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Suppose a terrorist explodes a ''dirty'' explosive device, a bomb to which is attached radioactive materials, inside a building. lf the 'dirty' material is 2.0 kg block of Strontium -90 (9038 Sr, atomic mass 89.9077, half-life of 28.8 years), the Strontium -90 particles would then be scattered throughout the building in the explosion. If the safe intensity for radioactive levels is less than 10 counts/mm, how long will the building be uninhabitable?
a metallic surface is illuminated with light of wavelength 400 nm if the work function for this metal is 2.487 eV what the velocity of the ejected electrons would be
An object with a charge of -3.26 µC is located at (3.59 m, 4.23 m), and an object with a charge of 1.44 µC is located at (-2.64 m, 0). Find the electric potential (in kV) at the origin
two capacitors c1 27.0 microf and c2 31.0 microf are connected in series and a 18.0-v battery is connected across
a singly charged ion of unknown mass moves in a circle of radius 14.5 cm in a magnetic field of 1.40 t. the ion was
A race car has a mass of 701 kg. It starts from rest and travels 35.0 m in 3.0 s. The car is uniformly accelerated during the entire time. Illustrate what net force is exerted on it?
A string with a mass per length of 2.00 gm/m is stretched with a force of 150 N between two points that are 0.500 m apart. what is the length of the organ pipe
A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the electric field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero?
an ideal air conditioner operating on a carnot cycle absorbes heat q2 from a house at temperature t2 and discahrges q1
Calculate the net work done on the object if it moves 5m up the ramp - calculate the velocity of the blocks after they have moved 2 m.
Under what condition is the cross product of two vectors of afixed magnitude maximum? what is the value of the vertical component of the velocity fora projectile at the top of its trajectory? what is the vector of acceleration foran object moving at ..
q1. a train at rest emits a sound at a frequency of 1045 hz. an observer in a car travels away from the sound source at
A subway train starts from rest at a station and accelerates at a rate of 1.60 m/s^2 for 14.0 s. What is the total distance travelled
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