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VladimirAG [237]

4 years ago

5

Hi, I was wondering why do in real life we refer our weight as for example 54kg instead of 540N? When we know that weight is a f

orce and the S.I unit is Newton.

1 answer:

Kazeer [188]4 years ago

8 0

Answer:

Chicken nuggets

Explanation:

Because

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Heat energy goes from

kifflom [539]

Answer: Heat moves in three ways: Radiation, conduction, and convection.

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3 years ago

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The four best metallic conductors are: A. gold B. cadmium C. alloys D. copper E. silver F. sodium G. aluminum H. iron I have to

RoseWind [281]

Answer:

Explanation:

I can give you four for certain.

Copper

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3 years ago

A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why

Naya [18.7K]

Answer:

B

Explanation:

Friction always eventually stops whatever is in motion.

4 0

4 years ago

A train is traveling away from you at 120 km/h. it blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound

Vaselesa [24]

Answer:B)439.21 Hz

Explanation:

Given

velocity of train $v=120 km/h\approx 120\times \frac{5}{18}=33.33 m/s$

frequency of train $f_a=0.400 kHz\approx 400 Hz$

speed of sound $c=340 m/s$

frequency from Doppler effect can be calculated by

$f_a=(\frac{c}{c+v})\cdot f$

$400=(\frac{340}{340+33.33})\cdot f$

$400=\frac{340}{373.33}\cdot f$

$f=400\times 1.098$

$f=439.21 Hz$

5 0

3 years ago

Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a frequency of 288 Hz and

mart [117]

Answer:

5.03 m

Explanation:

The wavelength of a wave is given by

$\lambda=\frac{v}{f}$

where

v is the speed of the wave

f is the frequency of the wave

For the sonar signal in this problem,

$f=288 Hz$

$v=1.45\cdot 10^3 m/s$

Substituting into the equation, we find the wavelength:

$\lambda=\frac{1.45\cdot 10^3 m/s}{288 Hz}=5.03 m$

3 0

4 years ago