There is new evidence that water has flowed as mud on Mars in recent times
Indicate whether the statement is true or false
TRUE
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How does a 12-month lunar calendar differ from our 12-month solar calendar?
A) It has about 11 fewer days. B) It does not have seasons. C) Its new year always occurs in February instead of on January 1. D) It uses a 23-hour rather than a 24-hour day.
Two stars have the same absolute magnitude, but one lies twice as far from Earth as the other. It will appear half as bright
Indicate whether the statement is true or false
A laser beam passes through a thin slit. When the pattern is viewed on a screen 1.25 m past the slit, you observe that the fifth-order dark fringes occur at ±2.41 cm from the central bright fringe
The entire experiment is now performed within a liquid, and you observe that each of the fifth-order dark fringes is 0.790 cm closer to the central fringe than it was in air. What is the index of refraction of this liquid? A) 1.33 B) 1.40 C) 1.49 D) 1.62 E) 3.05
An object of mass m is on the surface of the Earth. The distance to the Sun and the Moon are dS and dM, and the masses of the Sun and Moon are MS and MM. What is the ratio of the gravitational force from the Sun to that of the Moon on the object?
a. MSMM /dSdM b. MSMM /d2Sd2M c. MSd2M /MMd2M d. MMd2S /MSd2M