BIO A food particle from your breakfast takes a circuitous path through your digestive system . Suppose its motion over a period of time can be represented by the four displacement vectors depicted in Figure 3-49 . Let the vectors have magnitudes A = 8.0 cm, B = 16 cm , C = 23 cm, and D = 5.6 cm. (a) What is the total displacement of the food particle? Give its direction relative to the direction of vector A → . (b) If the average speed of the particle is 0.010 mm/s, what is its average velocity over the time interval of the four displacements? Figure 3-49 Problem 75
BIO A food particle from your breakfast takes a circuitous path through your digestive system . Suppose its motion over a period of time can be represented by the four displacement vectors depicted in Figure 3-49 . Let the vectors have magnitudes A = 8.0 cm, B = 16 cm , C = 23 cm, and D = 5.6 cm. (a) What is the total displacement of the food particle? Give its direction relative to the direction of vector A → . (b) If the average speed of the particle is 0.010 mm/s, what is its average velocity over the time interval of the four displacements? Figure 3-49 Problem 75
BIO A food particle from your breakfast takes a circuitous path through your digestive system. Suppose its motion over a period of time can be represented by the four displacement vectors depicted in Figure 3-49. Let the vectors have magnitudes A = 8.0 cm, B = 16 cm , C = 23 cm, and D = 5.6 cm. (a) What is the total displacement of the food particle? Give its direction relative to the direction of vector
A
→
. (b) If the average speed of the particle is 0.010 mm/s, what is its average velocity over the time interval of the four displacements?
Figure 3-49 Problem 75
Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.
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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