Two friends are walking by a cliff face when they notice their voices echo. One friend says to the other "It is 50 metres to that cliff. I can find out the speed of sound using this echo!" The first friend claps and listens for the echo. Then they keep clapping exactly in time with the echoes from the cliff. The second friend times how long it takes for the first friend to clap like this thirty times. It takes them nine seconds to clap thirty times in time with the echoes. Using their experiment and their data, calculate the speed of sound in air.
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Chemistry, 22.06.2019 22:30
Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.
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Chemistry, 22.06.2019 23:30
Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.
Answers: 3
Two friends are walking by a cliff face when they notice their voices echo. One friend says to the o...
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