The image shows copper wire coiled around an iron nail and connected to a battery to create an electromagnet. which factors determine the strength of this electromagnet? a. the voltage of the battery and the size of the switch b. the number of coils of wire around the nail and the length of the wire in the circuit c. the size of the nail and the size of the switch. d. the amount of electric current and the number of wire coils around the nail

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

What is the role of lenses in microscopy?