Protons and electrons possess the same amount of charge, 1.6 × 10−19 C, but the charges have opposite signs. If a proton and an electron are positioned 4.9 × 10−11 m away from each other, what is the electrostatic force between them? A.
−9.6 × 10−8 N
B.
−6.0 × 10−7 N
C.
4.7 × 10−36 N
D.
2.9 × 10−17 N

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a. m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

Hydrogen and helium are both members of?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?