Penny placed a tablet of baking soda in a cup of water. The tablet immediately began to bubble, fizz, and eventually dissolve. Did a physical or chemical change occur and how do you know? A chemical; the fizzing sounds indicates a new substance was formed

B physical; the water can be boiled off and the tablet residue would be left

C physical; the tablet only dissolved in the water and formed a mixture

D chemical; the tablet gave off a gas in the form of bubbles

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.

5400 j of energy are given off when a 50 g of aluminum pan changes temperature. does the temperature of the pan increase or decrease and by how much?

Do you think you could give me the answers to #29?