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7th Grade WOW ME
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Gravity
Terms in this set (31)
6
What is the constant of proportionality?
46
What is the constant of proportionality?
200
What is the constant of proportionality?
750
What is the constant of proportionality?
60
What is the constant of proportionality?
47
What is the constant of proportionality?
10
What is the constant of proportionality?
3/2
What is the constant of proportionality?
20
What is the constant of proportionality?
4
What is the constant of proportionality?
40
What is the constant of proportionality?
16
What is the constant of proportionality?
Unit Rate
a ratio that compares a quantity to one unit of a different quantity
Ratio
Comparison of two quantities
Constant of Proportionality
The constant ratio between two quantities: y=kx, where k is the constant of proportionality.
Rate of Change
Change in y/ Change in x
A climber is on a hike. After 2 hours he is at an altitude of 400 feet. After 6 hours, he is at an altitude of 700 feet.
What is the average rate of change?
75 ft
A scuba diver is 30 feet below the surface of the water 10 seconds after he entered the water and 100 feet below
the surface after 40 seconds. What is the scuba divers rate of change?
-2.33 ft/sec
A rocket is 1 mile above the earth in 30 seconds and 5 miles above the earth in 2.5 minutes. What is the rockets rate of change in miles per second? What about miles per minute.
2 miles/minute or .033 miles per second
A teacher weighed 165 lbs in 1996 and weighs 205 lbs in 2006. What was the rate of change in weight?
+4 pounds per year
Let's pretend that over the last 50 years, the average temperature has increased by 2.5 degrees worldwide. What is the rate of change in worldwide temperatures per year?
+.05 degrees each year
A plane left Chicago at 8:00 A.M. At 1: P.M., the plane landed in Los Angeles, which is 1500 miles away. What
was the average speed of the plane for the trip?
300 miles per hour OR
5 miles per minute
If k=y/x and the rate is 6:3. Then the constant is =
2
If k=y/x and the rate is 36:3. Then the constant is =
12
If k=y/x and the rate is 40:5. Then the constant is =
8
If k=y/x and the rate is 45:5. Then the constant is =
9
If k=y/x and the rate is 55:5. Then the constant is =
11
If k=y/x and the rate is 42:7. Then the constant is =
6
If k=y/x and the rate is 18:9. Then the constant is =
2
If k=y/x and the rate is 27:9. Then the constant is =
3
If k=y/x and the rate is 45:9. Then the constant is =
5
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