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A machine has an efficiency of 70%. What happens to the other 30% of the work?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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.

In a good thermo flask the main cause of heat loss is