Applications of integration

Practice sheet

Fresh questions from the whole chapter, to do on paper.

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  1. A particle has velocity v(t)=2t+7v(t) = 2t + 7 and starts at s(0)=4s(0) = 4. Find its position at t=5t = 5.
  2. A particle's velocity is v(t)=t−4v(t) = t - 4 m/s. Find the total distance it travels from t=0t = 0 to t=6t = 6, in meters.
  3. v(t)v(t) is a velocity in m/s. What does ∫09∣v(t)∣ dt\displaystyle\int_0^{ 9 } |v(t)|\,dt give?
    1. The total distance traveled from t=0t = 0 to t=9t = 9
    2. The displacement from t=0t = 0 to t=9t = 9
    3. The average speed on [0,9][0, 9]
  4. Find the area of the region between y=5xy = 5x and y=x2y = x^2.
  5. Find the area of the region between y=x2y = x^2 and y=4x−x2y = 4x - x^2.
  6. Find the area between y=1cos⁡xy = 1\cos x and y=1sin⁡xy = 1\sin x for 0≤x≤π40 \le x \le \dfrac{\pi}{4}. Give an exact value.
  7. Find the area of the region between x=y2x = y^2 and x=9x = 9, integrating with respect to yy.
  8. Find the area of the region between x=y2x = y^2 and x=2y+8x = 2y + 8.
  9. Which integral gives the area between x=y2x = y^2 and x=16x = 16?
    1. ∫−44(16−y2) dy\displaystyle\int_{-4}^{ 4 } (16 - y^2)\,dy
    2. ∫016(16−y2) dy\displaystyle\int_0^{ 16 } (16 - y^2)\,dy
    3. ∫−44(y2−16) dy\displaystyle\int_{-4}^{ 4 } (y^2 - 16)\,dy
  10. A solid's base is the region under y=xy = \sqrt{x} for 0≤x≤30 \le x \le 3. Cross-sections perpendicular to the xx-axis are squares. Find its volume.
  11. Same base (under y=xy = \sqrt{x}, 0≤x≤20 \le x \le 2), but the cross-sections are semicircles whose diameter lies in the base. Find the volume.
  12. A solid's base is the triangle under y=4xy = 4x for 0≤x≤40 \le x \le 4. Cross-sections perpendicular to the xx-axis are squares. Find its volume.