It's possible for a determined group of people to pull an aircraft. drag is negligible at low speeds, and the only force impeding motion is the rolling friction of the rubber tires on the concrete runway. in 2000, a team of 60 british police officers set a world record by pulling a boeing 747, with a mass of 200,000 kg, a distance of 100 m in 53 s. the plane started at rest. suppose that the rolling friction coefficient = 0.02.
estimate the force with which each officer pulled on the plane, assuming constant pulling force and constant acceleration.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

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.

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