Quả cầu A có điện tích -3,2.10-7C , quả cầu B có điện tích 2,4.10-7C đặt cách nhau 12cm trong chân không . a Vẽ và tính lực tương tác giữa hai quả cầu , lực hút hay đây ? b . Muốn lực tương tác giữa hai quả cầu là 11,52.10-3N thì khoảng cách giữa hai quả cầu là bao nhiêu ? Lấp đầy không gian chứa 2 quả cầu bằng dầu có hằng số điện môi là 2 , tính lực tương tác giữa 2 quả cấu ?

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Daughter element the new element produced along with a decay particle in a nuclear transmutation 2. half-life the substance that decays in a nuclear transmutation 3. parent element the change of one chemical element into another by nuclear decay or radioactive bombardment 4. transmutation the time required for the decay of one-half of the atoms in a sample of radioactive material