Cyclist A starts off from an origin with a rectilinear trajectory and at speed of 72 km/h. At the
same time, another cyclist B, placed 30 km in front of A, starts off in the opposite direction at a
speed of 36 km/h. When and where they find each other?

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is

Which of these conditions most likely produces an unstable isotope?

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