PHYSICS COLLEGE

In a sample of 18-karat gold, 75 percent of the total mass is pure gold, while the rest is typically 16 percent silver and 9 percent copper. If the density of pure gold is rhogold=19.3g/cm3, while the densitites of silver and copper are respectively rhosilver=10.5g/cm3 and rhocopper=8.90g/cm3, what is the overall density rho18kt of this alloy of 18-karat gold?

Answers

Answer 1
Answer:

Answer:

15.57 g/cm³

Explanation:

= Density of gold = 19.3 g/cm³

= Density of silver = 10.5 g/cm³

= Density of copper = 8.9 g/cm³

Assuming total mass as 1000 g

Volume of gold

Volume of silver

Volume of copper

Density of the alloy would be

The overall density of this alloy is 15.57 g/cm³


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MIDDLE SCHOOL

I need help with high school chemistry!!! Can someone help

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I can see what i can do if you need assistance
COLLEGE

A 20 m high filled water tank develops a 0.50 cm hole in the vertical wall near the base. With what speed does the water shoot out of the hole? a) 30 m/s b)15 m/s
c) 25m/s
d) 20 m/s

Answers

Answer:

The speed of the water shoot out of the hole is 20 m/s.

(d) is correct option.

Explanation:

Given that,

Height = 20 m

We need to calculate the velocity

Using formula Bernoulli equation

Where,

v₁= initial velocity

v₂=final velocity

h₁=total height

h₂=height of the hole from the base

Put the value into the formula

Hence, The speed of the water shoot out of the hole is 20 m/s.

HIGH SCHOOL

Find the circumference of a circle whose area is 452.16 square meters. (Use 3.1416 as the value of .) A. 12 meters
B. 37.6992 meters
C. 24 meters
D. 75.3984 meters



9. What is the volume of a cube shaped box with edges 6 cm. in length?
A. 216 cu. cm.
B. 1,296 cu. cm.
C. 36 cu. cm.
D. 18 cu. cm.

Answers

1) The area of a circle is given by

where r is the radius of the circle. In this problem, we are told that the area is

so we can rearrange the previous equation to calculate the radius:


And now we can find the circumference, by using the formula:

Therefore, the correct answer is D. 75.3984 meters.



2) The volume of a cube is given by:

where L is the length of the edge. In this problem, L=6 cm, therefore the volume of the cube is


and so, the correct answer is A. 216 cu. cm.

Answer:

D. 75.3984 meters

Explanation:

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Through with one of the following mediums is the velocity of a sound wave the greatest? A.Steel
B.Air
C.Water
D.Lead

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Steel is the answer because it travels 5,060 meter per second.
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