An electron is projected out along the + x axis with initial speed of 3*10^6 m/s. it goes 45cm and stops due to a uniform electric field in the region. the magnitude of the field (in v/m) is: a) 114 b) 57 c) 28.5 d) 14.25

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?