A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.6 m/s when at the release point, to what maximum angle will it move in the second half of its swing?
a. 86.3°
b. 32.8°
c. 39.1°
d. 83°
e. 180°
b
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When a hydrogen electron is in its first excited state, its principal quantum number is
a. zero. b. 2. c. –13.60 eV. d. 1.
Most of Earth's seismic activity, volcanism, and mountain building occur along
A) convergent boundaries. B) divergent boundaries. C) plate boundaries. D) transform fault boundaries.
A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200 t) A, where t is measured in s. When t = 2.5 ms, what is the magnitude of the induced electric field at a point which is 4.0 cm from the axis of the solenoid?
a. 9.3 × 10^-3 V/m b. 8.0 × 10^-3 V/m c. 6.7 × 10^-3 V/m d. 5.3 × 10^-3 V/m e. 1.9 × 10^-3 V/m
A submarine must travel how fast (with respect to the water) and be pointed in what direction such that it moves 10. m/s directly Northward (relative to the Earth) if the water moves westward at 5.0 m/s?
What will be an ideal response?