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s2008m [1.1K]
3 years ago
7

What type of friction is it when two students are pushing a box that is at rest

Physics
1 answer:
iren [92.7K]3 years ago
4 0
The type of friction this is are Kinetic friction!
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Need help with a physics question.
Verdich [7]

QUESTION:

WHAT IS THE MAGNITUDE OF THE MAGNETIC FIELD AT RIGHT ANGLES TO THE PROTON'S PATH?

ANSWER:

=<em><u>☑</u></em><em><u> </u></em><em><u>2</u></em><em><u>.</u></em><em><u>4</u></em><em><u> </u></em><em><u>T</u></em>

8 0
3 years ago
Expectant mothers many times see their unborn child for the first time during an ultrasonic examination. In ultrasonic imaging,
katrin2010 [14]

Answer:

<em>380 kHz</em>

<em></em>

Explanation:

The speed of sound is taken as 1500 m/s

The length of the fetus is 1.6 cm long

The condition is that the wavelength used must be at most 1/4 of the size of the object that is to be imaged.

For this 1.6 cm baby, the wavelength must not exceed

λ = \frac{1}{4} of 1.6 cm = \frac{1}{4} x 1.6 cm = 0.4 cm =

0.4 cm = 0.004 m   this is the wavelength of the required ultrasonic sound.

we know that

v = λf

where v is the speed of a wave

λ is the wavelength of the wave

f is the frequency of the wave

f = v/λ

substituting values, we have

f = 1500/0.004 = 375000 Hz

==> 375000/1000 = 375 kHz ≅ <em>380 kHz</em>

4 0
3 years ago
Why should flexibility exercises be done in conjunction with strength-building exercises?
bixtya [17]
<span>Flexibility exercises should be done in conjunction with strength-building exercises because: 

</span><span>They work together to maintain your overall level of fitness.
</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
7 0
3 years ago
Read 2 more answers
Technician a says that some passenger vehicles use more than one evaporator. technician b says that some passenger vehicles use
dybincka [34]
<span>Tech A is correct. An evaporator is part of the heat exchange system in a vehicle. Sometimes vehicles will have more than one evaporator, each located in different areas of the vehicle. A condenser is part of the air conditioner system, and only one is normally required.</span>
3 0
3 years ago
If an object on Earth weighs 100N what is its weight in pounds?
oksian1 [2.3K]

Answer:

10.2 lbs

Explanation:

m=F/g

m=100N/9.8

m=10.2040816 lbs

6 0
3 years ago
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