1. In Sèvres, France, a platinum-iridium cylinder is kept in a vacuum under lock and
key. It is the standard kilogram with mass
1.0000 kg. Imagine you were granted the
opportunity to experiment with this special
mass, and obtained the following data:
1.32 kg, 1.33 kg, and 1.31 kg. Describe your
results in terms of precision and accuracy.

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?