You are a member of a group designing an air filtration system for allergy suffers. to optimize its operation you need to measure the mass of the common pollen in the air where the filter will be used. to measure the pollen's mass, you have designed a small rectangular box with a hole in one side to allow the pollen to enter. once inside the pollen is given a positive electric charge and accelerated by an electrostatic force to a speed of 1.4 m/s. the pollen then hits the end of a very small, uniform bar which is hanging straight down from a pivot at its top. since the bar has a negative charge at its tip, the pollen sticks to it as the bar swings up. measuring the angle that the bar swings up would give the particle's mass. after the angle is m charge of the bar is revers easured, the ed, releasing that particle. it's a cool design but your friend insists it will never work. to prove it she asks you to calculate the length of the bar which would give you a reasonabl of about 10 for a typical pollen particle of 4 x 10 grams. your plan calls for a bar of 7 x 10 grams. is she right?

American eels (anguilla rostrata) are freshwater fish with long, slender bodies that we can treat as uniform cylinders 1.0 m long and 10 cm in diameter. an eel compensates for its small jaw and teeth by holding onto prey with its mouth and then rapidly spinning its body around its long axis to tear off a piece of flesh. eels have been recorded to spin at up to 14 revolutions per second when feeding in this way. although this feeding method is costly in terms of energy, it allows the eel to feed on larger prey than it otherwise could. 1.a field researcher uses the slow-motion feature on her phones camera to shoot a video of an eel spinning at its maximum rate. the camera records at 120 frames per second. through what angle does the eel rotate from one frame to the next? 2. the eel is observed to spin at 14 spins per second clockwise, and 10 seconds later it is observed to spin at 8 spins per second counterclockwise. what is the magnitude of the eels average angular acceleration during this time? 3. the eel has a certain amount of rotational kinetic energy when spinning at 14 spins per second. if it swam in a straight line instead, about how fast would the eel have to swim to have the same amount of kinetic energy as when it is spinning? 4.a new species of eel is found to have the same mass but one-quarter the length and twice the diameter of the american eel. how does its moment of inertia for spinning around its long axis compare to that of the american eel?

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter