"175 years" is a measurement of a quantity ? A: scalar
B: vector
C: could be either of these
D: neither of these

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

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Positive ions differ from neutral atoms in that