Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track. sector size is 1 kb. the average seek time is 8 ms, the track-to-track access time is 1.5 ms, and the drive rotates at 3600 rpm. successive tracks in a cylinder can be read without head movement. what is the disk capacity? what is the average access time? assume this file is stored in successive sectors and tracks of successive cylinders, starting at sector 0, track 0, of cylinder i. estimate the time required to transfer a 5-mb file. what is the burst transfer rate?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?