A planet has mass M = 8.00 × 10^23 kg. The centripetal acceleration of an orbiting space station is equal to the gravitational acceleration on Earth's surface. What is the speed of the space station? (G = 6.67 × 10^–11 m3·kg–1·s–2)
a. 7.30 × 10^6 m/s
b. 5.34 × 10^13 m/s
c. 1.10 × 10^17 m/s
d. 1.20 × 10^34 m/s
a
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According to our theory of solar system formation, what are asteroids and comets?
A) leftover planetesimals that never accreted into planets B) the shattered remains of collisions between planets C) chunks of rock or ice that condensed after the planets and moons finished forming D) chunks of rock or ice that were expelled from planets by volcanoes
The position of a mass that is oscillating on a spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. What is the period of this motion?
A) 1.74 s B) 1.15 s C) 1.32 s D) 0.869 s E) 0.314 s
Which of the following devices use lasers?
a. DVD players b. fiber optics communication systems c. photocopiers d. UPC price scanners
A projectile is launched at an angle ? above the horizontal. Three seconds later the projectile is moving the same angle ? below the horizontal. Which of the following (actual values with units, not just algebraic symbols) can be found from the information given?
a. the initial vertical component of the projectile's velocity b. the initial horizontal component of the projectile's velocity c. the initial magnitude of the velocity d. None of the above since at least one of the above must be given to find the other two values.