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A 0.69-kg tumor is being irradiated by a radioactive source. The tumor receives an absorbed dose of 13 Gy in a time of 960 s. Each disintegration of the radioactive source produces a particle that enters the tumor and delivers an energy of 0.44 MeV. What is the activityN/t(in Bq) of the radioactive source?
If a communications satellite needs to be 36,000 km above theequator, how fast must it travel to remain at that height? How long will the satellite take to orbit the earth
Evaluate the prospects for detecting the three planets (P1, P2 and P3) using Van and Mini, and explain the principles that would be used for their detection by the two missions.
A potential difference of 76 mV exists between the inner and outer surfaces of a cell membrane. The innersurface is negative relative to the outer surface. How much work is required to reject a positive sodium ion (Na+) from the interior of the ce..
An electron is moving at a speed of 1.0 x10^4 m/s in a circular path of radius of 2.1cm inside a solenoid. The magnetic field of the solenoid is perpendicular to the plane of the electron's path. The solenoid has 25 turns per centimeter.
A certain kind of glass has nblue = 1.560 for blue light and nred = 1.510 for red light. what is the angle between the red and blue light inside the glass
A drag racer crosses the finish line doing 216 mi/h and promptly deploys her drag chute, What force must the drag chute exert on the 850 kg car to slow it to 45.2 mi/h in a distance of 161 m
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 240 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring..
A curve of radius 40 m is banked for a design speed of 100 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely create the curve?
a carnot engine operates with an efficiency of 23.0 when the temperature of its cold reservoir is 274 k. assuming that
It has been said that the ground-state energy in the hydrogen atom can be precisely known but the excited states have some uncertainty in their values (an "energy width"). Is this consistent with the uncertainty principle in its energy form? Explai..
An object is dropped from a height 622 km above Earth's surface. What is its initial acceleration in terms ofg, the acceleration constant due to gravity at Earth's surface?
The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed around a circular track on level ground, completing each l..
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