A Spacecraft Is Measured by a Scientist on the Ground $81 \mathrm {~m}$

question 79

Short Answer

A spacecraft is measured by a scientist on the ground to have a length of $81 \mathrm {~m}$ as it flies overhead with a speed $2.4 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s }$ . The spacecraft then lands and its length is again measured by the scientist at rest on the ground. What result does he now get for the Iength of the spacecraft? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

---

Definitions:

Cones

Photoreceptor cells in the retina of the eye responsible for color vision and visual clarity in well-lit conditions.

Ocular Dominance Columns

Ocular dominance columns are stripes of neurons in the visual cortex of the brain that respond preferentially to input from one eye or the other, playing a role in the development of depth perception.

Cones

Cone cells are a type of photoreceptor in the retina that are responsible for color vision and are most effective in relatively bright light.

Visible Wavelengths

The portion of the electromagnetic spectrum that is visible to the human eye, ranging approximately from 380 to 740 nanometers.