What is the gravitational potential energy of a 1.3 kg book that is 473 meters above the ground? (Take in account for gravity, g = 9.8 m/s2)
2 points

Can anybody me with this? ? (picture included.)

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?

What is the coefficient of kinetic friction μk between the block and the tabletop?