Supposing the half-life of element X to be 1 year, if you have a 100 gram sample of X, how much of element X would be left after 4 years? (Do not use significant digits in answering this question.) 75 g
50 g
25 g
6.25 g

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.