A bicyclist biking along at 9.6 m/s sees a car in front of him and hits the brakes. The
bike skids to a halt over a distance of 1.8 meters. If the combined mass of the
bicyclist and his bicycle are 86-kg, what was the magnitude of the force of friction that
brought the bike to a stop over this distance?

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.