Help? the first line is supposed to say "all _ has heat"
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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.

Positrons are spontaneously emitted from the nuclei of

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot