A plane wave has equation: Y=25sin[120t-4x]. Find the: i. wave length ii. wave velocity
iii. frequency and period of the wave
iv. amplitude of the wave
where y and x are in metres, t in seconds

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

Blank liquids and gases exert a buoyant force on objects placed in them

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer