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GaryK [48]
3 years ago
9

An atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has ______ neutrons in its nucleus.

Physics
2 answers:
Sedbober [7]3 years ago
8 0

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FromTheMoon [43]3 years ago
6 0
A=atomic mass 
Z=atomic number  (nº of protons).
N=neutons.

A=Z+N

Data:
A=39
Z=19

A=Z+N
39=19+N
N=39-19=20.

It therefore has 20 neutrons in its nucleus.
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A box is dropped onto a conveyor belt moving at 3.2 m/s. If the coefficient of friction between the box and the belt is 0.28, ho
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Answer:

t = 1.16 s.

Explanation:

Given,

speed of conveyor belt, v = 3.2 m/s

coefficient of friction,f = 0.28

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equating both the force equation

a = μ g

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a = 2.75 m/s²

Using Kinematic equation

v = u + at

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A body is travelling with a velocity 30 m/s².what will be its velocity after 4s?​
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Given the information below, estimate the total distance travelled during these 6 seconds using a left endpoint approximation. t
Nutka1998 [239]

Answer:

184 feets

Explanation:

Given the data:

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0 __________30

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3 __________34

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6 __________22

Using left end approximation:

(0,1) ___ f(0) = 30

(1,2) ___ f(1) = 54

(2,3) ___f(2) = 56

(3,4) ___f(3) = 34

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Hence, the Total distance traveled during the 6 second interval is:

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4 0
2 years ago
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