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attashe74 [19]
3 years ago
14

John enjoys watching crime shows and his best subject in school was chemistry. What might be a good career for him to explore? I

s it security agent, or Chemical Engineer, or Lawyer, or Forensic Investigator?
Physics
2 answers:
Sauron [17]3 years ago
8 0

Answer: Forensic Investigator

Explanation:

Forensic investigator is the expert who can give his opinion after searching, collecting and analyzing a physical evidences such as chemical, fingerprint, blood or even dead body found at the scene of crime in the court of law.

A forensic investigator can be specialized in the field of chemistry can be a chemical expert. Such an expert can give collect chemical evidences such as drugs, medicines, used syringe, poison obtain from crime scene also can give idea the death occurred due to intoxication by the analysis of blood, urine, hair and viscera obtain after autopsy.

Vera_Pavlovna [14]3 years ago
4 0
The answer is D forensic investigator
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8. A 2 kg flower pot weighing 20 N falls from a window ledge.
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The force of the air resistance is 4 N.

The given parameters;

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Let the air resistance = F

Apply Newton's second law of motion to determine the force of the air resistance acting upward to oppose the motion of the pot falling downwards.

\Sigma F = ma\\\\W - F = ma\\\\a = \frac{W - F}{m} \\\\8 = \frac{20 - F}{2} \\\\20 - F = 16\\\\F = 20 - 16\\\\F = 4 \ N

Thus, the force of the air resistance is 4 N.

Learn more here: brainly.com/question/19887955

8 0
3 years ago
A wire of Nichrome (a nickel– chromium– iron alloy commonly used in heating elements) is 1.0 m long and 1.0 mm² in cross-se
Lyrx [107]

Answer:

The conductivity of Nichrome is 2\times 10^6\ S/m.

Explanation:

Given:

Potential difference (V) = 2.0 V

Current flowing (I) = 4.0 A

Length of wire (L) = 1.0 m

Area of cross section of wire (A) = 1.0 mm² = 1 × 10⁻⁶ m² [1 mm² = 10⁻⁶ m²]

We know, from Ohm's law, that the ratio of voltage and current is always a constant and equal to the resistance of the resistor. Therefore, the resistance of the nichrome wire is given as:

R=\frac{V}{A}=\frac{2.0}{4.0}=0.5\ \Omega

Now, resistance of the nichrome wire in terms of its resistivity, length and area of cross section is given as:

R=\rho\frac{L}{A}

Where, \rho\to resistivity\ of\ Nichrome

Now, plug in all the values given and solve for \rho. This gives,

0.5\ \Omega=\rho\frac{1.0\ m}{1\times 10^{-6}\ m^2}\\\\\rho=\frac{0.5\times 1\times 10^{-6}}{1.0}=0.5\times 10^{-6}\ \Omega-m

Now, conductivity of a material is the reciprocal of its resistivity. Therefore, the conductivity of Nichrome is given as:

\sigma=\frac{1}{\rho}=\frac{1}{0.5\times 10^{-6}}=2\times 10^6\ S/m

Conductivity is measured in Siemens per meter (S/m)

Therefore, the conductivity of Nichrome is 2\times 10^6\ S/m.

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