Gr7_Sci_U04_USA_FY21 Question: 1-2
Jane believes that plate tectonics is a theory, and Mario believes it is a law. Which of the following best supports Jane's argument
Plate tectonic theory specifies how fast the plates may have moved in the past.
Plate tectonic theory gives a precise prediction of the direction of plate tectonics.
O O O
Plate tectonic theory explains why the outer layers of the Earth move and change.
Plate tectonic theory provides a means to calculate exactly where and when the plates will move

What is the role of the ocular lens?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

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?