BIO Predict/Calculate Diopter Change in Diving Cormorants Double-crested cormorants ( Phalacrocorax auritus) are extraordinary birds—they can focus on objects in the air, just like we can, but they can also focus underwater as they pursue their prey. To do so, they have one of the largest accommodation ranges in nature—that is, they can change the focal length of their eyes by amounts that are greater than is possible in other animals. When a cormorant plunges into the ocean to catch a fish, it can change the refractive power of its eyes by about 45 diopters, as compared to only 16 diopters of change possible in the human eye (a) Should this change of 45 diopters be an increase or a decrease? Explain. (b) If the focal length of the cormorant s eyes is 4.2 mm before it enters the water what is the focal length after the refractive power changes by 45 diopters?
BIO Predict/Calculate Diopter Change in Diving Cormorants Double-crested cormorants ( Phalacrocorax auritus) are extraordinary birds—they can focus on objects in the air, just like we can, but they can also focus underwater as they pursue their prey. To do so, they have one of the largest accommodation ranges in nature—that is, they can change the focal length of their eyes by amounts that are greater than is possible in other animals. When a cormorant plunges into the ocean to catch a fish, it can change the refractive power of its eyes by about 45 diopters, as compared to only 16 diopters of change possible in the human eye (a) Should this change of 45 diopters be an increase or a decrease? Explain. (b) If the focal length of the cormorant s eyes is 4.2 mm before it enters the water what is the focal length after the refractive power changes by 45 diopters?
BIO Predict/Calculate Diopter Change in Diving Cormorants Double-crested cormorants (Phalacrocorax auritus) are extraordinary birds—they can focus on objects in the air, just like we can, but they can also focus underwater as they pursue their prey. To do so, they have one of the largest accommodation ranges in nature—that is, they can change the focal length of their eyes by amounts that are greater than is possible in other animals. When a cormorant plunges into the ocean to catch a fish, it can change the refractive power of its eyes by about 45 diopters, as compared to only 16 diopters of change possible in the human eye (a) Should this change of 45 diopters be an increase or a decrease? Explain. (b) If the focal length of the cormorant s eyes is 4.2 mm before it enters the water what is the focal length after the refractive power changes by 45 diopters?
2.2. In an experiment, a shearwater (a seabird) was taken from its
nest, flown 5150 km away, and released. The bird found its way back
to its nest 13.5 days after release. If we place the origin at the nest and
extend the +x-axis to the release point, what was the bird's average ve-
locity in m/s (a) for the return flight and (b) for the whole episode, from
leaving the nest to returning?
Use relevant diagrams where necessary and go through it in details
Your blood pressure (usually given in units of "mm of Hg") is a result of the heart muscle pushing on your blood. The left side of the heart creates a pressure of 115 mm Hg by exerting a force directly on the blood over an effective area of 14.5 cm2. What force does it exert to accomplish this? (Give your answer as the number of Newtons and note that you will need to do some unit conversions.)
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.