Which of the following is not a major component of soil?
a. mineral matter
b. air
c. humus
d. earthworms

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?