Two charges, each of charge q, are separated by a distance d. The distance between the charges is doubled. If the original potential energy of the arrangement was 40 mJ, by how much does the potential energy change when the charges are moved to the increased distance?
a. It decreases by more than 20 mJ.
c. More information is needed. b. It decreases by less than 20 mJ
d. It decreases by 20 mJ.
Question 2
A railroad freight car, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 60,000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15,000-kg car is preserved in the two-coupled cars after collision?
a. 20
c. 86
b. 23
d. 100
Global positioning systems determine latitude, longitude, and altitude by measuring the distance fro
How a catalyst circumvents unfavorable charge development during cleavage of an amide
Major trunk lines carrying long-distance traffic crisscrossed the area east of the Mississippi. The
Air-conditioning refrigerant oil must be kept separated from other oils because it contains traces ...
Ileal conduit. A segment of ileum is separated from the small intestine and formed into a tubular ...
The path of a race car is shown. What is the straight distance from the start to the finish to ...