a mass of 20 g of ice at 75 degrees Celsius is taken from a freezer and placed in a beaker containing 200 gram of water at 26 degrees Celsius calculate the amount of thermal energy needed to convert all at 15 degree Celcius to water at 0 degree Celsius

Which object is most likely represented by a dot?

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?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.