Which of the following elements is a liquid at room temperature? A. Calcium B. Mercury C. Boron D. Phosphorous

The necleus of an atom is made up of what subatomic particles?

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?

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?