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Q7.A system of frictionless and massless pulleys is being used to pull up a load of 2520 N. What is the minimum force (in Newtons) required at the end of the rope (shown in dashed lines)?
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Q9.A virus has two variants P and Q. Two treatments L and M were developed against variant P and Q and tested through four independent trials. Treatment L: 44 successes/50 against P, 81 successes/100 against Q, 125/150 total. Treatment M: 94 successes/100 against P, 31 successes/50 against Q, 125/150 total. Assuming both variants are equally prevalent and both treatments cost about the same, but a given patient can be treated with only one treatment, which of the options is/are true?
CEED2022Q8·nat·Hard
Shown below are three views of the same solid. Count the number of edges.
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