A student is comparing the organelles found in the cells of a milkweed plant and in the cells of a butterfly, using the Venn diagram shown below. Where should the student place the terms “chloroplasts” and “mitochondria”?

A) Chloroplasts should be placed in the section labeled “Butterfly,” while mitochondria should be placed in the section labeled “Both.”

B)Chloroplasts should be placed in the section labeled “Both,” while mitochondria should be placed in the section labeled “Milkweed Plant.”

C)Chloroplasts and mitochondria should be placed in the section labeled “Both.”

D)Chloroplasts should be placed in the section labeled “Milkweed Plant,” while mitochondria should be placed in the section labeled “Both.”

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

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?

What is special about a dc circuit ?