College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- After passing a visual inspection, what mechanical test is next used on the 2G or 6G pipe test specimen?arrow_forwardThe Half-life of Pennies Lab Can you use pennies to demonstrate "decay? Imagine existing more than 5,000 years and still having more than 5,000 to go! That is exactly what the unstable element carbon-14 does. Carbon-14 is a special unstable element used in the absolute dating of material that was once alive, such as fossil bones. Every 5,730 years, half of the carbon-14 in a fossil specimen decays or breaks down into a more stable element. In the following lab you will see how pennies can show the same kind of "decay." Materials • 100 pennies • large container with a cover Procedure a. Place 100 pennies in a large, covered container. Shake the container several times and remove the cover. Carefully empty the container on a flat surface, making sure the pennies don't roll away. b. Remove all the coins that have the "head" side of the coin turned upward. Record the number of pennies removed and the number of pennies remaining in the data table below. Shake number Number of coins removed…arrow_forwardhow do you solve the equations to get Fab / Fac= 2.1N , and Fad = 7.02?arrow_forward
- This table has results from a flu screening test to determine if a person has influenza virus. This information is used to determine how well the screening test works. Flu Diagnosis Flu Diagnosis Total Present Not Present Screening Test (+) Positive 731 270 1001 Screening Test (-) Negative 78 1500 1578 Total 809 1770 2579 Calculate specificity (Sp). Please write in your answer (Hint: remember to multiply by 100 to get the 11.55pm Submit Ouizarrow_forwardAn extra-strength aspirin contains0.500 gof aspirin. How many grains is this? (1grain=64.8mg) 7.72 grains 3.24×10^4 grains 32.4 grains 7.72×10^−5grainsarrow_forwardJanice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…arrow_forward
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