An older fire alarm has a wax block keeping the circuit open. When the heat from a fire melts the block, the circuit is closed, which activates the alarm's bell and flashing light. Which of these energy conversions is
correct?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.