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A radiation worker is subject to a dose of 100 mrad/h of protons for one 40 h work week. How many times the yearly allowable effective dose did she receive?
HINT: To obtain the effective dose, multiply the dose rate by the time in hours and the quality factor . You then have to divide this by the allowed dose for a radiation worker per year.
o particles with charges +9e and -9e are initially very far apart (effectively an infinite distance apart). which is the change in the electric potential energy
A child and sled with a combined mass of 50.6 kg slide down a frictionless hill that is 8.72 m high. If the sled starts from rest, what is its speed at the bottom of the hill
An electric vehicle starts from rest and accelerates at a rate of 1.7 m/s2 in a straight line until it reaches a speed of 27 m/s. The vehicle then slows at a constant rate of 1.0 m/s2 until it stops. (a) How much time elapses from start to stop? (..
suppose a trucks mass is 2000 kg while the cars mass is 1000kg. and suppose the truck slows down by 5 ms during the
Young's modulus of nylon is 3.7 × 109 N/m2. A force of 6.0 × 105 N is applied to a 1.5-m length of nylon of cross sectional area 0.25 m squared
The astronomical object 4U0142+61 has the distinction ofcreating the most powerful magnetic field ever observed. This object is referred to as a "magnetar" (a subclass of pulsars), andits magnetic field is 1.30E+15 times greater than the Earth'sma..
a lead bullet weighing 0.0200 lbf and traveling horizontally at 3000. fts is suddenly stopped by a perfectly rigid
A salesperson claims a 1340 kg car has an average acceleration of 3 m/s2 from a standing start to 100 km/h. What average net force is required to do this
A rectangular wooden block measures 10.0 4.00 2.00 . When the block is placed in water, it floats horizontally, What is the density of the wood
Radioactice substances decay exponentially. The amount of radium present at an time t obeys the law Q(t)= Qoe^-kt, where Qo. is the initial amount present and k is a suitable positive constant. What is the amount left after 800 years?
A baseball is hit with a speed of 33.0 ms-1 at an angle of 56.0 degrees. It land's on the flat roof of a nearby building with a height of 13 m. If the ball was hit when it was 1.7 m above the ground, what horizontal distance does it travel before it ..
What is the tension in (a) the nearer (relative to the person) cable and (b) the farther (relative to the person) cable.
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