Linda threw two stones, one in a horizontal direction and another one straight up. she observed that both stones fell back to the ground. based on her observations, the best explanation would be that gravity is a force that a) pushes up towards the sky. b) pulls down towards the earth. c) pushes objects in two directions. d) acts in the direction any objects moves.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]