Which molecule has not yet been detected in the atmospheres of exoplanets?
A) Methane
B) Carbon dioxide
C) Oxygen
D) Water
C
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A negative charge, if free, tries to move
A) from high potential to low potential. B) from low potential to high potential. C) toward infinity. D) away from infinity. E) in the direction of the electric field.
What conditions are required for a solar eclipse?
a) the phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with the earth and the Sun b)the phase of the Moon must be full, and the nodes of Moon's orbit must be nearly aligned with the earth and the Sun c)the phase of the Moon must third quarter, and the Moon's orbital plane must lie in the plane of the ecliptic
A light beam traveling horizontally enters a hole in the side of a laboratory on planet X
The laboratory is 40.0 m wide. If the light beam hits the far wall a distance 0.20 mm below the height it entered the laboratory, what is the acceleration of gravity on planet X? A) 2.25 × 1010 m/s2 B) 8.00 × 106 m/s2 C) 9.81 m/s2 D) 4.50 × 105 m/s2 E) 3.75 × 103 m/s2
This image shows Pluto photographed by the New Horizons spacecraft in 2015. What did scientists find most surprising when they saw this image?
A) the smooth areas and other features suggesting relatively recent geological activity B) the round shape C) the presence of numerous impact craters D) the fact that the entire face shown is sunlit in this photo