Aball of mass m, attached to the end of a horizontal cord, is rotated in a circle of radius r on a frictionless horizontal surface. if the cord will break when the tension in it exceeds f, what is the maximum speed the ball can have? express your answer in terms of the given quantities.

Identify the arrows that show the correct direction of heat transfer. 66°f 112°f 98°f

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.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z