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3 years ago

7

If the force produced by the engine is 3400 N to the right and the force caused by friction is 400 N to the left, what is the NE

T FORCE on the car?

2 answers:

lisov135 [29]3 years ago

6 0

Answer:

2400/400

Explanation:

AlladinOne [14]3 years ago

6 0

2400/40 would be the correct answer lmk if its correct

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Write the isotopic symbol for the following (show your work) a) An isotope of iodine whose atoms have 78 neutrons b) An isotope

morpeh [17]

<u>Answer:</u>

<u>For a:</u> The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

<u>For b:</u> The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

<u>For c:</u> The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

<u>Explanation:</u>

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

<u>For a:</u>

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

<u>For b:</u>

We are given:

Number of neutrons = 82

Atomic number of cesium = 55 = Number of protons

Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

<u>For c:</u>

We are given:

Number of neutrons = 52

Atomic number of strontium = 38 = Number of protons

Mass number = 38 + 52 = 90

Thus, the isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

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A nugget of gold has a mass of 28 grams and a volume of 1.45 cubic centimeters. What is the density?

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Answer:

0.01931034

Explanation:

Steps:

ρ = m/v

=

28 gram

1.45 cubic meter

= 19.310344827586 gram/cubic meter

= 0.019310344827586 kilogram/cubic meter

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