5 15 joules of work are done by forces other than gravity in taking an object from a position 3 m above the ground to a position 8 m above the ground What is the change in the gravitational potential energy of the object? A lt decreases by 5 joules B. It increases by 5 joules C. It increases by 11 joules. D. It increases by 15 joules​

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

An atom that has gained or lost electrons is called an _

Why does gravity have a lesser than grater effect on higher altitudes?