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Strontium38Sr90has a half-life of 29.1 yr. It is chemically similar to calcium, enters the body through the food chain, and collects in the bones. Consequently,38Sr90is a particularly serious health hazard. How long (in years) will it take for 99.9817% of the38Sr90released in a nuclear reactor accident to disappear?
The two stars in a binary star system have masses 1.7×10^30 kg and 6.1×10^30 kg. What is the speed of the lightest star
A typical ten-pound car wheel has a moment of inertia of about 0.35 kg(m^2). What is the rotational kinetic energy of the rotating wheel
A 20-kg uniform disk is at rest on a horizontal surface when a horizontal force of F=400N is applied at the center of the disk to the right. Determine the acceleration of the mass center
If Wave B's amplitude is instead -13.4 mm, what is the amplitude of the wave pulse formed while they are interfering
For some applications, it is important that the value of a resistance not change with temperature. What value should the carbon resistor have
Measurements with microelectrodes have shown that a 0.30-nm-diameter potassium ion(K+) channel carries a current of 1.8 pA, How many potassium ions pass through if the ion channel opens for 1.0 ms
A small can is hanging from the ceiling. A rifle is aimed directly at the can, as the figure illustrates. At the instant the gun is fired, the can is released. Ignore air resistance and show that the bullet will always strike the can, regardless of t..
a if your usual weight is 180 lbs and you are in an elevator which is going up and speeding at a rate of 8 fts2 what
How to find out the magnitude of the acceleration
A patient with a dislocated shoulder is put into a traction apparatus, How large should these pulls be
Which of the following must be true if we are to infer (calculate) a star's luminosity directly from the inverse square law for light.
The speed of a projectile when it reaches its maximum height is 0.38 times its speed when it is at half its maximum height
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