Examine the false statement. scientists can directly observe the half-life of all radioactive elements. what option rewords the statement so that it is true? select all that apply. scientists can calculate the rate of nuclear decay for all radioactive elements using half-life. scientists can calculate the half-life of all radioactive elements using the rate of nuclear decay. scientists cannot directly observe or calculate the rate of nuclear decay for all radioactive elements. scientists can directly observe the rate of nuclear decay for all radioactive elements.

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.

When you notice something that is happening, what are you making? a. an observation b. a law c. a theory d. an experiment

How much heat is needed to raise the temperature of 5g of water by 16°c?