The radioactive isotope technetium-99 in an excited state ( 9943tcm or tc-99m) can be used in medicine to determine a patient's blood volume. tc-99m emits gamma-rays and has a half-life t1/2 = 6.0h. a sample of tc-99m of mass 7.7x10-14kg is injected into the patient's circulatory system. 1.0 h after the injection, 20 cm³ of blood is taken from the patient. the activity of this sample is measured to be 55 kbq. calculate the patient's blood volume. show with explanations.

A3030 cmcm wrench is used to loosen a bolt with a force applied 0.30.3 mm from the bolt. it takes 6060 nn to loosen the bolt when the force is applied perpendicular to the wrench. how much force would it take if the force was applied at a 3030 degree angle from perpendicular? a 3030 cmcm wrench is used to loosen a bolt with a force applied 0.30.3 mm from the bolt. it takes 6060 nn to loosen the bolt when the force is applied perpendicular to the wrench. how much force would it take if the force was applied at a 3030 degree angle from perpendicular?