Which of the following is least dense. cork .glass .water .or mercury. hurry pls

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

What are two different ways you could find the value of a? explain these methods.

What is an aquifer for science class