Study 2.6, p. 154 # 1 19, Goal: 1. Understand how variables change with respect to time. 2. Understand "with respect to".
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1 Study 2.6, p. 154 # 1 19, Goal: 1. Understand how variables change with respect to time. 2. Understand "with respect to". water drop ripples pour cement high 1:30 water drop ripples pour cement high 1:30 Goal: Understand how variables change with respect to time. water drop ripples What variables are changing? with respect to what? r increasing w respect to time A increasing w respect to time and r water drop ripples G. Battaly
2 Related Rates pour cement high 1:30 Goal: Understand how variables change with respect to time. What variables are changing? with respect to what? h dna,r,emit ot tcepser w gnisaerced V r dna emit ot tcepser w gnisaerced A emit ot tcepser w gnisaerced h emit ot tcepser w gnisaerced r pour cement high rise Refer to problems # geogebra: Related Rates What is common to all these problems? rate of change of distance with respect to time rate of change of volume with respect to time rate of change of area with respect to time G. Battaly
3 G: xy = 6 F: dy/dx at ( 6, 1) From the previous section: implicit diff. How can we interpret dy/dx = 1/6? slope of tangent line at ( 6, 1) ALSO, INSTANTANEOUS RATE OF CHANGE of y with respect to x! When rate of change is with respect to time instead, how do you decide what variables to use? How do you proceed? Example: An airplane is flying at an altitude of 5 miles and passes directly over a radar antenna. When the plane is 10 miles away, the radar detects that the distance S is changing at a rate of 240 miles per hour. What is the speed of the plane? G: altitude 5 mi; when plane 10 mi away, S changing at 240 mph F: speed of plane 5 rate of change with respect to time geogebra: Related Rates 6. Check: Did you include units? Yes Does the answer make sense? Yes. dh/dt is directly proportional to S and inversely prop. to H, so it should be larger than ds/dt. If there were angles involved, did you use radians? No angles G. Battaly
4 step by step n formula. An airplane is flying at an altitude of 5 miles and passes directly over a radar antenna. When the plane is 10 miles away, the radar detects that the distance S is changing at a rate of 240 miles per hour. What is the speed of the plane? F: speed of plane G: altitude 5 mi; when plane 10 mi away, S changing at 240 mph Variables H and S Then rates of change: geogebra: Related Rates 1. Identify: a "given" rate, a "to find" rate, other variables Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. (Not needed here.) 4. Differentiate implicitly with respect to time. This always involves the chain rule. 5. Substitute the given values and solve for the unknown rate. 6. Check: Did you include units? Yes Does the answer make sense? Yes. dh/dt is directly proportional to S and inversely prop. to H, so it should be larger than ds/dt. If there were angles involved, did you use radians? No angles G. Battaly
5 geogebra: Related Rates An airplane is flying at an altitude of 5 miles and passes directly over a radar antenna. When the plane is 10 miles away, the radar detects that the distance S is changing at a rate of 240 miles per hour. What is the speed of the plane? G: altitude 5 mi; F: speed of plane when plane 10 mi away, S changing at 240 mph Variables H and S Then rates of change: 1. Identify: a "given" rate, a "to find" rate, other variables Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. (Not needed here.) 4. Differentiate implicitly with respect to time. This always involves the chain rule. remember F: speed of plane 5. Substitute the given values and solve for the unknown rate. need H: (from above) 6. Check: Did you include units? Yes Does the answer make sense? Yes. dh/dt is directly proportional to S and inversely prop. to H, so it should be larger than ds/dt. If there were angles involved, did you use radians? No angles G: Using a rope, a worker pulls a 5 m plank up the side of a building at a rate of 0.15 m/s. F: How fast sliding on ground when 2.5 m from building? 1. Identify: a "given" rate, a "to find" rate, other variables m/s 5 m 2. Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. (Not needed here.) 4. Differentiate implicitly with respect to time. This always involves the chain rule.? m/s 5. Substitute the given values and solve for the unknown rate. 6. Check: Did you include units? Yes Does the answer make sense? Yes. x is decreasing If there were angles involved, did you use radians? No angles G. Battaly
6 G: Using a rope, a worker pulls a 5 m plank up the side of a building at a rate of 0.15 m/s. F: How fast sliding on ground when 2.5 m from building? 1. Identify: a "given" rate, a "to find" rate, other variables. 2. Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. (Not needed here.) 4. Differentiate implicitly with respect to time. This always involves the chain rule. 5. Substitute the given values and solve for the unknown rate. 6. Check: Did you include units? Yes Does the answer make sense? Yes. x is decreasing If there were angles involved, did you use radians? No angles F: How fast sliding on ground when 2.5 m from building? 1. Identify: a "given" rate, a "to find" rate, other variables. 2. Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. (Not needed here.) 4. Differentiate implicitly with respect to time. This always involves the chain rule. 5. Substitute the given values and solve for the unknown rate. need y: (from above) 6. Check: Did you include units? Yes Does the answer make sense? Yes. x is decreasing If there were angles involved, did you use radians? No angles G. Battaly
7 12 y 12 y s x 12 x y A winch at the top of a 12 m building pulls a 12 m pipe to a vertical position. The winch pulls in the rope at a rate of 0.2 m/sec. Find the rate of vertical change and the rate of horizontal change at the end of the pipe when y = 6. (x,y) 1. Identify: a "given" rate, a "to find" rate, other variables. 2. Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. 3. If possible, use the given information to reduce the number of variables. 4. Differentiate implicitly with respect to time. This always involves the chain rule. 5. Substitute the given values and solve for the unknown rate. 6. Check: Did you include units? Yes Does the answer make sense? Yes. x decreasing, y increasing; so dx/dt <0 and dy/dt >0 If there were angles involved, did you use radians? N angles 12 y 12 y s x 12 x y A winch at the top of a 12 m building pulls a 12 m pipe to a vertical position. The winch pulls in the rope at a rate of 0.2 m/sec. Find the rate of vertical change and the rate of horizontal change at the end of the pipe when y = 6. (x,y) bottom right triangle: top left triangle: 1. Identify: a "given" rate, a "to find" rate, other variables. 2. Determine the relationship (equation) between the 'given' and the 'to find'. Use a diagram, if possible, or known formula. solve bottom right for x 2 and substitute in top left to get just 2 variables: simplify: 3. If possible, use the given information to reduce the number of variables. 4. Differentiate implicitly with respect to time. This always involves the chain rule. need s: (from above) 5. Substitute the given values and solve for the unknown rate. s=12 Still need dx/dt From equation for bottom right triangle: Still need x Use bottom right equation above to get x = Check: Did you include units? Yes Does the answer make sense? Yes. x decreasing, y increasing; so dx/dt <0 and dy/dt >0 If there were angles involved, did you use radians? No angles G. Battaly
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13 16. G: radius of sphere increases 3 in/min r r F: rate of change of V when r =9 in, r =36 in 16. G: radius of sphere increases 3 in/min r r F: rate of change of V when r =9 in, r =36 in G. Battaly
14 r r G: dr/dt is constant F: Is da/dt constant? Why? r r G: dr/dt is constant F: Is da/dt constant? Why? Therefore, da/dt is NOT constant. It varies directly as r varies. G. Battaly
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16 Use Implicit Differentiation y = 2x + x 3 z Differentiate with respect to: t x z y Use Implicit Differentiation y = 2x + x 3 z Differentiate with respect to: t x z y G. Battaly
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