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The radioactive isotope 241Am, with a half-life of 432 years, is the active element in many smoke detectors. Assume such a detector will no longer function if the activity of the isotope it contains drops below 1/525 of its initial activity. How long will this smoke detector work?
a charge of 35.0 nc is placed in a uniform electric field that is directed vertically upward and that has a magnitude
Although both stars probably formed from the same clump of gas, more massive one must have had its birth slowed so that it became a key -sequence star millions of years later than its less massive companion.
when it rains water vapor in the air condenses into liquid water and energy is released.a how much energy is released
A 68.4-kg skier coasts up a snow-covered hill that makes an angle of 25.5 ° with the horizontal. TWhat is the magnitude of the kinetic frictional force
Suppose your lab partner has a height L of 170 cm (5 ft, 7 in) and a weight w of 680 N (153 lb). find the distance of your lab partner's center of gravity from the left end of the board
Block Ahas mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring S between them, What is the final speed of block A
an infinite line charge of uniform linear charge density -1.1 cm lies parallel to the y axis at x -1 m. a point
Two rockets, A and B, approach the earth from opposite directions at speed 0.60c. What is the length of rocket A as measured by the crew of rocket B
A bat at rest sends out ultrasonic sound waves at 53.5kHz and receives them returned from an object moving directly away from it, What is the received sound frequency
A telescope consists of a mirror with radius of curvature 6.5 m and an eyepiece. If an astronomer would like the telescope to have a magnification of 114, what focal length eyepiece should he use?
A window of a car is found to be covered with 0.6cm of ice. If the area of the window is 1 m2, and the ice is at -12 degrees Celsius, what is the minimum heat required to melt all the ice
A very long, straight wire carries a current of 16.3 A out of the screen. Find the magnitude of the force on the electron if it is moving upward
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