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3 years ago

States that there is an exchange of materials when two objects come into contact with each other

Physics

1 answer:

pishuonlain [190]3 years ago

3 0

"Edmond Locard" states that there is an exchange of materials when two objects come into contact with each other.

<u>Explanation:</u>

A French criminologist who was popular as the "Sherlock Holmes of France," the pioneer in forensic science named as Dr. Edmond Locard. He articulated forensic science's fundamental principle "Each touch leaves a trace." This became known as Locard's philosophy of exchange. A Locard hypothesized that each and every time you touch another person, place or object, the result would be an exchange of materials. Burglars, for instance, will leave evidence of their existence behind and take traces with them too.

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a toaster has a heating element of 15 ohms and is connected to 120 volt outlet. show that the current drawn by the toaster is 8

algol13

Answer:

Explanation:

Ohm's law:

V = IR

Given V = 120 V and R = 15 Ω:

120 V = I (15 Ω)

I = 8 A

4 0

3 years ago

The half-life of uranium-235 is 713 million years. Suppose a rock originally had 26 grams of uranium-235. A geologist had the ro

BlackZzzverrR [31]

Answer:

<h3>2139 Million years</h3>

Explanation:

Half life of a material is the time required for the material to decay into half of initial amount.

initially there is 26 grams of uranium-235, and the final amount is 3.25 gram

ratio between initial and final amount = $\frac{26}{3.25} = \frac{1}{8}$

now it is clear that the material have halved 3 times from initial condition

number of half lives passed = 3

number of half lives passed can also be found using the equation

no of half lives = $log_{2} \frac{R_{0} }{R}$

where $R_{0}$ is the initial amount of material and R is the final amount

∵ Number of half lives = $log_{2} \frac{26 }{3.25}$

= 3

So, age of rock = half-life X number of half-lives passed

=713000000 X 3

= 2139000000

=2139 Million Years

7 0

3 years ago

We push a 38.4-kg box across the floor at constant velocity. If we are pushing a horizontal force of 238 N, find the coefficient

zmey [24]

Answer: 0.62

Explanation:

Coefficient of friction is defined as the ratio of the moving force (Fm) acting on a body to the normal reaction (R).

Note that the normal reaction acts vertically on the object and is equal to the objects weight (W) i.e W=R

Since W = mg, W = 38.4 ×10

W= 384N =R

Normal reaction = 384N

The horizontal force acting on the body will be the moving force which is 238N

Coefficient of friction = Fm/R

Coefficient of friction = 238/384

Coefficient of friction = 0.62

Therefore, coefficient of kinetic friction between the box and the floor is 0.62

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4 years ago

What groups have similar roles: Coaches and officials Fans and parents Players and officials o Fans and coaches

Ksenya-84 [330]

Answer:

Fans and Parents

Explanation:

Fans and Parents have similar roles because they are both saddled with the responsibility of encouraging /cheering their team and wards respectively.

Both of them are also involved in the defense of their teams/ wards best interests, however, the methods involved in the processes are usually quite different.

These points makes it the best and most suitable answer in the list of options.

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3 years ago

20. Consider two Stars A and B with temperatures Ta and TB and radii Ra and RB respectively. If TA

Rus_ich [418]

Answer:

$L_A = 9 L_B$