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4 years ago

3. Electrons move about the nucleus of an atom in regions called _____.

2 answers:

6 0

A. electron cloud

the others being bcd are wrong because b is the center of a atom where the protons and neutrons are c because air does notexist at that scale and d is just the different types of a atom

irakobra [83]4 years ago

5 0

Electrons move about the nucleus of an atom in regions called Electron clouds.
This term is used to describe where electrons are when when they go around the nuclear of an atom.

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Why is alpha rays not suitable to scan baggage at the airport?

Inga [223]

Answer:

Alpha particles are not used to check baggage in airport as these rays are not penetrated far through matter.

Explanation:

Alpha particles are produced by the decay of a radioactive nucleus. These alpha rays are ceased by paper. The nucleus of the helium atom is made up of two protons and two neutrons is the particle ejected by alpha particle.

As helium is harmless and as an inert gas, so these particles are not dangerous in themselves. The airport baggage security uses only X-ray scanners to inspect. These rays identify the hidden items inside the baggage.

4 0

3 years ago

On a riding lawn mower how long does it take to cut 5 acres

defon

3 hours or so on your average riding lawn mower. Can depend on the length of the grass and the deck size of mower. Round about... 3 hours.

7 0

3 years ago

How would you find the speed of a ball thrown in to the air- it takes 6 seconds to get tho the top. The height is not given.

Alecsey [184]

You would need to know how fast you threw the ball in the air once that then multiply the seeped and the time to get your answer

7 0

3 years ago

Calculate the mass of the earth if the radius of the earth is 6.38 × 10^6

Delicious77 [7]

Answer:

Explanation:

C is i thing

7 0

3 years ago

A 5.50-kg object is hung from the bottom end of a vertical spring fastened to an overhead beam. The object is set into vertical

iris [78.8K]

Answer:

17.71N/m

Explanation:

The period of the spring is expressed according to the expression;

$T = 2 \pi \sqrt{\frac{m}{k} } \\$

m is the mass of the object

k is the force constant

Given

m = 5.50kg

T = 3.50s

Substitute into the formula;

$T = 2 \pi \sqrt{\frac{m}{k} } \\3.5 = 2 (3.14) \sqrt{\frac{5.5}{k} } \\3.5 = 6.28 \sqrt{\frac{5.5}{k} } \\\frac{3.5}{6.28} = \sqrt{\frac{5.5}{k} } \\0.557 = \sqrt{\frac{5.5}{k} } \\square \ both \ sides\\0.557^2 = (\sqrt{\frac{5.5}{k} })^2 \\0.3106 = \frac{5,5}{k}\\k = \frac{5.5}{0.3106}\\k = 17.71N/m$

Hence the force constant of the spring is 17.71N/m

4 0

3 years ago