Q1. Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses?
Q2. Scientists are working on a new technique to kill cancer cells by zapping them with ultrahigh-energy (in the range of 10^12W) pulse of light that last for an extremely short time (a few nanoseconds). These short pulses scramble the interior of a cell without causing it to explode, as long pulses would do. We can model a typical such cell as a disk 5.0 micrometer in diameter, with the pulse lasting 4.0ns with an average power of 2.0x10^12W. We will suppose that the energy is spread uniformly over the faces of 100 cells for each pulse.
a). How much energy is given to the cell during this pulse?
b). what is an intensity (in W/m^2) delivered to the cell?
c). what are the maximum values of the electric and magnetic fields in pulse?