Rwo identical negatively charged spheres. A and B. having charges of the same nagnitude, are placed 0,5 m apart in vacuum. The magnitude of the electrostatic force
hat one sphere exerts on the other is 1,44 x 10'N
0.5 m
$100
B.
А
State Coulomb's law in words.
2.1
2.2
Calculate the:
2.2.1
O
Magnitude of the charge on each sphere
Excess number of electrons on sphere B
2.2.2​

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

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.

In a good thermo flask the main cause of heat loss is