An aluminum cube with side 20 cm floats on mercury. How much will the aluminum block sink when the temperature is increased from 270 K elvin to 320 Kelvin (the coefficient of mass expansion for mercury is 1.8.10^-4/Celcius)?

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency