Which of the following statements is true?
a)organic compounds contain only carbon and hydrogen.
b)about 10 percent of all known compounds are organic compounds.
c)organic compounds always contain carbon and hydrogen.
d)organic compounds are produced only in organisms.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?