My electric razor operates on 120. v and requires 3.0 Amperes. How much current comes out after delivering 360. watts of power?
A) 40. A
B) 0. A
C) 3.0 A
D) 1.2 A
E) 2.4 A
C
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The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
Which one of the following is not a surface feature
of the Moon? a) a maria. b) A ray. c) A node. d) A rill.
Compton Scattering: A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.6110 nm, what is the kinetic energy of the recoiling electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.5 × 10-18 J B. 1.9 × 10-18 J C. 3.1 × 10-18 J D. 4.3 × 10-18 J E. 5.2 × 10-18 J