A potential difference is connected across a device with resistance , causing current through the device. Rank the following variations according to the change in the rate at which electrical energy is converted to thermal energy due to the resistance: (a) is doubled with unchanged, (b) is doubled with unchanged, (c) is doubled with unchanged, (d) is doubled with unchanged.

What are similarities and differences between refraction, reflection, diffraction and absorption?

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?