James and John Dive from an Overhang into the Lake

question 137

Multiple Choice

James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s.
Compare the time it takes each to reach the lake below if there is no air resistance.

• A) Cannot be determined without knowing the mass of both James and John.
• B) James and John will reach the surface of the lake at the same time.
• C) John reaches the surface of the lake first.
• D) Cannot be determined without knowing the weight of both James and John.
• E) James reaches the surface of the lake first.

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Definitions:

Depth of Field

The range within a photo that appears acceptably sharp, influenced by aperture, focal length, and distance from the subject.

Magnification

The process of enlarging the appearance of an object using optical instruments like lenses or microscopes.

Adjustment Knobs

Controls on a microscope used to focus the image by moving the stage or the optics closer to or farther from the specimen.

Objective Lens

The lens in a microscope closest to the specimen, which collects light and focuses the image into the eyepiece.