Afan is designed to last for a certain time before it will have to be replaced (planned obsolescence). the fan only has one speed (at a maximum of 725 rpm), and it reaches the speed in 4.0 s (starting from rest). it takes the fan 9.0 s for the blade to stop once it is turned off. the manufacturer specifies that the fan will operate up to 1 billion rotations. andre lives in a hot climate, works outside of the home from approximately 8: 00 am to 5: 00 pm, monday through friday, does not own an air conditioner, and can't sleep with the fan running. estimate how many hot days andre will be able to use the fan, rounded to the nearest day.

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

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)

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer