While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. The weight has mass 12.5 kg, and is a distance of 28.0 cm from the knee joint. The moment of inertia of the lower leg is 0.900 kg ⋅ m 2 , the muscle force is 1450 N , and its effective perpendicular lever arm is 3.45 cm. Find the magnitude of the angular acceleration α of the weight. α = rad / s 2 How much work W is done if the leg rotates through an angle of 20.0 ° with a constant force exerted by the muscle? W =

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.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

What is part of a line has one endpoint and continues in one direction?