What is the efficiency of a device that takes in 40,000 j of heat and does 12,000 j of work while giving off 28,000 j of heat? use and convert to a percentage. a.70% b. 57% c. 30% d. 43%

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?