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taurus [48]
3 years ago
10

The number of electrons in an element with atomic number 20 is

Physics
2 answers:
Wewaii [24]3 years ago
7 0

The number of electrons in an element with atomic number 20 is calcium

Alex787 [66]3 years ago
5 0

Answer:

the answer is calcium....

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3 years ago
A 7 ft tall person is walking away from a 20 ft tall lamppost at a rate of 5 ft/sec. Assume the scenario can be modeled with rig
aleksandr82 [10.1K]

Answer:

The rate of change of the shadow length of a person is 2.692 ft/s

Solution:

As per the question:

Height of a person, H = 20 ft

Height of a person, h = 7 ft

Rate = 5 ft/s

Now,

From Fig.1:

b = person's distance from the lamp post

a = shadow length

Also, from the similarity of the triangles, we can write:

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a = \frac{7}{13}b

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Thus

\frac{da}{dt} = \frac{7}{13}.\times 5 = 2.692\ ft/s

5 0
3 years ago
An inclined plane is 5.00 m long and 3.00 m high. What is the ideal mechanical advantage of this machine?
Dvinal [7]
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so 5/2= 2.5 

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A 0.125 kg hockey puck moving at 20.0 m/s is caught and held by an 85.0 kg goalkeeper at rest. After catching the puck, with wha
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4 0
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Answer:

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2 years ago
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