Giải giúp mình với ạ đang cần gấp( giải theo phương pháp lưới hoặc nút)

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?