What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N
b. 200 N
c. 98 N
d. 49 N
e. Some value other than those given above.
e
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According to quantum field theory, electrons
A) are the quanta of a matter field. B) are the quanta of the electromagnetic field. C) interact by exchanging quarks. D) always come in pairs. E) None of the above.
An astronaut has landed on another planet and conducts an experiment to determine the acceleration of gravity on that planet. She uses a pendulum 0.640 m long and determines that the period of oscillation is 2.60 s
What is the acceleration of gravity on that planet? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2
A proton moving with a speed of 3.20 × 10^5 m/s perpendicular to a uniform magnetic field of 0.0786 T will follow which of the paths described below? (qp = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg)
a. a straight-line path b. a circular path of 4.25 cm radius c. a circular path of 10.9 cm radius d. a circular path of 1.52 cm radius e. a circular path of 54.1 cm radius
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 proton at the position of the electron is
A. ?13.6 V. B. +13.6 V. C. ?27.2 V. D. +27.2 V. E. +5.12 × 109 V.