What frequency of sound has a wavelength of 75cm?

Stion 13 of 20 : select the best answer for the question. 13. if a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°c, what will be the volume at 50°c? a. 0.002021624 m3 b. 0.004021624 m3 c. 0.000010812 m3 d. 0.002010812 m3

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

As the distance from a magnet increases, what happens to the magnet force?