Which one of the following is a double-displacement reaction?
a.) 2li (s) + znso4 (aq) → li2so4 (aq) + zn (s)
b.) hno3 (aq) + koh (aq) → h2o (l) + kno3 (aq)
c.) fe (s) + cuso4 (aq) → feso4 (aq) + cu (s)
d.) 2cu (s) + o2 (g) → 2cuo (s)

Describe the path of a ray that approaches a mirror parallel to the principal axis.

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.

When a pair of 10-n forces act on a box of candy, the net force on the box is a 20 n. b about 14 n. c zero. d any of the above depending on the directions of forces.