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Two radioactive nuclei A and B are present in equal numbers to begin with. Three days later, there are 2.99 times as many A nuclei as there are B nuclei. The half-life of species B is 2.11 days discover the half-life of species A (in days).
A 2.90 kg lump of aluminum isheated to 92.0°C and then dropped into 7.30 kg of water at 5.00°C. what is the system's final(equilibrium) temperature
You roughly estimate that the roommate shines light rays on to the water at an angle of 52.1°. You know that air has an index of refraction of 1.0. Determine the index of refraction of the unknown liquid
The kinetic energy of a proton is 80% of its total energy. What is the momentum in kg·m/s of the proton?
A 3.4-m-tall, 90-cm-diameter concrete column supports a 4.0×10^5kg load. By how much is the column compressed
An isotope of the element Thallium, Tl-206, undergoes beta decay with a half life of 3.1 minutes. what mass of the isotope will be left after 9.3 minutes have elapsed
Calculate the Work required (in eV) to move a stationary electron from the location r3 to r5 in a hydrogen atom
The semiconducting compound InAs is widely used for infrared light emitting diodes (LED's). What is the frequency of light emitted by a InAs LED
A 5.0-kg mass by an initial velocity of 4.0 m/s, east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s, west. After the collision the 5.0-kg mass has a velocity of 1.2 m/s, south. What is the magnitude of the velocity of the 4.0-kg mas..
A shower head has 20 circular openings, each with radius 0.80mm. The shower head is connected to a pipe with radius 1.0cm. what is its speed as it exits the shower-head openings
a 0.40-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 3.0 n for a distance
A block of mass 3.0 kg slides toward the right on a frictionless surface with v0 = 7.5 m/s. What is the position xf where the block stops
A bullet is fired into a block of wood sitting on a block if ice. The bullet has an initail velocity of 500m/s and a mass of 0.005 kg. The wooden block has a mass of 2kg and is initially at rest.
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