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One of the problems of in-air testing of nuclear weapons (or, even worse, theuseof such weapons!) is the danger of radioactive fallout. One of the most problematic nuclides in such fallout is strontium -90(90 Sir), which breaks down byB -decay with a half-life of 28 years. It is chemically similar to calcium and therefore can be incorporated into bones and teeth, where, due to its rather long half-life, it remains for years as an internal source of radiation.
a) what is the daughter nucleus
b) What percent of the original is left after 56 years?
c) How long would you have to wait for the original level to be reduced to 0.195% of its original value?
A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A2 = 0.0600 m2. Find the volume flow rate Q of the gas
A free electron and a free proton are placed in an identical electric field. which of the following statement are true?
A package is dropped out of a helicopter, which is moving upward at 10m/s at a constant rate. how high above the ground was the package when it was dropped
A 82 kg diver steps off a 12 m tower and drops from rest straight down into the water. If he comes to rest 4.0 m beneath the surface, find out the average resistance force exerted on him by the water.
The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of10.0 cm. What is the angular magnification of the telescope
A proton that has a mass m and is moving at 390 m/s in the + direction undergoes a head-on elastic collision with a stationary oxygen nucleus of mass 16m
A 0.20-kg object is oscillating on a spring with a spring constant of k = 15 N/m. What is the potential energy of the system
The proton is replaced with He2+ ion now at a distance of 3 cm from the bead. What is the magnitude of the force experienced by the helium ion
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.8 m/s2 for 1.58 seconds, at which point its fuel abruptly runs out.
Charge Q = 17E-8 C is placed in the origin. Location A is -3.00m from the charge while location B is 2.00m from the charge. A) Find the potential difference VB - VA between the two points. B) Which point is at the higher potential? Type either "Po..
Suppose 47.5 cm of wire is experiencing a magnetic force of 0.7 N. What is the angle in degrees between the wire and the 1.25 T field if it is carrying a 6.5 A current
A camera uses a biconvex lens made of glass with an index of refraction of 1.60 and has a radius of curvature of 12cm for the 1st surface, What is the focal length of this lens when used in air
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