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A geiger counter registers a count rate of 4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute. what is the half-life of the radiosotope?
An accident in a laboratory results in a room beingcontaminated by a radiosotope with a half-life of 3 days. if the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe toenter?
An automobile with a mass of 2250 slugs is driven around a circular curve, What is the centripetal force on the car
The paths of a golf ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 39.86 m, y = 16.41 m, and t = 2.68 s.
A position vector in the first quadrant has an x component of 8 m and a magnitude of 10 m. What is the value of its y component?
A 65.0 kg skier initially at rest begins to slide down at a 10.0 degree slope. how fast will the skier be going at the end of the hill
A horizontal laser beam of wavelength 632.8 nm has a circular cross section 2.00 mm in diameter. Find the required width of the aperture
A current of 0.80A flows through a copper wire 0.50mm in diameter, How long is the wire in km
A uniform magnetic field of magnitude 1.00 T is directed perpendicular to the plane of a rectangular loop having dimensions 8.1 cm by 10 cm
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
Inside a cart that is accelerating horizontally at acceleration ~a, there is a block of mass M connected to two light springs of force constants k1 and k2
q1. a 280 block on a 50.0 -long string swings in a circle on a horizontal frictionless table at 80.0.what is the speed
In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth, How much work did Arfeuille do on the object
RLC alternating current circuit with a 25 ohm resistor, What is the average power when operating at twice the resonant frequency
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