B Which of the following will exert the greatest pressure when standing on the ground?
A an elephant: weight 50 000 N, area of one foot 0.2 m2
B atmospheric pressure: 105 Pa
C ballerina: weight 450 N, on one point, area 0.0015 m2
D man: weight 800 N, area of one foot 0.025 m2

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.