Model a repeating situation with a trig function

Answer Key - Grade 11 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   t (hours after midnight) = 0, 3, 6, 9, 12; h (feet) = 9, 5, 1, 5, 9. Milo records the tide at a harbor. By how many feet does the water rise above its middle level?

   4
2. 2.

   t (minutes) = 0, 15, 30, 45, 60; h (cm above the floor) = 162, 150, 138, 150, 162. Noah measures the minute-hand tip of the classroom clock. What is the amplitude, in cm?

   12
3. 3.

   t (seconds) = 0, 1, 2; h (cm) = 3, 63, 3. Ren walks a bike and tracks the tire valve. What is the midline height, in cm?

   33
4. 4.

   t (minutes) = 1, 3, 5, 7, 9; h (meters) = 3, 18, 33, 18, 3. Ari watches one seat of a Ferris wheel from the ground. How many minutes does one turn take?

   8
5. 5.

   Esme's classroom clock model is h = 15 cos(πt/30) + 150, with t in minutes. What is h at t = 30, in cm?

   135
6. 6.

   Jun's Ferris wheel seat model is h = -16 cos(πt/3) + 18, with t in minutes. What is h at t = 3, in meters?

   34
7. 7.

   Luz sees a Ferris wheel whose lowest seat is 4 m up and whose top seat is 36 m up. How high is the midline, in meters?

   20
8. 8.

   Milo walks a bike; the tire valve goes from 3 cm to 63 cm above the ground. What is the amplitude, in cm?

   30
9. 9.

   Noah reads a tide chart: high tide is 8 ft and low tide is 2 ft. What is the midline, in feet?

   5
10. 10.

    Pia sees a Ferris wheel whose lowest seat is 2 m up and whose top seat is 42 m up. What is the amplitude, in meters?

    20