1. Julie sees commercials for antibacterial products that claim to kill almost all the bacteria in the area that has been treated with the product. Julie asks, 'How effective is antibacterial cleaner in
preventing the growth of bacteria?" She sets up an experiment in order to study the effectiveness
of antibacterial products. Julie hypothesizes that the antibacterial soap will prevent bacterial
growth. In her experiment, she follows the following procedure.

Identify the experimental variable and three control variables in the experiment.
DEPENDENT VARIABLE:
DEPENDENT VARIABLE:
3 CONTROLLED VARIABLES:

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?

How many neutrons does plutonium -196 with an atomic number of 78.

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?