Which of the following elements contained in your body is NOT formed in the cores of stars during thermonuclear fusion?
A) hydrogen
B) carbon
C) calcium
D) iron
E) aluminum
A
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Jupiter's Great Red Spot is a low-pressure storm, like a hurricane on Earth
Indicate whether the statement is true or false
According to the consensus among those scientists who have studied the question, what is the scientific status of the notion that Earth is now or was in the past visited by extraterrestrial life?
A) Although extraterrestrial life is theoretically plausible, and there is observational evidence for it, most scientists still will not accept the conclusion that we have been visited because it seems too unconventional or "kooky." B) Extraterrestrial life is theoretically plausible, and there is real observational evidence for it, which is why most scientists believe that we have been visited. C) Although there is no real evidence that Earth has been visited by extraterrestrials, extraterrestrial life is theoretically plausible. D) Extraterrestrial life is implausible on general theoretical grounds, and there is no real evidence that Earth has been visited by extraterrestrials. E) Although extraterrestrial life is implausible on general theoretical grounds, there is observational evidence for it.
How will the Laser Interferometer Gravitational-Wave Observatory (LIGO) and the Laser Interferometer Space Antenna (LISA) observe gravitational waves?
a. They will detect vibrations in very long solid metal cylinders. b. They will use laser light to detect tiny changes in the distance between mirrors placed far away from each other. c. They will measure the force on precision masses at the ends of long tunnels from a large moving mass in the central building. d. They will measure the changes in the attraction between two masses as one rotates past the other suspended from a thin metal wire. e. They will measure changes in frequency of two masses swinging past each other.
Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?
A. 9.8 m/s2
B. –9.8 m/s2
C. 0 < 
< 9.8 m/s2
D. 0
E. Other (specify)