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3 years ago

7

A lab technician needs to clean medical instruments that have been exposed to bacteria. Which electromagnetic wave

1 answer:

sveta [45]3 years ago

3 0

Answer:

Ultraviolet wave

Explanation:

Ultraviolet waves would be best used to sterilize a surface expose to bacteria because it will completely destroy them.

Most medical equipment are usually sanitized by using this rays because the DNA of most bacteria can be innervated upon exposure to these ray.

Ultraviolet rays are energetic and more powerful than the normal visible light and subsequent long wavelength radiations.

Generally, ultraviolet rays is a very harmful electromagnetic radiation.

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Tarnish is produced by a redox reaction that occurs when a metal reacts with

Dvinal [7]

Answer:

Copper atoms lose electrons to sulfur atoms

Explanation:

a p e x (:

6 0

3 years ago

In which situations is gravitational potential energy present? Check all that apply.

lukranit [14]

A person walks up a flight of stairs √
Wind lifts a balloon into the air √
A weightlifter holds a barbell straight overhead √

Gravity is used in most real world examples because if not of gravity everyone would be floating all around ^-^

Hope this helps ;p

8 0

3 years ago

Read 2 more answers

A car traveling at 28.0 m/s hits a bridge abutment. A passenger in the car, who has a mass of 49.0 kg, moves forward a distance

BaLLatris [955]

The final velocity of the passenger is zero as he is brought to rest by the inflated bag.

$V_f = 0$

Apply the equation of motion

$V_f^2 = V_i^2 +2as$

Replacing with our values,

$0 = 28^2+2(a)(0.55)$

$a = \frac{28^2}{2(0.55)}$

$a = 712.72m/s^2$

Calculate the force using the force equation,

$F = ma$

$F = (49kg)(712.72m/s^2)$

$F = 34.923kN$

Therefore the magnitude of force acts on the passenger's upper torso is 34.923kN

3 0

3 years ago

A student is experimenting with some insulated copper wire and a power supply. She winds a single layer of the wire on a tube wi

OverLord2011 [107]

Answer:

$P=214.7187\,W$

Explanation:

Given that:

Diameter of the solenoid, $D=10\,cm=0.1\,m$

length of the solenoid, $L=90\,cm=0.9\,m$

diameter of the wire, $d=0.1\,cm=10^{-3}\,m$

magnetic field at the center of the solenoid, $B=7.4\times 10^{-3}\,T$

<u>Now we need the no. of turns incorporated in the length of 90 cm:</u>

$N=\frac{Length\,\,of\,\,solenoid}{diameter\,\,of\,\, wire}$

$N=\frac{L}{d}$

$N=\frac{0.9}{10^{-3}}$

$N=900\,\,turns$

For solenoids we have:

$B=\mu.n.I$ ...............................(1)

where:

$\mu=$ permeability of the medium

n = no. of turns per unit length

I = current in the coil

So,

$n=\frac{900}{0.9}$

$n=1000\,turns\,.\,m^{-1}$

Now putting the respective values in the eq. (1)

$7.4\times 10^{-3}=4\pi\times10^{-7}\times 1000\times I$

$I=5.8887\,A$

For copper we have resistivity:

$\rho=1.72\times 10^{-8}\, \Omega.m$

We know that resistance is given by:

$R=\rho.\frac{l}{a}$ .....................................(2)

where:

l = length of the conducting wire

a = cross sectional area of the conducting wire

<u>Now we need the length (l) of the wire:</u>

Circumference of the solenoid,

$C=\pi.D$

$C=0.1\pi\,m$

$\therefore l=C\times N$

$l=90\pi\,m$

&

<u>Cross-sectional area of wire:</u>

$a=\pi.\frac{d^2}{4}$

$a=\pi. \frac{(10^{-3})^2}{4}\,m^2$

<u>Resistance from eq. (2):</u>

$R=1.72\times 10^{-8}\times \frac{90\pi}{\pi. \frac{(10^{-3})^2}{4}}$

$R=6.192 \,\Omega$

For power we have:

$P=I^2.R$

$P=5.8887^2 \times 6.192$

$P=214.7187\,W$

6 0

3 years ago

True or False<br> Temperature is the flow of heat energy from one object to another.

marin [14]

Answer:

False

Temperature is the flow of heat energy from one object to another.

Explanation:

5 0

4 years ago