The sun is much closer to earth than are the nearest stars, yet it is not possible to measure accurately the diurnal parallax of the sun relative to the stars by measuring its position relative to background objects in the sky directly. explain why.

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Compare the patterns of the two waves shown in the image. which statement is true about these waves?

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.