Duas partículas eletrizadas com cargas iguais a +25uC estão colocadas a 1,0m uma da outra, no vácuo, onde a constante eletrostática vale 9.10^9 unidades do Sistema Internacional. Não havendo influência de outras cargas, determine: a) a intensidade do campo eletrostático que cada carga cria no ponto P, situado a meia distancia entre elas;

b) a forca resultante que age numa carga de prova de +2,0uC colocada em P.

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

What component of earth’s atmosphere exists entirely as a result of photosynthesis?