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4 years ago

Why are metals sometimes added to gold?

Physics

2 answers:

MrRa [10]4 years ago

8 0

Answer: In order for the mixture of gold and added metals to become hard and suitable for processing.

Explanation: Gold is precious metal, it has a great value, and it used to serve as a means of payment, but also proof of wealth, status and power. Gold as such is soft, and in order to improve hardness it is mixed with another metal, such as nickel, copper, palladium, zinc, etc. For example, white gold is obtained with a mixture of pure gold and nickel, which gives the mixture a white color, and is sufficiently tough suitable for making rings. Based on the composition of the mixture that is the percentage of gold in the mixture, the number of karats is determined, which also means the value of gold itself. For example, the 999 gold has 99.9% of the gold in the mixture, which means 24 K (karats), and represents the so-called mixture with the most valuable percentage of gold, or the purest of which can be purchased.

Komok [63]4 years ago

7 0

Because solo gold isn't strong material. But with admixture it's stronger.

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3 years ago

If the velocity of a pitched ball has a magnitude of 47.0 m/s and the batted ball's velocity is 55.0 m/s in the opposite directi

Naddik [55]

Answer:

14.79 kgm/s

Explanation:

Data provided in the question

Let us assume the mass of baseball = m = 0.145 kg

The Initial velocity of pitched ball = $v_i$ = 47 m/s

Final velocity of batted ball in the opposite direction = $v_f$ = -55m/s

Based on the above information, the change in momentum is

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3 years ago

Vector A= 3.7 i + 1.0 j and vector B = 3.0 i + 6.5 j. What is vector<br> (A-B).A?

kicyunya [14]

Answer:

(A - B).A = -2.91

Explanation:

First, let's define the sum and dot product of vectors.

For two vectors V = (x₁, y₁) and W = (x₂, y₂) we have:

sum (or subtraction):

V + W = (x₁, y₁) + (x₂, y₂) = (x₁ + x₂, y₁ + y₂)

dot product:

V.W = (x₁, y₁).(x₂, y₂) = x₁*x₂ + y₁*y₂

Here remember the notation:

V = x₁*i + y₁*j = (x₁, y₁)

Now let's solve our problem, we have:

A = (3.7, 1.0)

B = (3.0, 6.5)

Then:

(A - B).A = ( (3.7, 1.0) - (3.0, 6.5) ).(3.7, 1.0)

= (3.7 - 3.0, 1.0 - 6.5).(3.7, 1.0)

= (0.7, -5.5).(3.7, 1.0) = (0.7*3.7) + (-5.5)*(1.0) = -2.91

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3 years ago

During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a long barrel.

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Answer:

d. to allow the force of expanding gases from the gunpowder to act for a longer time

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