What is the smallest particle into which an element can be divided and still be the same substance? O electron
O neutron
O atom
O proton

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What is a carrier wave and how does it affect what you hear on the radio

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.