An athlete, swimming at a constant speed, covers a distance of 221 m in a time period of 3 minutes and 38 seconds. The drag force exerted by the water on the swimmer is 71.0 N. What is the power the swimmer must provide to overcome that drag force. (in W)

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

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.