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3 years ago

Oxygen (O2) is best described as which of the following: An element A compound A mixture

Physics

1 answer:

valentina_108 [34]3 years ago

4 0

Answer:

in it's natural state it's an element

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2. An object with a mass of 3.8 kg has four forces acting on it.

marshall27 [118]

Answer:4.7N

Explanation:both of the sides are equal

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3 years ago

A light wave with a wavelength of 612nm in a vacuum travels through a bit of fused quartz which has an index of refraction of n=

Korolek [52]

The answer is chicken nuggets
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4 years ago

The

guapka [62]

The NUCLEUS is the center of the atom. it contains protons and NEUTRONS

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3 years ago

A fillet weld has a cross-sectional area of 25.0 mm2and is 300 mm long. (a) What quantity of heat (in joules) is required to acc

HACTEHA [7]

Answer:

77362.56 J

163730.28571 J

Explanation:

A = Area = 25 mm²

l = Length = 300 mm

K = Constant = $3.33\times 10^{-6}$

$\eta$ = Heat transfer factor = 0.75

$f_m$ = Melting factor = 0.63

T = Melting point of low carbon steel = 1760 K

Volume of the fillet would be

$V=Al\\\Rightarrow V=25\times 300\\\Rightarrow V=7500\ mm^3=7500\times 10^{-9}\ m^3$

The unit energy for melting is given by

$U_m=KT^2\\\Rightarrow U_m=3.33\times 10^{-6}\times 1760^2\\\Rightarrow U_m=10.315008\ J/mm^3$

Heat would be

$Q=U_mV\\\Rightarrow Q=10.315008\times 7500\\\Rightarrow Q=77362.56\ J$

Heat required to weld is 77362.56 J

Amount of heat generation is given by

$Q_g=\dfrac{Q}{\eta f_m}\\\Rightarrow Q_g=\dfrac{77362.56}{0.75\times 0.63}\\\Rightarrow Q_g=163730.28571\ J$

The heat generated at the welding source is 163730.28571 J

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4 years ago

Help ASAP <br> Just answer the first question for me please!

Usimov [2.4K]

Answer:

Im pretty sure its b

4 0

3 years ago