You create a strain gauge from a straight length of copper wire that is 1.00 cm long and has cross-sectional area of 196 x 10-9 m 2. You carefully attach the strain gauge to an aluminum beam that is 10.0 m long. When the piece of aluminum is stretched, the strain gauge resistance increases 27 x 10-9. Resistivity of copper = 168 x 10-6 m. E of copper = 115 x 109 Pa. How much strain did the aluminum beam undergo?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

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.

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring