An electric motor must have which of the following in order to work?
galvanometer, power source, secondary coil, or primary coil

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.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?