The layer of soil that contains the most organic material is called the . a. a b. b c. c d. d

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

Heterogeneous mixture with larger particles that never settle is

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?