Which statement provides the best definition of a closed system o A system in which no net external forces act upon the system
O A system in which no external forces act on the system
o A system in which all acting forces are external to the system
O A system in which the objects exert no force upon each other

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?