In early test flights for a space shuttle using a "glider" (mass of 1000kg including pilot), it was noted that after a horizontal launch at 500 km/h at a height of 3500m, the glider eventually landed at a speed of 200 km/h. a) What would its landing speed have been in the absence of air resistance?b) What was the average force of air resistance exerted on it if it came in at a constant glide of 10 degrees to the Earth?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

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.

The energy equivalent of the rest mass of an electron is