What is the half-life of an isotope that decays to 25% of its original activity in 70.8 hours?

You know what type of shape you're in better than anyone else.

A certain type of elementary particle travels at a speed of 2.75Ã108 m/s. at this speed, the average lifetime is measured to be 3.86Ã10â6 s

How do astronomers best learn about distant objects in the universe A. They collect and analyze data from their electromagnetic radiation. B. They analyze rock samples from space probes. C.

Greek philosophers such as Demoncritus and Aristotle had ideas about the composition of matter. For example, Demoncritus believed matter was made of tiny, solid spheres that he called atomos, and Aristotle thought matter was made up of earth, water,

A disc-shaped grindstone with mass 50 kg and diameter 0.52m rotates on frictionless bearings at 850 rev/min. An ax is pushed against the rim (to sharpen it) with a normal force of 160 N. The grindstone subsequently comes to rest in 7.5 seconds.

How long did it take to reload a rifle during the 18th 19 century?

Oil flows upward in the wick of a lantern because of the liquid property called A. meniscusity. B. capillarity. C. density. D. viscosity.

A high-mass star has more "fuel" than a low-mass star. which lives longer? why?

Suppose that, while lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears. you then stand, elevating your eyes by a height h = 1.

Suppose you want to know if the color of peoples hair affects how warm it can keep their heads. describe the skills you would use to conduct an experiment to test your inquiry