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lana66690 [7]
3 years ago
11

Why does the quantum mechanical description of many-electron atoms make it difficult to define a precise atomic radius?

Physics
1 answer:
Eddi Din [679]3 years ago
4 0
<span>Atoms and ions, at least within the quantum mechanical model do not have boundaries that are sharply defined at which the electron distribution becomes zero. When this occurs it can be very difficult to measure an atomic radius. The distance between the electrons in quantum mechanics is not set and would be problematic in determining the precise radius.</span>
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Evaluate u+xy where U=3 X=4 Y=7
Reptile [31]

Answer:

31

Explanation:

Given:

U=3

X=4

Y=7

u + xy

Substitute the given values to the equation:

3 + (4)(7)

3 + 28

31

6 0
2 years ago
If 25.0 g of water at 21c is mixed with 45.0 g of water at 75c, what is the final temperature of the mixture?
mrs_skeptik [129]
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3 years ago
Assume that the blocks are accelerating, and the x components of their accelerations at a certain moment are a1x and a2x. find t
Serga [27]

we know that center of mass is given as

r = (m₁ r_{1x} + m₂ r_{2x})/(m₁ + m₂)

taking derivative both side relative to "t"

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taking derivative again relative to "t" both side

dv/dt = (m₁ dv_{1x}/dt + m₂ dv_{2x}/dt)/(m₁ + m₂)

a= (m₁ a_{1x} + m₂ a_{2x})/(m₁ + m₂)

3 0
3 years ago
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alina1380 [7]

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3 0
3 years ago
Imagine that a bowling ball needs to be lifted 1.5 meters, and its gravitational potential energy is 90 joules. How much does th
Vikki [24]

Answer: 6.12 kg

Explanation:

Since Mass of ball = ? (let the unknown value be Z)

Acceleration due to gravity, g= 9.8m/s^2

Height, h = 1.5 metres

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Gravitational potential energy depends on the weight of the ball, the action of gravity and height.

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Z = 90/14.7

Z = 6.12 kg

Thus, the bowling ball weigh 6.12 kilograms

8 0
3 years ago
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