Why are astronauts weightless in the Space Station? You may find it helpful to watch the video "Newton's Laws of Motion."
A) because the Space Station is constantly in free-fall around the Earth
B) because the Space Station is traveling so fast
C) because there is no gravity in space
D) because the Space Station is moving at constant velocity
A) because the Space Station is constantly in free-fall around the Earth
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What causes the radio pulses of a pulsar?
A) The star vibrates. B) As the star spins, beams of radio radiation sweep through space. If one of the beams crosses Earth, we observe a pulse. C) The star undergoes periodic explosions of nuclear fusion that generate radio emission. D) The star's orbiting companion periodically eclipses the radio waves emitted by the main pulsar. E) A black hole near the star absorbs energy and re-emits it as radio waves.
The electric field in the wires of an ac circuit
A) changes via the inverse square law. B) changes direction with time. C) remains relatively constant. D) is nonexistent. E) none of the above
Suppose a 0.74-kg mass on a spring that has been compressed 0.100 m has elastic potential energy of 1.20 J. What is the spring constant?
a. 178 N/m b. 320 N/m c. 240 N/m d. 24.0 N/m e. 74.0 N/m
Rank the magnitudes of the forces exerted on the following particles from largest to smallest. In your ranking, display any cases of equality
(a) an electron moving at 1 Mm/s perpendicular to a 1-mT magnetic field (b) an electron moving at 1 Mm/s parallel to a 1-mT magnetic field (c) an electron moving at 2 Mm/s perpendicular to a 1-mT magnetic field (d) a proton moving at 1 Mm/s perpendicular to a 1-mT magnetic field (e) a proton moving at 1 Mm/s at a 458 angle to a 1-mT magnetic field
1.d > a = c > b > f 2.a > c > d > b = c 3.c > a = d > e > b 4.b > f > c > d > a 5.b > c > a > f > d