If the second harmonic of a certain string is 42 hz, what is the fundamental frequency of the string?

21 hz
42 hz
84 hz
126 hz

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

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

In the first law of thermodynamics, triangle e=q-w, what does q stand for