A penny of mass 0.17 kg is placed at the outside edge of a 12'' diameter (or Long Play vinyl) record as shown in the image below. The penny does not slide off but rotates with the record at a constant speed of 0.83 m/s. What is the magnitude of the frictional force acting on the penny, assuming that the coefficient of friction is μ = 0.995? Remember that 1'' = 2.54 cm and give your answer to two decimals.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

What is the equation for electrical work?