Using information about natural laws, explain why some car crashes produce minor injuries and others produce catastrophic injuries.

Which two objects have the greatest gravitational force acting between them

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.