Avery long stick ruled with meter markings is placed in empty space. a spaceship of rest length l = 100 m runs lengthwise alongside the stick. two space travelers equipped with knives and synchronized watches station themselves fore and aft. at a prearranged time, each reaches through a porthole and slices through the stick. if the relative velocity of the stick and ship is v = (4/5)c, how many meter marks are on the cut-off portion of the stick? do the calculation first in the frame of the ship, and then do the calculation over in the frame of the stick. in each case, draw careful pictures.

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity