All questions need to have both qualitative and quantitative models included for credit. Your friend Anna who is a MHS basketball player and Arcadia University women's basketball commit, has a vertical that is just over 0.5 meters.
(a) Estimate the force that she exerts on the surface of the basketball court as she jumps if she pushes off the ground for 0.3 seconds. State all your assumptions explicitly.
(b) Compare this force with uhh the force that the surface exerts on Anna. Describe all the assumptions used in your estimate and state how each assumption affects the result.
(c) Repeat the problem looking at the time interval when she is landing back on the floor.

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)