O 3003
4 taktai
2 g masės kolibris gali skristi 50 ms greičiu. Kokia tuo metu jo kinetinė
energija?
100)
25 J
103
2.53
Krepšinio kamuolys laisvai krinta iš taško A. Kuriame trajektorijos taske 2 taškai
kamuolio potencinė energija yra didžiausia? Oro pasipriešinimo

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?