On a straight road, a truck moves at constant speed 41.1 km/hr and a car moves at constant speed 138 km/hr. at time t = 0, the car is 6.9 km behind the truck. at what time, in minutes, will the car pull alongside the truck?

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

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.

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