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Today's terrestrial background radiation is about 50 mrem/year, mainly due to the uranium and thorium decay chains, and potassium. The earliest evidence of life on earth was about 3.5 billion years ago. If the approximate current contributions for each decay chain is Th-232: 11 mrem/year, U-238: 26 mrem/year and K-40: 11 mrem/year, what was the average dose rate 3.5 billion years ago? State the source of all values used in your calculation.
A pendulum clock with a brass suspension system m is calibrated so that its period is 1s. at 11*C (degree Celsius). If the temperature increases to 44oC, by how much does period change.
two masses are separated by 3.85m. the mass of objects are 5.98kg and 7.35 kg. how far is the center of mass of the system
An occupant of a car has a chance of surviving a crash if the deceleration all through the crash is not more than 30.00 g. Approximation the force on a 72 kg person decelerating at this rate.
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.7692 N when separated by 50 cm, center-to-center, What were the initial charges on the spheres
An object moves along the x axis according to the equation x = 3.35t2 ? 2.00t + 3.00, At what time is the object at rest
What is the charge on each sphere if the two charges are alike?
A movie camera with a (single) lens of focal length 85 mm takes a picture of a person standing 35 m away. what is the height of the image in millimeters on the film
A liquid compresses 2.0 percent when subjected to a pressure of 34 MPa. What is the bulk modulus of the liquid
The graph shows the component of a force acting on an object, in newtons, versus the position of the object, in meters. Find the work done by the force
A small bag of sand is suspended by a string of length L=1.2m. A bullet of mass m=8g, moving with initial speed vi = 600m/s in the horizontal direction, Determine the mass of the sand bag
what did faraday and henry discover happened when a magnet was moved in a coil of wire? a a magnetic current will be
A 12 volt battery powers a circuit that consists of a ten ohm resistor in series with a ten ohm and a 15 ohm that are in parallel. How much current flows through the 15 ohm resistor
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