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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. Please show all work.
When a potential difference of 140 V is applied to the plates of a parallel-plate capacitor, plates carry a surface charge density of 27 nC/cm2. What is the spacing between the plates.
A negative charge (-q) with a mass of 0.29 kg is dangling vertically on a string. Directly below this charge, is a charge with same amount of charge, but with the opposite sign (+q). When it is located 22.74 cm below the charge on the string, the ..
An ideal, monatomic gas is allowed to expand quasi-statically and adiabatically from an initial volume Vi = 3.0 liter and initial temperature Ti = 360 K to a final volume of Vf = 8.2 liter. What is the change in the internal energy of the gas
An arrow is fired from a castle tower at an angle of 40 degrees above horizontal, and with a speed of 62 m/s. What is the speed of the arrow as it hits the ork
One of Isaac Newton's insights was that the earth's gravity extended well beyond its surface even as far as the moon, How did he know that there was any force at all acting on the moon
A child and sled with a combined mass of 57.0 kg slide down a frictionless slope. what is the height of the hill
A resistor of 370 is connected in series with a capacitor of 52.0 µF capacitance. The phase shift between the current and voltage at f = 10.3 Hz is
Assuming a coefficient of friction of 0.45 between the disk and the surface it slides on, how far will it travel (after leaving the spring) before coming to a stop
A sealed tank containing seawater to the height of 11.10 m also contains air above the water at a gauge pressure of 3.20 atm. Water flows out from the bottom throughout a small hole.
A 1026 kg car and a 2210 kg pickup truck approach a curve on the expressway that has a raduis of 264 m. find the normal force on the truck to the highway surface
A pendulum oscillating on the moon has the same period as a(n) 3.14 m pendulum oscillating on Earth. find the length of the pendulum on the moon
A sledge loaded with bricks has a total mass of 17.0 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. How much work is done by the rope on the sledge
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