Will is 80 kg and is falling while attached to a bungee cord. When the bungee cord is stretched it behaves like a spring would with constant k = 120 N/m. If Will has a velocity of 20 m/s (down) when the
bungee cord just begins to stretch, what maximum stretch will the cord undergo, assuming that air
resistance does - 1000 J of work on him on his way down to the lowest point? (4 marks)

What are similarities and differences between refraction, reflection, diffraction and absorption?

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.

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above