A5.2 g marble is fired vertically upward using a spring gun. the spring must be compressed 8.0 cm if the marble is to just reach a target 13 m above the marble's position on the compressed spring.
(a) what is the change in the gravitational potential energy of the marble-earth system during the 13 m ascent?
j

(b) what is the change in the elastic potential energy of the spring during its launch of the marble?
j

(c) what is the spring constant of the spring?
n/m

What produces a record of seismic waves? richter scale seismogram barometer seismograph

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?

The two metal spheres in the figure are connected by a metal wire with w switch in the middle. initially the switch is open. sphere 1, with the larger radius, i'd given a positive charge. sphere 2, with the smaller radius, is neutral. then the switch is closed. afterward, sphere 1 has charge q1, is at potential v1 and the electric field strength at its surface is e1. the values for sphere 2 are q2, v2, and e2. a. is v1 < ,> , or = to v2? explain. b. is q2 < , > , or = explain? c. is e1 < ,> ,or = to e2? explain?