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1. The formula of the ionic compound that forms from two ions, A2+and R5-, can be written as AxRy. What is the value of x?
2. A specific radioactive isotope has a half-life of 39.2 minutes. How long will it take this isotope to decay 1/8 of its original amount?
3. Two short-lived isotopes of an element are produced in a nuclear reaction. One of these isotopes has a mass of 5.3731 amu and accounts for 75.5% of the production. The remaining isotope has a mass of 7.3904 amu. Use this information to calculate the atomic mass of this element.
forces acting on the arm of a person lifting a dumbbell. the force f is the force pulling on the hand due to the weight
Assuming the cost of energy from the electric company is $0.065/kWh. Find the cost per day of operating a lamp that draws a current of 1.45 Amp from a 110 Volt line
a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. What is its angular momentum about that axis
A bullet of mass 8.80 x 10-3 kilogram, moving at 1250 m/s impacts a tree stump and penetrates 4.00 centimeter into the wood before coming to rest. determine how far would it penetrate into the wood
A 0.17 kilogram baseball is launched from the roof of a building 14 meter above the ground. Obtain the speed of the ball as it strikes the ground
A barbell consists of two small balls, each with mass 600 grams (0.6 kg), at the ends of a very low mass rod of length d = 20 cm (0.2 m). The center of the barbell is mounted on the end of a low mass rigid rod of length b = 0.3 m, and this rod rot..
in the arctic polar bears must be able to walk on thin ice to travel and hunt for food. an average male polar bear has
The New England Merchants Bank Building in Boston is 152 m high, What is the total distance, side to side, that the top of the building moves during such an oscillation
A particle of charge q starts at rest and experiences an electric field varying along the x direction as bx where b>0 is some constant. find its kinetic energy
A solenoid used to produce magnetic fields for research purposes is 2.5m long, with an inner radius of 26cm and 1400 turns of wire. how large a current does it carry
A 26 kg gun is standing on a frictionless surface. The gun fires a 55.2 g bullet with a nmuzzle velocity of 320 m/s. Calculate the momentum of the gun immediately after the gun wasfired
When yellow light from a sodium lamp shines on a certain photocell, What potential would be needed to stop the electrons if light with 4000 A is used
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