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Rama09 [41]
3 years ago
10

The first element on the periodic table of elements is helium true of false

Physics
1 answer:
makvit [3.9K]3 years ago
8 0

Answer:

false

Explanation:

it's hydrogen. also hydrogen has one proton and stuff and helium two

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How can you measure mold on food?
Vilka [71]
Trimming the mold of and putting it on a weight scale
6 0
3 years ago
Abox has a mass of 14.4 kg. The length is 4 m longthe width is 1 m and the height is 5 m. What is the density of the box?
valkas [14]

Answer:

0.72 kg per cubic m

Explanation:

Mass = 14.4 kg

Volume = lbh = 4*1*5 = 20 cubic m

\because \: density \\  \\  =  \frac{mass}{volume}  \\  \\  =  \frac{14.4}{20}  \\  \\  = 0.72 \: kg {m}^{ - 3}

3 0
3 years ago
What are the two most important processes in the cycling of oxygen in and out of the atmosphere?
butalik [34]
C. 
It is C because photosynthesis uses CO2 to form O2 and respiration uses O2 to create CO2, both processes filter oxygen through the atmosphere.
5 0
3 years ago
Read 2 more answers
use the periodic table to determine which of the following would be an isotope of bromine (br) check all that apply
gayaneshka [121]

The isotopes of a element is defined as the atoms having same atomic number and different mass number.

As per periodic table Br has atomic umber Z=35 and its atomic mass is given as 79.904 or 79.

As per the question nothing has been mentioned .

so all the atoms whose atomic number will correspond to 35 will be considered as the isotope of bromine.

Generally Bromine exhibits two isotopes which are stable.The isotopes are Bromine-81 and Bromine-77.

Some times during the process of gamma decay Bromine forms many radio isotopes also which are unstable.


5 0
4 years ago
Exercise 2.4.6: Suppose you wish to measure the friction a mass of 0.1 kg experiences as it slides along a floor (you wish to fi
JulijaS [17]

Answer:

  b = 0.6487 kg / s

Explanation:

In an oscillatory motion, friction is proportional to speed,

               fr = - b v

where b is the coefficient of friction

when solving the equation the angular velocity has the form

               w² = k / m - (b / 2m)²

In this exercise we are given the angular velocity w = 1Hz, the mass of the body m = 0.1 kg, and the spring constant k = 5 N / m. Therefore we can disperse the coefficient of friction

             

let's call

               w₀² = k / m

               w² = w₀² - b² / 4m²

               b² = (w₀² -w²) 4 m²

Let's find the angular velocities

             w₀² = 5 / 0.1

             w₀² = 50

             w = 2π f

             w = 2π 1

             w = 6.2832 rad / s

we subtitute

               b² = (50 - 6.2832²) 4 0.1²

               b = √ 0.42086

                b = 0.6487 kg / s

8 0
3 years ago
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