The American physical chemist Gilbert Newton Lewis(1875–1946) proposed a unit of time called the “jiffy.” Accordingto Lewis, 1 jiffy = the time it takes light to travel one centimeter.(a) If you perform a task in a jiffy, how much time has it taken inseconds? (b) How many jiffys are in one minute? (Use the fact thatthe speed of light is approximately 2.9979 * 108m>s.)

Five clocks are being tested in a laboratory. Exactly at noon, as determined by the WWV time signal, on successive days of a week the clocks read as in the following table. Rank the five clocks according to their relative value as good timekeepers, best to worst. Give the number of the correct clock in each case. Which clock is (a) the best timekeeper? (b) the second-best timekeeper? (c) the third-best timekeeper? (d) the fourth-best timekeeper? (e) the worst timekeeper? Clock Sun. Mon. Tues Wed. Thurs. Fi. Sat. A. 12:36:40 12:36:56 12:37:12 12:37:27 12:37:44 1237-59 12:38:14 11:59:59 12:00:02 11:59-57 12:00:07 12:00:02 11:59:56 12:00:03 B 15:50:45 15:51:43 15:52-41 15:5339 15:54:37 15:5535 155633 D 12:03:59 12:0252 1201:45 12:00:38 11:59:31 11:58:24 11:57:17 E 12:03:59 12:02:49 12:0154 12:01:52 1201:32 1201:22 1201:12 (a) (b) (c) (d) (e) MacBook Pro G Search or type URL @ 23 $ % & 2 3 4 5 6 7 9 Y P W F G H K C V N * 00

A Motor cycle is traveling at a speed of 42 m/s. (a) What is its speed in kilometers per hour? (b) Is itexceeding the 80 km/h speed limit?

A surveyor needs to find the distance across a straight river. Markers are set up at points A and B on opposite sides of the river (see diagram), and at point CC that is 290 feet from B, the angle C is measured and found to be 45∘19.8′You may assume angle B is a right angle. The distance from A to B is  feet.