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A geiger counter registers a count rate of4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute.what is thehalf-life of the radiosotope?
An accident in a laboratory results in a room being contaminated by a radiosotope with a half-life of 3 days. ifthe radiation is measured to be eight times the maximum permissiblelevel, how much time must elapse before the room is safe to enter?
Suppose that protons are fired towards the large flat side of a charged conducting plate. How long does it take for the particles to hit the plate
a 87.40 kg hiker has ascended to a height of 1867 m in the process of climbing mt. washington. by what percent has the hikers weight changed
A “75 Watt” light bulb uses an average power of 75W when connected to an rms voltage of 120V. What is the resistance of the light bulb? What is the maximum current in the light bulb? What is the maximum power used by the bulb at any given instant of ..
Determine the magnitude and coordinate direction angles for the resultant force of the combination of the two forces shown.
A projectile of mass 350-g is accelerated from rest at 8.25 m/s2 for 3.5s. Calculate how fast the ball and embedded projectile are after the collision
In April 1974, Steve Prefontaine completed a 10000m race in a time of 1663.6 s. Suppose \"Pre\" was at the 8550m mark at a time of 1500 s. calculate the acceleration that he had
A heavy piece of hanging sculpture is suspended by a 146.0 cm long, 8.03 gm wire. When the wind blows hard, wire hums at its fundamental frequency of 113.0 Hz. What is the mass of the sculpture (in kg) assume that the local acceleration due to gravit..
Block 1, of mass = 9.70 , moves along a frictionless air track with speed = 19.0 . It collides with block 2, of mass = 15.0 , which was initially at rest. The blocks stick together after the collision. Find the magnitude of the total initial momentum..
An eagle is flying horizontally at 6.2 m/swith a fish in its claws. It accidentally drops the fish. How much time does it take before the fish's speed doubles?
Its walls are equally high and 11 m apart. He takes off by driving a motorcycle up a short ramp sloped at an angle of 24°. Illustrate what minimum speed must he have in order to clear the canyon?
Dave Johnson, the bronze medalist at the 1992 Olympic decathlon in Barcelona, How far does his center of mass move up as he makes the jump
A space traveller weighs herself on Earth, at a location where the acceleration due to gravity is 9.82 m/s2, and finds a value of 571 N. What is the traveller\'s mass on the planet
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