Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U-235 sample to decay

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

Which position represents spring in the southern hemisphere? a) b) c) d)

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland