An electromagnet used in a junkyard can only pick up small cars. How could the electromagnet be improved so that it can lift trucks and other large vehicles?

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

Most short-period comets do not have randomly oriented orbits because

What component of earth’s atmosphere exists entirely as a result of photosynthesis?