Suppose scientists believe that they've discovered a new planet. which of the following must be true for the object they've found to qualify as a planet?

Why are graphs useful when interpreting data

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?

Which of these metals are magnetic?