Select the best dated evidence that humans have been on earth for over four million years from the choices provided. a. a fossil nicknamed lucy was found in east africa. b. a specimen nicknamed ardi was found in east africa. c. artifacts from the stone age were discovered in east africa. d. evidence from the last ice age was found in east africa.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of