What type or radiation is emitted when polonium-212 forms lead-208? a. gamma radiation b. positron c. an alpha particle d. a beta particle

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

If a balloon is taken outside on a very cold day, what will occur?