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3 years ago

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

Physics

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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Our ancestors are our guides?

aleksandr82 [10.1K]

Answer:

yes

Explanation:

we can clearly say that our ancestor are our guide.

Because of they give us different knowledge about evolution of life and etc.

4 0

3 years ago

3.972 kilometers is the same distance as how many centimeters? (Remember to include units in your answer)

Helga [31]

Answer:

397200 centimeters

4 0

4 years ago

Determine the pressure P of a 450K Oxygen gas in a gas chamber when its initial pressure is 175Pa has a temp 300K

FrozenT [24]

Answer:

262.5Pa

Explanation:

Given parameters:

P1 = 175Pa

T1 = 300K

T2 = 450K

Unknown:

P2 = ?

Solution:

To solve this problem, we are going to use an adaptation of the combined gas law.

$\frac{P1}{T1}$ = $\frac{P2}{T2}$

Insert the parameters and solve;

$\frac{175}{300}$ = $\frac{P2}{450}$

P2 = 262.5Pa

8 0

4 years ago

Full explanation please I’m asking kindly

-Dominant- [34]

1).

Time = (distance) / (speed)

Time = (1000 meters) / (331 m/s)

<em>Time = 3.02 seconds</em>

2).

Acceleration = (change in speed) / (time for the change)

Change in speed = (second speed) - (first speed)

Change in speed = (50 m/s) - (20 m/s) = 30 m/s

Acceleration = (30 m/s) / (5 seconds)

<em>Acceleration = 6 m/s²</em>

5 0

3 years ago

A sanding disk with rotational inertia 3.8 x 10-3 kg·m2 is attached to an electric drill whose motor delivers a torque of magnit

Elis [28]

Answer:

(a) Angular momentum of disk is $1.343\, \frac{kg.m^{2}}{s}$

(b) Angular velocity of the disk is $353\frac{rad}{s}$

Explanation:

Given

Rotational inertia of the disk , $I=3.8\times 10^{-3}kg.m^{2}$

Torque delivered by the motor , $\tau =17N.m$

Torque is applied for duration , $\Delta t=79ms=0.079s$

(a)

Magnitude of angular momentum of the disk = Angular impulse produced by the torque

$\therefore L=\tau \Delta t=17\times 0.079\frac{kg.m^{2}}{s}$

=> $L=1.343\, \frac{kg.m^{2}}{s}$

Thus angular momentum of disk is $1.343\, \frac{kg.m^{2}}{s}$

(b)

Since Angular momentum , $L=I\omega$

where $\omega$ = Angular velocity of the disk

$=>\omega =\frac{L}{I}=\frac{1.343}{3.8\times 10^{-3}}\frac{rad}{s}$

$\therefore \omega =353\frac{rad}{s}$

Thus angular velocity of the disk is $353\frac{rad}{s}$

5 0

4 years ago