After an electron has been accelerated through a potential difference of 0.15 kV,
what is its de Broglie wavelength? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 0.10 nm
B) 1.0 nm
C) 1.0 mm
D) 1.0 cm
A
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A walker walks 30 m from the origin toward the EAST to point A. She then walks from point A 20 m more toward the EAST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST. B. 30 m toward the WEST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 10 m toward the WEST.
A wheel that is rotating at 33.3 rad/s is given an angular acceleration of 2.15 rad/s2. Through what angle has the wheel turned when its angular speed reaches 72.0 rad/s?
A) 83.2 rad B) 316 rad C) 697 rad D) 66.8 rad E) 948 rad
Who first used RR Lyrae variable stars to determine distances in our Milky Way galaxy?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley
The distance across the ocean over which a steady wind blows is the: