Lay a pencil on a flat surface. This will serve as the fulcrum for your experiment. 2. Set the center of the ruler on the pencil so that the length of the ruler is perpendicular to the pencil 3. Place stack of 3 pennies onto one end of the ruler. Record the distance from the center of the ruler that these pennies were placed. The distance is from the center of the stack of pennies to the center of the ruler. 4. Predict the distance from the fulcrum that you must place the center of mass of 4, 5, 6, 7 and 8 penny stacks to balance the ruler. You wi

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?