=15,000+10,000x-25,000x^{2}[/tex]

So we go ahead and substitute this function into the integral.

[tex]W=\int\limits^{0.6}_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]

Now, before integrating that function, we can factor it so it is easier for us to integrate and to deal with the values, so we can factor a common 5,000 out, so we get:

[tex]W=5,000\int\limits^{0.6}_0 {3+2x-5x^{2}} \, dx[/tex]

and we proceed to integrate so we get:

[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^{0.6}_0[/tex]

and evaluate the integral, so we get:

[tex]W=5,000([3(0.6)+(0.6)^2-\frac{5}{3}(0.6)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]

Which yields:

W=9000J

b)

For part b we follow the exact same procedure but we change the limits of integration for 0 and 1 so the integral looks like this:

[tex]W=\int\limits^1_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]

and we get the following answer:

[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^1_0[/tex]

and

[tex]W=5,000([3(1)+(1)^2-\frac{5}{3}(1)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]

so

W=11,666.67 J

c) The difference between the two works we calculated is:

11,666.67J-9000J=2,666.67J

so the work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel.

if we did the following division:

[tex]\frac{11,666.67}{9,000}=1.3[/tex]

So we can see that this is about 1.3 times greater.