Nitrogen-16 (N16) production is the major source of radioactivity during nuclear reactor power operations. However, N16has a relatively low half-life of 7.13 s. Suppose that at reactor shutdown, the radiation levels due to N16in thereactor compartment are measured to be 40 roentgen/hr (r/hr). In order to perform a reactor compartment inspection, radiation levels must be negligible (<1 mr/hr). Note: 1000 mr=1 r.(a) Determinekand write the differential equation describing this process of radioactive decay.(b) Solve the differential equation to get a formula for the radiation level at any time.(c) How long must the technicians wait until they can enter the reactor compartment for the inspection?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

In a sample of 2023 u.s. adults, 373 said franklin roosevelt was the best president since world war ii. two u.s. adults are selected at random from the population of all u.s. adults without replacement. assuming the sample is representative of all u.s. adults, complete parts (a) through (d). (a) find the probability that both adults say franklin roosevelt was the best president since world war ii. the probability that both adults say franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (b) find the probability that neither adult says franklin roosevelt was the best president since world war ii. the probability that neither adult says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (c) find the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii. the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (d) which of the events can be considered unusual? explain. select all that apply. the event in part left parenthesis a right parenthesis is unusual because its probability is less than or equal to 0.05. the event in part (b) is unusual because its probability is less than or equal to 0.05. none of these events are unusual. the event in part (c) is unusual because its probability is less than or equal to 0.05.

Is the power produced directly proportional to the wind speed, give reasons for your answer?