Question

1. Two neutral spheres are attached to two identical springs and separated by 8.0 cm. When a charge of +2.5 x 10-6 C is placed on each sphere, the distance between the spheres doubles. The springs are then oriented vertically and a 560 g mass is placed on them. What compression would these springs experience? Assume both springs would share the force of the mass equally.

2. In a physics experiment designed to analyze collisions between electrons and π0 mesons (pronounced pion, with a mass of 2.41 × 10-28 kg), 202 nm light incident on a metal surface of work function 5.65 eV is used to eject electrons. In one of the electron-pion collisions, a new particle is formed. What is the velocity of this new particle assuming no mass is lost, momentum is conserved and ignoring relativistic effects?

3. To measure the mass of certain small insects, the thickness of the insect, or its radial, is compared to the insect’s radial density. For a certain insect, with a radial density of 210 g/mm, the insect’s body is placed between the two pieces of glass of an air wedge. When light of wavelength 380 nm is reflected from the wedge 80 alternating bright and dark fringes appear. If the insect has a jumping force of 3.5 N which it applies for 1.5 ms, what is the maximum jumping range of an insect of this size in ideal conditions? Assume gravity does not act until after the jump is completed.

Answer 1

Here we apply Coulomb's law of electrostatics and hook's law. Also we apply equilibrium condition.