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Evgesh-ka [11]
2 years ago
10

All the actinoids, atomic number 89 through 103 have seven electron orbits. True False

Physics
1 answer:
Pie2 years ago
7 0
Answer is: true.
Actinoids are in 7 period in Periodic table and valence orbit is 7s².
Ac - [Rn] 6d¹ 7s².
Th - [Rn] 6d² 7s².
Pa - [Rn] 5f² 6d¹ 7s².
U - [Rn] 5f³ 6d¹ 7s².
Np - [Rn] 5f⁴ 6d¹ 7s².
Pu - [Rn] 5f⁶ 7s².
Am - [Rn] 5f⁷ 7s².
Cm - [Rn] 5f⁷ 6d¹ 7s².
Bk - [Rn] 5f⁹ 7s².
Cf - [Rn] 5f¹⁰ 7s².
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A transport plane takes off from a level landing field with two gliders in tow, one behind the other. The mass of each glider is
velikii [3]

Answer:

(a)  Length =136.58 m

(b)  T=5995 N

Explanation:

for the glider in the back

T - 1900 = 700 a

for the glider in front

12000-T -1900 = 700a

add equations

12000-3800 = 1400 a

a=5.85 m/s^2

v^2 = v0^2 + 2 a x

40^2 = 2*5.85*x

Length =136.58 m

b) plug the a back into one of the previous formula

T -  1900 = 700*5.85

T=5995 N

8 0
3 years ago
What is happening when two waves with identical crests and troughs meet?
GenaCL600 [577]

Answer:

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7 0
2 years ago
A driver sets out on a journey. for the first half of the distance she drives at the leisurely pace of 30 mi/h; during the secon
Gemiola [76]
The average speed of a moving object is the rate of change of a certain distance with respect with time. It is equal to the total distance that was traveled by the object over the total time it takes to travel that distance. For this problem we need to assume that the total distance that was traveled would be equal to 120 miles. So, for the first half of the distance or 60 miles at a speed of 30 miles per hour, the time taken would be two hours. For the remaining 60 miles at a speed of 60 miles per hour, 1 hour is total time traveled. So, we calculate the average speed as follows:

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5 0
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sveta [45]

Answer:

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Ultraviolet waves would be best used to sterilize a surface expose to bacteria because it will completely destroy them.

Most medical equipment are usually sanitized by using this rays because the DNA of most bacteria can be innervated upon exposure to these ray.

Ultraviolet rays are energetic and more powerful than the normal visible light and subsequent long wavelength radiations.

Generally, ultraviolet rays is a very harmful electromagnetic radiation.  

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2 years ago
Please help? physics question...
ratelena [41]

I believe the answer is A.

Hope This Helps!   Have A Nice Day!!

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