Four machines (A-D) push four identical heavy boxes 100 m along a track. According to the graph, which machine pushed with the least force? Machine A Power (W) Machine B Machine C Machine D Velocity (m/s) O All pushed with the same force. 26 27 28 29 30 31 32 33 34 35 NextYou may use a calculator. What is the equivalent resistance of a parallel circuit with a 3.0 f resistor, a 5.0 $2 resistor, and 1.0 $2 resistor? O 0.65 12 0.83 02 O 1502 0 10 0 26 27 28 29 30 31 32 33 34 35 NePhysics - Part 1 You may use a calculator. Speed of Sound Waves in Various Mediums A 3.0 m solid copper rod is at 25"C. How long would it take sound to Medium move through the rod from one end to another? m/s 8.4 x 10 4 s Air (0* C) 331 Air (20 C) 343 O 2.9 x 10 s Helium (0" C) 972 O 4.2 x 10 s Water 25" C) 1.493 O 4.5 x 10 3 s Seawater (25 C) 1,533 Copper (25 C) 3,560 Iron (25. C) 5,130 4 26 27 28 29 30 31 32 33 34 35 FinishAccording to the table shown, which material will transfer the most + electrons when rubbed against a rubber rod? Increasingly Increasingly positive negative wool cotton O fur O silk Rubber Cotton Wool Silk Fur 26 27 28 29 30 31 32 33 34 35 NextA 0.200 kg block of a substance requires 3.59 kJ of heat to raise its temperature by 20.0 K. What is the specific heat of the substance? 130 J/(kg . K) 385 J/(kg . K) 897 J/ (kg . K) 2,020 J/(kg . K) 26 27 28 29 30 31 32 33 34 35 Next