What causes dust particles to move with brownian motion?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

More solar radiation is absorbed by earth’s surface than by