Why are nuclear reactions used in power plants?
A nuclear reactions perpetuate themselves without end
B the energy output of nuclear reactions is enormous
C it is important to break down dangerous uranium atoms
D the activation energy required for nuclear reactions is easily achieved

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire