Ahorizontal spring with stiffness 0.4 n/m has a relaxed length of 11 cm (0.11 m). a mass of 21 grams (0.021 kg) is attached and you stretch the spring to a total length of 27 cm (0.27 m). the mass is then released from rest. what is the speed of the mass at the moment when the spring returns to its relaxed length of 11 cm (0.11 m)?

We will use a video to study faraday’s law of electromagnetic induction by analyzing the induction that occurs due a coil of copper wire sliding along an air track that passes through an external magnetic field. specifically, we will: examine some of the main principles behind faraday’s law. apply lenz’s law to determine the direction of the induced emf. take measurements of the induced emf from the voltmeter as the coil passes into and out of the external magnetic field. use the horizontal scale provided to determine the speed of the coil. calculate the magnetic field induced in the coil as it passes into and out of the external magnetic field.