You attach a cart with a mass of 1500 g to a spring and compress the cart- spring system so that the cart is located 40 cm behind the spring's equilibrium
position. The spring constant for the spring is 65 N/m. When the spring is
released, what is the cart's velocity as it passes the equilibrium position?

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

What does the law of conservation of mass state?