4 years ago

The total number of protons plus neutrons in an atom of ⁴⁵₂₀Ca is

Physics

1 answer:

umka2103 [35]4 years ago

3 0

Answer:

Explanation:

The number of protons plus neutrons in an atom of 45 and 20ca is 65.

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In which of the following processes does the molecules become more orderly?A) water freezing B) ice melting C) water evaporating

Sliva [168]

A) Water freezing

This is called the process of turning water as a liquid to its solid form which is ice.

Ice is almost together as one unlike liquid. This is why the molecules are more orderly.

The process of freezing is exothermic which means the heat has to be removed in the process.

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3 years ago

What is a metallic bond and how does it hold metals together?

Marysya12 [62]

Answer:

Force that holds atoms together in a metallic substance.

Explanation:

Hope this helps? C:

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2 years ago

The Achilles tendon connects the muscles in your calf to the back of your foot. When you are sprinting, your Achilles tendon alt

drek231 [11]

Answer:

5 mm

Explanation:

Youngs's modulus (Y) is described by the following expression:

$Y=\frac{F*L}{\Delta L*A}$

Where F is the force exerted on the tendon, L is its length, A is its area and ΔL is its change in length (stretching).

The force in this case is 8 times the weight of the runner:

$F= 8*m*g\\F= 8*70*9.8\\F=5488 N$

Therefore, the change in length of the tendon is given by:

$\Delta L=\frac{F*L}{Y*A}\\\Delta L=\frac{5488*0.15}{0.15*10^{10}*1.1*10^{-4}}\\\Delta L= 0.004989 m$

the runner's Achilles tendon will stretch by 0.004989 m, which is roughly 5 mm.

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3 years ago

Sasha is interviewing people for a study he is doing. Before he starts the interview, Sasha explains the purpose of the study an

Alex73 [517]

D.

Sasha is informing participants about the study and making sure they wish to participate.

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3 years ago

An object with the mass of 2.0 kg accelerates 2.0 m/s2 when an inknown force is applied to it what is the amount of the force

Ivahew [28]

As per Newton's II law we know that

$F = ma$

here F = force applied

m = mass of object = 2 kg

a = acceleration = 2 m/s^2

now as per above formula we will have

$F = 2 \times 2$

$F = 4 N$

so here applied force on the ball will be 4 N

3 0

3 years ago