John wants to lift a refrigerator into the back of a U-Haul truck that is 2
meters high. The refrigerator has a weight of 2000 N. John uses a pulley
which requires him to use 40 N of force. Danielle uses a ramp that requires
her to use 10 N of force. Find the Mechanical Advantage for each
person/machine.

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.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?