Answers: 1
Physics, 22.06.2019 02:00
Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.
Answers: 2
Physics, 22.06.2019 07:10
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?
Answers: 2
Physics, 22.06.2019 17:50
Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?
Answers: 1
There are two lenses having focal length of - 25 cm and + 20 cm. What are the nature of the lenses....
Mathematics, 19.02.2021 21:10
Mathematics, 19.02.2021 21:10
History, 19.02.2021 21:10
Physics, 19.02.2021 21:10
Social Studies, 19.02.2021 21:10
Mathematics, 19.02.2021 21:10
Social Studies, 19.02.2021 21:10
Mathematics, 19.02.2021 21:10
Mathematics, 19.02.2021 21:10
History, 19.02.2021 21:10
English, 19.02.2021 21:10
Spanish, 19.02.2021 21:10
Mathematics, 19.02.2021 21:10
History, 19.02.2021 21:10