Given that a force vector extends from the origin to (120 N, -60.0 N), find the direction of the vector referenced to the positive x-axis.
A. 116
B. 26.6
C. -26.6
D. 122
C. -26.6
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An earthquake emits both P-waves and S-waves that travel at different speeds through the Earth. A P-wave travels at 9 000 m/s and an S-wave at 4 000 m/s. If P-waves are received at a seismic station 34.0 s before an S-wave arrives, how far is the station from the earthquake center?
a. 1.22E+5 m b. 4.90E+5 m c. 2.45E+5 m d. 9.42E+4 m e. 1.70E+5 m
Pulsars:
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
When we see a meteor shower, it means that
A) the solar wind is unusually strong. B) an Earth-approaching asteroid has recently come very close to our planet. C) you should duck and run for cover to avoid being blasted on the head by a rock from space. D) Earth is crossing the orbit of a comet.
An electron microscope operates with electrons of kinetic energy 58 keV. What is the wavelength of these electrons? Assume this speed is not relativistic. (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and me = 9.11 × 10^?31 kg)
a. 3.57E–20 m b. 7.69E–13 m c. 5.10E–12 m d. 2.28E–10 m e. 1.03E–11 m