Two springs with spring constants k1 and k2 are connected together. with mass m1 attached, the springs have
lengths d1 and d2. increasing the pull mass to m2 stretches the
springs a distance x1 and x2 for a total stretch of x. derive an
equation for the effective force constant ke of the two spring in
series. (hint: the stretching force f is the same for both springs.)
what is ke when k1 = k2? does the k of a spring depend on the
length of the coiled spring?

How many neutrons does a atom of cobalt have?

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.