What are the two most important processes in the cycling of oxygen in and out of the atmosphere?
a. weathering and erosion
b. evaporation and precipitation
c. photosynthesis and respiration
d. lightning fixation and fossil fuel emission

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?