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A reading on a Geiger counter of 0.23 mrad/h is based on assuming that the measured radiation is due to cesium-137, which sends out gamma radiation of 0.662 MeV, and that the mass of the person with the Geiger counter is 76 kg. How many ?-rays does the person's body absorb every second?
A sphere consists of a solid wooden ball of uniform density 800 and radius 0.20 and is covered with a thin coating of lead foil with area density 20.
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional enhancement in length is to be the similar as that of the spider's thread.
A straight ladder is leaning against the wall of a house. The ladder has rails 3.20 m long, joined by rungs 0.530 m long. What should be the thickness of the rock
A playground merry go round of a diameter 6m and mass 240 kg is rotating at 12 rev/min about a frctionless vertical axle. Facing the axle, a 30kg child hops on to the merry go round and manages to sit down on its ledge. What is the new angular spe..
An initially motionless test car is accelerated uniformly to 145km/h in 8.28s before striking a simulated deer. The car is in contact with the faux fawn for .815s, after which the car is measured to be traveling at 82.0km/h. What is the magnitude ..
What are vertical and horizontal components of the ball's momentum immediately after striking the crossbar. what is an average acceleration of the ball during this time interval.
A helicopter is ascending vertically with a speed of 5.57. At a height of 124 above the Earth, package is dropped from a window. How much time does it take for the package to reach the ground?
The water comes out of the heads at an angle of 35o to the horizontal and covers a radius of 7.0 m. What is the velocity of the water coming out of each sprinkler head
A wire coil is oriented so that its plane is perpendicular to a magnetic field of 0.58 T initially pointing to the left. What is the average induced emf, if the diameter of the coil is 49 cm
charge of -2.95 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.097 m. The charges on the circle are -3.85 µC at the position due north and +5.20 µC at the position due ea..
A force Farrowbold applied to an object of mass m1 produces an acceleration of 3.10 m/s2, What is the value of the ratio m1/m2
A 4.8mH toroidal inductor has 140 identical equally spaced coils. If it carries an 11.5 A current, how much magnetic flux passes through each of its coils
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