When running a 100 meter race sergio reaches his maximum speed when he is 40 meters from the starting line, and 6 seconds have elapsed since the start of the race. sergio continues at this max speed for the rest of the race and is 85 meters from the starting line 11 seconds after the start of the race. what is sergio's max speed? meters per second suppose sergio runs for an additional 3 seconds after reaching his max how far will sergio travel during those 3 seconds? meters what is sergio's distance from the starting line 9 seconds after the start of the race? meters what is sergio's distance from the starting line 7.5 seconds after the start of the race? meters

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)

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?