Which substance has the highest density at room temperature?
a. hydrogenc. waterb. oxygend. they are all the same

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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?

How many neutrons does plutonium -196 with an atomic number of 78.