Suppose you have a container filled with iron and sand. you can separate the iron from the sand if you so this is a
a) use a magnet; mixture.
b) melt the sand; mixture.
c) add baking soda; chemical compound.
d) dissolve the sand in water; solution.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

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