If two air masses with different temperatures or humidity levels meet, they do not immediately mix or blend. Instead, a line or boundary forms between them. This boundary is called a .

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Convection currents are caused by differences in what two things?

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.