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) Annie Jump Cannon
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What's the fundamental reason that Mars has so little geological activity compared to Earth?
A) its small size compared to Earth B) its large size compared to the Earth C) its farther distance than Earth to the Sun D) its closer distance than Earth to the Sun E) its rapid rotation compared to the Earth F) its slow rotation compared to the Earth
The switch in the circuit shown in the figure below is closed, and the lightbulb glows steadily. The inductor is a simple air-core solenoid. An iron rod is inserted into the interior of the solenoid, increasing the magnitude of the magnetic field in the solenoid. As the rod is inserted, the brightness of the lightbulb
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these
A current of 4 A exist in the primary coil of a transformer powered with 110 V. What is the power output of the secondary coil?
A) 27.5 W B) 110 W C) 440 W D) 880 W E) not enough information