An aluminum screw has a density of 2.7 g/ml and a volume of 15ml. what is the mass of the screw ?

In a closed system, the total energy prior to an energy transformation is the total energy after. a. equal to b. unrelated to c. greater than d. less than

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?