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Suppose you were given Php 1,000,000,000. How long would it take to have less than five pesos left if you spent half of it every day?
Natural potassium contains K-40, which has a half-life of 1.277 x 109 years.
a. What mass of K-40 in a person would have a decay rate of 4140 Bq?
b. What is the fraction of K-40 in natural potassium, given that the person has 140 g in his body? (These numbers are typical for a 70-kg adult.)
Radioactive iodine is used to diagnose and treat diseases of the thyroid gland. The half-life of iodine-125 is 60 days. The half-life of iodine-131 is 8 days. Keeping in mind that overexposure to radiation is harmful, which of these isotopes would be the best to use? Explain your answer.
Describe an experiment to find how the volume of gold can be measured
The mass in grams of 2.8 moles aluminium.is.........(al=13)
write in 120 words the relationship between the third law of thermodynamics and the theory of the big bang
A compressive force of 15-N is applied to a flexible poly(vinyl chloride) (CAS# 9002-86-2) wire that is 5-m long and has a diameter of 3.6-mm. If the wire contracts by 0.5-mm, calculate the compressive modulus (K).
There are a variety of models that can be used to describe viscoelastic behaviors. In which of the following models will the elastic response be hindered by viscous resistance: a) the Maxwell model or b) the Voigt model? Explain your answer in your own words.
Which of the following would be most soluble in a hexane solvent: (i) PS, (ii) PTFE, or (iii) PVC? Explain and support your answer in your own words.
Calculate the tensile modulus (G) of a 1-cm poly(methyl methacrylate) (CAS# 9011-14-7) rod with a tensile stress of 69.1 MPa and an elongation of 2.6%.
