The S.I. fundamental unit for time is the O a. hour year O c. second O d. minute Which of the following is a derived quantity? O a. Mass O b. Length O c. Speed O d. Temperature Clear my choice Name the only fundamental quantity whose unit has a prefix. O a. Mass O b. Length O c. Speed O d. TemperatureName the fundamental quantity whose unit is the name of a scientist. a. Speed b. Length c. Current 0 d. Mass Clear my choice A nearly rectangular track is 150 m long on one side and 50 m long on the shorter side. An athlete runs two complete laps around the track in 100 s. His average velocity is a. 2.0 m/s b. 0.0 m/s c. 8.0 m/s d. 4.0 m/s Convert 8.4 km to m. a. 840 m b. 8400 m c. 0.84 m d. 0.0084 m Taking significant figures into account, calculate the area of a rectangle of length 2 m and width 12 m. a. 14 meters squared b. 28 meters squared c. 20 meters squared d. 24 meters squared Which of the following is NOT a SJ. unit symbol? a kg b S c K d. s The mass of a cell phone is nearest to a. 2 kg b. 1 kg c. 1 g d. 100g The best estimate of the height of this room is a 3m b 1m 0 4m d 2m The time it takes to say \"One thousand and one\What is the meaning of the prefix \"m\"? a. meter b. mega c. milli d. micro The Bahamas stretches for 760 miles. What is this distance in km? (1 mi : 1.609 km; 1 km : 0.6214 mi} a. 1223 km b. 2280 km 0. 472 km d. 760 km It is far easier to push a tricycle than a loaded truck from rest because the tricycle has a. only three wheels b. smaller weight 0. smaller inertia cl. smaller size A point X is 13 m away from a point Y. You walk from X a distance of 5 m due east to a point B, and then 12 m due north to Y. What total distance have you walked? O a. 25 m O b. 17 m O c. 8m O d. 13 m Which of the following is a vector quantity? a. Displacement O b. Distance O c. Mass O d. TimeA point X is 13 m away from a point Y. You walk from X a distance of 5 m due east to a point B, and then 12 m due north to Y. What is the angle of your overall displacement? at 90 degrees due north b 23 degrees anticlockwise from east c. 90 degrees clockwise from east dt 67 degrees anticlockwise from east In a crash in which a car comes to a sudden stop when moving forward, the seat belt at helps the driver have a better control of the steering wheel bt helps to prevent the passenger from moving forward into the windscreen ct helps the car to come to a more gentle stop d. helps to prevent the neck jerking backward (whiplash) The purpose of the headrest in a car is at to prevent the head from ipping backward when the car is hit from the rear hi to prevent the head from ipping backward when the car is hit from the front c to help prevent the head from crashing into the steering wheel when a car crashes to a stop d to provide comfort for the driver's head