Determine the direction and magnitude electric field at the point P. The charges are separated by a distance 2a, and point P is distance x from the midpoint between the two charges. Express your answer in terms of Q, x, a and k.​

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Why does the liquid rise up through the dip tube when the valve is open

Which of the following best explains what happens when the kinetic energy of particles in a liquid state decreases?