Three point mass particles are located in a plane: 4.34 kg located at the origin, 8.029 kg at [(6.44 cm),(12.88 cm)], and 2.9078 kg at [(15.8424 cm),(0 cm)]. How far is the center of mass of the three particles from the origin? Answer in units of cm.

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly

Which atomic model was proposed as a result of j. j. thomson’s work?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.