SAQ 4.3 A horizontal wire carries a current l1= 80 A dc. A second parallel wire 20 cm below it must
carry how much current I2 so that it doesn't fall due to gravity? The lower wire has a mass of
0.12 g per meter of length.

In physics the desire of an object to keep doing what it is doing is termed?

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?