Which of Maxwell's four equations was derived from observations of each of the following:
• bar magnets
• wire loops carrying electrical current
• two different materials being rubbed together
• the effects of a current-carrying wire coil on a nearby coil

Describe the path of a ray that approaches a mirror parallel to the principal axis.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.