IT

Please dont reject, adv. phy.

QUESTION 1 When vou are swimming at the bottom of a pool, the water above and around you exerts force on your eardrum. Calculate the force (in N) exerted on your eardrum when you are at the bottom of a pool that is 5.0 m deep. Assume that the area of your eardrum is 1 cm^2 and the density of water is 1000 kg/m^3 (10,000 cm^2 = 1m^2) (Ans: 5N) To solve this, which of the following equation/s should you use (check as many that best applies) Ορ-m/V W = dv O Q = mcAT O Q= mL 1 P2 + pgh, + Pi+pghi+ 늑pv? dQ AS= S Δ $EdA =- PEDA = Lenc €0 O Fb =P fluidgV submerged P= pgh F=ma

Question A6 Potassium has a radioactive isotope, K-40, with a half-life of 1.25 billion years, and a natural abun- dance of 0.012% (120 parts per million). Sea-water contains about 380 ppm of potassium (0.38 grams per litre), essential for life. Calculate the radioactivity of sea-water due to the potassium, giving your answer in Bq m 1. 15 markal

She of fouce constant a ulire is (K) and that of anothese coire ef the mateual pame es (QK). tOhen both the uoiree ace etetched then uoook clone is - (6) Wg = WOz cO Wq=210, (d) Wz-2W? %3D

ASAP

What is the Sl equivalent of 4 Ci? a. 150,000,000,000 or 1.48 X 10(12) Bq Ob. 0.04 Bq c. 0.001032 C/kg Od. 148,000,000,000 or 1.48 X 10(11) Bq

A radio active 8ample consist of two dis tinct Gacademy LIVE species having equel no.of atoma mitielly. Mean Life haing f one is t s other ės . b other is o. 5t. Totel no .of radioac fre nucli at t= 5tis ☺ No( estl es ☺ No r e4tl No et es es Noe-3

KE = mv², KE = Iw², Ug = mgh, U₁ = ¹kx², E = KE + Ug + Us, E₁ = Ef L = mrv, 1 =1w

1. The half-life of a radioactive substance is the time it takes for half of the substance to decay. The radioactive iodine isotope I-131, which has a half-life of 8 days, is used to treat hyperthyroidism. Solve 400 - 3.125 to find how many days t it will take for 400 millicuries of I-131 to decay to 3.125 millicuries. A 56 days в 7days C 8 days D 128 days 2. In the year 2000, the population of Mexico was about 100 million, and was growing by approximately 1.53% per year. At this growth rate, the function Ax) = 100(1.0153)* gives the population, in millions, x years after 2000. Using this model and a graph of the function, in what year would the population reach 109 million? Round your answer to the nearest year. 2006 C 2005 D 2007 A в 2008 3. Use a graph to solve 3* - 100. A x-4.2 в х-2.1 C x- 0.2 D x-0.1