Predict/Calculate The Longitude Problem In 1759, John Harrison (1693-1776) completed his fourth precision chronometer, the H4 which eventually won the celebrated Longitude Prize. (For the human drama behind the Longitude Prize, see Longitude , by Dava Sobel.)When the minute hand of the H4 indicates 10 minutes past the hour, it extends 3.0 cm in the horizontal direction. (a) How long is the H4’s minute hand? (b) At 10 minutes past the hour, is the extension of the minute hand in the vertical direction more than less than, or equal to 3.0 cm? Explain. (c) Calculate the vertical extension of the minute hand at 10 minutes past the hour. Not just a watch! The Harrison H4. (Problem 79)
Predict/Calculate The Longitude Problem In 1759, John Harrison (1693-1776) completed his fourth precision chronometer, the H4 which eventually won the celebrated Longitude Prize. (For the human drama behind the Longitude Prize, see Longitude , by Dava Sobel.)When the minute hand of the H4 indicates 10 minutes past the hour, it extends 3.0 cm in the horizontal direction. (a) How long is the H4’s minute hand? (b) At 10 minutes past the hour, is the extension of the minute hand in the vertical direction more than less than, or equal to 3.0 cm? Explain. (c) Calculate the vertical extension of the minute hand at 10 minutes past the hour. Not just a watch! The Harrison H4. (Problem 79)
Predict/Calculate The Longitude Problem In 1759, John Harrison (1693-1776) completed his fourth precision chronometer, the H4 which eventually won the celebrated Longitude Prize. (For the human drama behind the Longitude Prize, see Longitude, by Dava Sobel.)When the minute hand of the H4 indicates 10 minutes past the hour, it extends 3.0 cm in the horizontal direction. (a) How long is the H4’s minute hand? (b) At 10 minutes past the hour, is the extension of the minute hand in the vertical direction more than less than, or equal to 3.0 cm? Explain. (c) Calculate the vertical extension of the minute hand at 10 minutes past the hour.
Helicobacter pylori (H. pylori) is a helically-shaped bacterium that is usually found in the stomach. It burrows through the gastric mucous
lining to establish an infection in the stomach's epithelial cells (see photo). Approximately 90% of the people infected with H. pylori will
never experience symptoms. Others may develop peptic ulcers and show symptoms of chronic gastritis. The method of motility of H.
pylori is a prokaryotic flagellum attached to the back of the bacterium that rigidly rotates like a propeller on a ship. The flagellum is
composed of proteins and is approximately 40.0 nm in diameter and can reach rotation speeds as high as 1.50 x 103 rpm. If the speed
of the bacterium is 10.0 μm/s, how far has it moved in the time it takes the flagellum to rotate through an angular displacement of 5.00
* 10² rad?
Zina Deretsky, National Science
Foundation/Flickr
H. PYLORI CROSSING MUCUS LAYER OF STOMACH
H.pylori Gastric Epithelial
mucin cells
gel
Number
i
318
Units
um
H.pylori…
T1. Calculate what is the received frequency when the car drives away from the radar antenna at a speed v of a) 1 m/s ( = 3.6 km/h), b) 10 m/s ( = 36 km/h), c) 30 m /s ( = 108 km/h) . The radar transmission frequency f is 24.125 GHz = 24.125*10^9 Hz, about 24 GHz. Speed of light 2.998 *10^8 m/s.
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