Unlike Jupiter and Saturn, at Uranus and Neptune the ________ rotates the slowest
Fill in the blank(s) with correct word
equator
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An atom can be excited into a higher energy state by absorbing a __________
Fill in the blank(s) with correct word
Which of the following people reorganized the spectral classification scheme into the one we use today and personally classified over 400,000 stars?
A) Annie Jump Cannon B) Williamina Fleming C) Cecilia Payne-Gaposchkin D) Henry Draper E) Edward Pickering
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?
A. 3.2 kN B. 8.1 kN C. 4.9 kN D. 1.7 kN E. 5.3 kN
Which of the following describes a major challenge of interstellar travel at near light speed?
A) Supernova explosions could destroy spaceships passing nearby. B) Asteroid fields floating in interstellar space will present a severe navigational challenge. C) Any interstellar journey will take much longer than the lives of the crew members. D) Time dilation will slow the heartbeats of the crew to a dangerously low rate. E) Atoms and ions in interstellar space will hit the spacecraft like a flood of dangerous cosmic rays.