Mrs. Mechinus wants to determine which type of ball has the highest bounce. She drops a tennis ball, soccer ball, then a basketball from a height of 15 feet, and measures & records how high each bounces back up. Identify the dependent and independent variables in this experiment. Use supporting details to explain why they are those variables.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?