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The technique known as potassium-argon dating is used to date old lava flows and thus any fossilized skeletons found in them, like this 1.8-million-year-old hominid skull. The potassium isotope 40^K has a 1.28 billion year half-life and is naturally present at very low levels. 40^K decays by beta emission into the stable isotope 40^Ar. Argon is a gas, and there is no argon in flowing lava because the gas escapes. Once the lava solidifies, any argon produced in the decay of 40^Ar is trapped inside and cannot escape.
What is the age of a piece of solidified lava with a 40^Ar/ 40^K ratio of 0.11?
A monkey shows symptoms of being under the influence of too much physics. Specifically, What is the final angular speed of the monkey's head
Three resistors are connected in series across a battery, What is the greatest voltage that the battery can have without one of the resistors burning up, How much power does the battery deliver to the circuit
A uniform plank of length 4.50 m and weight 275 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 456 N walk on the overhanging part of the plank before it just be..
The flywheel of an engine has a moment of inertia 2.20 {rm kg} cdot {rm m}^{2} about its rotation axis. What is its final kinetic energy.
Establish the speed of transverse waves on a string under a tension of 80.0 N if the string has a length of 2 m and a mass of 5 g. (b) Calculate the power required to create these waves if they have a wavelength of 16 cm and an amplitude of 4 cm.
What minimum coefficient of static friction is required? Is the reply you found reasonable? In other words, is he probable to stay on the merry-go-round.
The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of the cosmos at the rate of 12.9 W. What is HooRU's temperature
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532nm in 3 minutes?
A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? Evaluate the tension in the cable that connects the car to the helicopter?
Sound enters the ear, travels through the auditory canal, and reaches the eardrum. The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in an adult is abou..
A soldier has a huge contraption that notches a large 2 kg arrow (it looks more like a lance) in a massive bow and uses a winch system to draw the arrow back to set the bow. What is the speed of the arrow
Two small frogs simultaneously leap straight up from a lily pad. Frog A leaps with an initial velocity of 0.676 m/s, what is the position and velocity of the other frog
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