At the local radio controlled (RC) airfield, a 2.4 kg RC plane strikes a 1.3 kg aerial drone that is hovering stationary at an altitude of 10.2 m. Just after the collision, the two aircraft are stuck together and moving to the east at 8.5 m/s at an altitude of 10.2 m. What is the speed (in m/s) of the plane just prior to the collision?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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.

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?