b . An 18 ct gold chain contains four grams of pure gold. How much other metal does it contain? c. What is the ratio of gold to other metals in 14 ct gold?
d. What is the ratio of gold to other metals in 9 ct gold?
To calculate the mass of other metals in each scenario, we need to use the given ratios.
Given:
- Pure gold is 24 carats (ct).
- 18 carat gold is an alloy of gold and other metals in the ratio 18:6 (18/24 parts pure gold and 6/24 other metals).
a. A jeweller makes an 18 ct gold alloy using three grams of pure gold. What mass of other metals does she add?
First, let's find the mass of other metals in the 18 ct gold alloy.
18 ct gold contains 18/24 parts pure gold and 6/24 parts other metals. So, if the jeweller uses 3 grams of pure gold, the amount of other metals in the alloy can be calculated as follows:
Mass of other metals = (6/24) * 3 grams
Mass of other metals = (1/4) * 3 grams
Mass of other metals = 3/4 grams
b. An 18 ct gold chain contains four grams of pure gold. How much other metal does it contain?
Similarly, for the 18 ct gold chain containing 4 grams of pure gold:
Mass of other metals = (6/24) * 4 grams
Mass of other metals = (1/4) * 4 grams
Mass of other metals = 4/4 grams
Mass of other metals = 1 gram
c. What is the ratio of gold to other metals in 14 ct gold?
For 14 ct gold, the ratio of gold to other metals is 14:10 (since 14 + 10 = 24, and gold is 14 out of 24 parts, while other metals are 10 out of 24 parts).
d. What is the ratio of gold to other metals in 9 ct gold?
For 9 ct gold, the ratio of gold to other metals is 9:15 (since 9 + 15 = 24, and gold is 9 out of 24 parts, while other metals are 15 out of 24 parts).
a. Find the speed of the skydiver when the parachute opens.
b. Find the distance fallen before the parachute opens.
c. What is the limiting velocity vL after the parachute opens?
d. Determine how long the sky diver is in the air after the parachute opens.
e. Plot the graph of velocity versus time from the beginning of the fall until the sky diver reaches the ground.
B: (x' , y') = (1/2x, 1/2y) <-- Fractions
C: (x' , y') = (4x,4y)
D: (x' , y') = (2x,2y)
The expression representing two times the size of the original polygon is (x' , y') = (2x,2y), hence, option (D) is the correct answer.
A dilation is a transformation that yields a picture that differs in size while maintaining the original image's shape.
The size of the polygon will be doubled if its coordinates are multiplied by 2.
The expression representing the two times the size of the original polygon is (x' , y') = (2x,2y)
Hence, option (D) is the correct answer.
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