How does the law of conservation of energy apply to machines?

-machines create energy from scratch.
-machines consume energy until no energy remains.
-energy transferred to a machine equals energy transferred from it.
-engineers break the law of conservation of energy by using machines.

Yardım edin lütfen uzun cevap lazım çok puan veriyorum

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate