A wave traveling at 200 m/sec has a wavelength of 2.5 meters. What is the frequency of this wave

Four objects are being tested to see how they are affected by fluid friction. object w has a surface area of 4.5 cm2, object x has a surface area of 2.5 cm2, object y has a surface area of 6.2 cm2, and object z has a surface area of 3 cm2. which object would experience the most fluid friction?

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.