When you drop a 0.42 kg apple, earth exerts a force on it that accelerates it at 9.8 m/s 2 toward the earth’s surface. according to newton’s third law, the apple must exert an equal but opposite force on earth. if the mass of the earth 5.98 × 1024 kg, what is the magnitude of the earth’s acceleration toward the apple? answer in units of m/s 2 .

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.