Its would be a radio. because it is the only electrical one out of the choices
Answer:
vB = 12 m/s
W = 36 J
Explanation:
Potential energy converts to kinetic energy
½mv² = mgh
v = √(2gh)
vB = √(2(9.8)(7.1 - 0) = 11.796609... m/s
W = mg(hA) - mg(hB) = 0.8(9.8)(7.1 - 2.5) = 36.064 J
Ans: Principle of the lever HTML5
The lever is a simple machine that changes the magnitude and direction of the force applied to move an object. It minimizes the effort required to lift the object. A lever is a rigid bar which moves around a supporting point (pivot or fulcrum). The object to be lifted is placed on the bar.
