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Carbon-14 has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of Carbon-14 is 5730 years. If a sample of charcoal from an archeological dig yields a Carbon-14 activity of 0.15 Bq per gram of carbon, how old is the material?
After falling from rest from a height of 35 m, a 0.45 kg ball rebounds upward, reaching a height of 25 m. If the contact between ball and ground lasted 1.8 ms, illustrate what average force was exerted on the ball?
Calculate the angular velocity? of an electron orbiting a proton in the hydrogen atom, given the radius of the orbit is 0.500x10-10 m . You may assume that the proton is stationary and the centripetal force is supplied by Coulomb attraction.
When we look at a particular star, we are seeing it as it was 103 years ago. How far away from us (in meters) is the star
A particular guitar string is supposed to vibrate at 200Hz, but it is measured to actually vibrate at 209Hz. By what percent should the tension in the string be changed to get frequency to the correct value.
A point on the rim of a 0.55 m diameter grinding wheel changes speed uniformly from 12 m/s to 20 m/s in 8.3 s. What is the average angular acceleration of the wheel
A machine that makes transformers can only wind the coils with a single specific number density. what is length of the output coil
A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in publishing business is a point, defined as 1/72 inch. What is an area..
The Bohr model of an atom assumes that electrons orbit the nucleus, in a manner similar to how planets orbit a sun. What is the orbital period of the electron
Three capacitors all have the same capacitance. When they are wired in series, the equivalent capacitance is 57 ?F. what would the charge on the capacitors be
A ballistic pendulum apparatus has a hinged catcher of mass 250.0 g. What is the muzzle velocity of the gun
q1. charge of uniform density 80 ncm3 is distributed throughout a hollow cylinder region formed by two coaxial
Three resistors with values 1.2 , 2.3 , and 5.0 , respectively, are connected in parallel in a circuit with a 5.0 V battery, what is the pwer delivered to the 5 ohm resistor
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