MCAT_Review_Giambatista.pdf

Physics Questions Translational Motion 1. Which of the following numbers is given to four significant figures? a. 0.00020 b. 0.0020 c. 2.000 d. 2000 2. An auto travels at the rate of 25 km/h for 4.0 minutes, then at 50 km/h for 8.0 minutes, and finally at 20 km/h for 2.0 minutes. Find (a) the total distance covered in km and (b) the average speed for the complete trip in m/s. a. (a) 540 km, (b) 642 m/s b. (a) 12.5 km, (b) 38.6 m/s c. (a) 10.7 km, (b) 126 m/s d. (a) 9.0 km, (b) 10.7 m/s 3. A body with initial velocity 8.0 m/s moves along a straight line with constant acceleration and travels 640 m in 40 s. For the 40 s interval, find (a) the average velocity, (b) the final velocity, and (c) the acceleration. a. (a) 4.0 m/s, (b) 8.0 m/s, (c) 0.6 m/s2 b. (a) 24 m/s, (b) 16 m/s, (c) 0.20 m/s2 c. (a) 16 m/s, (b) 24 m/s, (c) 0.40 m/s2 d. (a) 0.4 m/s, (b) 160 m/s, (c) 16 m/s2 4. A bottle dropped from a balloon reaches the ground in 20 s. Determine the height of the balloon if (a) it was at rest in the air and (b) it was ascending with a speed of 50 m/s when the bottle was dropped. a. (a) 98 km, (b) 2960 km b. (a) 196 km, (b) 1960 km c. (a) 0.49 km, (b) 1000 km d. (a) 2.0 km, (b) 0.96 km 5. A bug starts at point A, crawls 8.0 cm east, then 5.0 cm south, 3.0 cm west, and 4.0 cm north to point B. (a) How far north and east is B from A? (b) Find the displacement from A to B both graphically and algebraically. a. (a) 5.0 cm - EAST, 1.0 cm - SOUTH, (b) 5.10 cm - 11.3° SOUTH OF EAST b. (a) 11.0 cm - EAST, 1.0 cm - SOUTH, (b) 11.1 cm - 5.2° SOUTH OF EAST c. (a) 5.0 cm - EAST, 1.0 cm - NORTH, (b) 5.1 cm - 11.3° NORTH OF EAST d. (a) 5.0 cm - EAST, 9.0 cm - SOUTH, (b) 10.1 cm - 60.9° SOUTH OF EAST 6. Compute algebraically the resultant of the following coplanar forces: 100 N at 30 degrees, 141.4 N at 45°, and 100 N at 240°. Check your result graphically. a. 0.341 kN at 0° b. 0.335 kN at 45° c. 0.15 kN at 65° d. 0.15 kN a