An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the pitch of the resulting helical path?
a. 13 mm
b. 32 mm
c. 24 mm
d. 18 mm
e. 3.8 mm
d
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In the proton-proton chain
a. no neutrinos are produced. b. energy is released because a helium nucleus has a greater mass than a hydrogen nucleus. c. no photons are produced. d. carbon serves as a catalyst for the nuclear reaction. e. energy is produced in the form of gamma rays and the velocity of the created nuclei.
This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. During which stage is the star's energy supplied primarily by gravitational contraction?
A) Stage ii B) Stage iii C) Stage v D) Stage vi E) Stage viii
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a ? m/s2, v ? m/s, x ? m , t ? s)
A) x = v/t B) v = 2ax C) t2 = x/a D) x2 = 2av E) x = a t
A 0.67 ?F parallel plate capacitor has air between the plates with a separation of 0.33 mm
(a) What is the plate area? (b) What charge is on the plates when connected to a 3.0 volt battery?