Describe four effects that helped to clear the solar nebula
What will be an ideal response?
1 . Radiation pressure: light streaming from the Sun's photosphere pushed against the particles of the solar nebula. Large bits of matter like planetesimals and planets were not affected, but low-mass specks of dust and individual atoms and molecules were pushed outward and eventually driven from the system.
2 . Solar wind: the flow of ionized hydrogen and other atoms away from the Sun's upper atmosphere. The strong surging wind from the young Sun may have helped push dust and gas out of the nebula.
3 . Sweeping up of space debris by the planets.
4 . Ejection of material from the Solar System by close encounters with planets. If a small object such as a planetesimal passes close to a planet, the small object's path will be affected by the planet's gravitational field. In some cases, the small object can gain energy from the planet's motion and be thrown out of the Solar System.
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Plane Mirrors: David stands 2.5 m in front of a plane mirror.(a) How far from David is his image in the mirror?(b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?(c) If David is 180 cm tall, how tall is his image in the mirror?
What will be an ideal response?
A hydrogen atom is in its n = 2 excited state when its electron absorbs a photon of energy 8.5 eV. What is the energy of the resulting free electron?
The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 5.1 eV B) 6.6 eV C) 6.9 eV D) 7.6 eV
Write the equation of a wave, traveling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec.
A. y = 0.02 sin [880?(x/330 ?t)] B. y = 0.02 cos [880?x/330 ? 440t] C. y = 0.02 sin [880?(x/330 + t)] D. y = 0.02 sin [2?(x/330 + 440t)] E. y = 0.02 cos [2?(x/330 + 440t)]
Answer the following statement(s) true (T) or false (F)
1.When a baseball pitcher throws a curveball, he or she puts top-spin on the ball. This causes the ball to interact with the passing air in such a way as to make the air push the ball downward perpendicular to the ball’s velocity. (This causes the ball to dive sharply as it approaches the plate, making it quite difficult to hit.) We would classify this force as a “lift” force on the ball.