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Consider the case of a radioactive element X which decays by electron (beta) emission with a half-life of 4 days to a stable nuclide of element Z. Which of the following statements is CORRECT?
(a) After 8 days the sample will consist of one-fourth element Z and three-fourths element X.
(b) Element Z will weigh exactly the same as element X when decay is complete (weighed to an infinite number of significant figures).
3.00×104 of 300 C steam at a pressure of 20.0 is cooled until it condenses. What is the volume of the liquid water
A sled is initially given a shove up a frictionless 26.0° incline. It reaches a maximum verticalheight 1.45 m higher than where itstarted. What was its initial speed
A student bikes to school by traveling first dN = 1.00miles north, then dW = 0.500miles west, and finally dS = 0.200miles south. what distance db would the bird cover
The figure shows the blade of a chain saw. The rotating sprocket tip at the end of the guide bar has a radius of 0.0343 m. Find the angular speed of the sprocket tip in rev/s
A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 30m high. find the initial speed of the rock
A 1500 kg car moving east at 26 m/s collides with a 1720 kg car moving south at 15 m/s and the two cars stick together.
The maximum angular magnification of a magnifying glass is 12.0 when a person uses it who has a near point that is 25.0 cm from his eyes. Obtain the focal length of the objective
An object 9 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright, 4 cm tall, and located at the 49.0 cm mark of the meterstick.
What are the conditions necessary for life to take root, evolve, and flourish? Where might we find these outside of Earth? The solar system?
express the image distance si of a convex mirror in terms of the object distance so and the radius of curvature of the
Two springs,each w/ spring constant 20N/m,connected parallel, & combination hung vertically one end.10-N weight is suspended from other end of combined spring
A man of mass 45 kg. is standing on a uniform rolling board of length 10 m. and mass (mb = 30 kg). how far does the board retreat
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