Which is the correct scientific notation of the number 0.000681? 68.1 × 10-4 6.81 × 104 6.81 × 10-4 6.81 × 10-5 68.1 × 104

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?