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MakcuM [25]
3 years ago
5

How many valence electrons are in alkali metals

Physics
1 answer:
tatuchka [14]3 years ago
8 0
If you look on the periodic table you will see the top group elements depending on how the elements relate to each in the column. All of the elements in that column show they all have 1 electron in their valence shell. Some of the chemicals in that family or group are Sodium, Lithium, Potassium. The are very reactive because they only have one electron and what 7 more to become stable.
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2. Three blocks, A,B and C of mass 2kg. 3kg. 5kg respectively kept side by side with one another are accelerated at 2m/s2 across
gulaghasi [49]

Answer:

Total mass of combination = 2+3+5 = 10kg.

Acceleration produced = 2m/s^2

hence force =( total mass × acceleration)= (2×10)= 20 N.

Net force on 3kg block = acceleration × mass = (2 × 2 )= 4 N

applied force on 2 kg block = 20N

Force between 2 kg and 3 kg block = (20-4) = 16N. ans

Net force on 3 kg block = 3 × 2 =6N.

Applied force on 3 kg block due to 2 kg block = 16N.

hence, force between 3 kg and 5 kg block = (16-6) = 10N .

answers:-

(a) 20 N

(b) 16N

(c) 10 N

4 0
2 years ago
A copper wire has a radius of 2.9 mm. When forces of a certain equal magnitude but opposite directions are applied to the ends o
REY [17]

Answer:

550000000N/m

Explanation:

Given that a copper wire has a radius of 2.9 mm. When forces of a certain equal magnitude but opposite directions are applied to the ends of the wire, the wire stretches by 5.0×10−3 of its original length.

Original length L = 0.005L

the strain = extension/ original length

the strain = 0.005L / L

the strain = 0.005

Young modulus = stress / strain

11 × 10^10 = stress / 0.005

Cross multiply

Stress = 11 × 10^10 × 0.005

Stress = 550 000000 N/m

Therefore, the tensile stress on the wire is 550000000 N/m.

7 0
3 years ago
Why can't I get a new phone
Alenkasestr [34]

Answer:

Idk I think we all ask the question also this question is for sure prob getting deleted just saying now not by me

Explanation:

3 0
3 years ago
Read 2 more answers
Two resistors with values of 6.0 W and 12 W are connected in parallel. This combination is connected in series with a 4.0 W resi
Zigmanuir [339]
The answer is C. 8.0

Factor in the resistors and take into account the 4.0 W connection. Then do it like you normally would with the 4.0 W included. This will give you 8.0, simple :)

Hope this helped. Have a great day!
8 0
3 years ago
Read 2 more answers
You are operating a pwc. you are heading straight toward a dock. you turn the engine off and then turn the steering control hard
White raven [17]
In this case, the PWC will head for the dock. This is because, power needs to be applied in order to maintain steering control. If the throttle is left to idle or if the engine is turn off during operation, all steering control will be lost. In each of this situation, the PWC will continue in the was headed before the engine was turned off or before the throttle was left to idle.  
6 0
3 years ago
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